CPC · California Plumbing Code

Where are CPC abbreviations and acronyms defined?

If you see an abbreviation in the California Plumbing Code, start in Chapter 2 at **§ 203.0** for code definitions; if it names a state agency, check the Chapter 1 “Legend of Acronyms”; if it’s a standards shorthand, check the referenced‑standards table (Table 1701.1) or the standard itself.

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Last reviewed: July 6, 2026

What the code requires — plain English

The California Plumbing Code places definitions — including the code’s abbreviations and acronyms — in the code’s definitions chapter. The specific location called out in the code matrix is § 203.0 (Chapter 2, “Definitions and Abbreviations”) — that is the primary place to look for code-defined short forms used in the CPC. The CPC also uses a separate “Legend of Acronyms of Adopting State Agencies” in Chapter 1 for agency acronyms and places many abbreviations inside referenced‑standards lists and informational sections.

The single most important rule: look first in Chapter 2 — § 203.0 — for the CPC’s formal list of abbreviations and acronyms (agency acronyms are summarized in the Chapter 1 legend).

Requirements in detail

Where to look, in order

  • Chapter 2 — § 203.0: the code’s "Definitions and Abbreviations" chapter is the primary place the CPC organizes defined terms, abbreviations and acronyms. The matrix and table-of-contents entries in the CPC identify § 203.0 as the section that holds these definitions.
  • Chapter 1 — Legend of Acronyms of Adopting State Agencies: agency acronyms used throughout Title 24 (for example, BSC, DWR, OSHPD) are listed in the Chapter 1 legend and adoption tables (see references to Section 1.2 and related matrix material). Use the Chapter 1 legend when the short form identifies a state adopting agency.
  • Referenced standards / informational sections: many abbreviations (standards acronyms, trade organizations, material abbreviations) appear in the Referenced Standards lists and informational sections (for example, IS tables like IS‑33 and Table 1701.1). If a short form is taken from a referenced standard, that standard or the code’s referenced‑standards table is the authoritative source.

Quick decision table

Decision question Where the CPC defines it (typical) Example(s) Code Reference
Is it a general code term or plumbing technical abbreviation? Chapter 2 — § 203.0 (Definitions and Abbreviations) common code terms, plumbing abbreviations § 203.0 (CPC matrix / Chapter 2)
Is it an adopting‑agency acronym (state agency)? Chapter 1 legend / adoption tables (see Section 1.2 and related matrix) BSC, DWR, OSHPD Chapter 1 legend (see Section 1.2)
Is it an abbreviation used in a referenced standard? The referenced standards table or the standard itself (listed in Table 1701.1 / IS) ASTM, IAPMO, UPC Table 1701.1; IS examples (IS‑33)
Is the term reprinted from another code (Title 19 or another Part)? The matrix/notes flag reprinted CCR/Title 19 text — check the reprint note and the source code CCR/Title 19 reprints CPC matrix / related code notes

How the code treats agency acronyms

  • The CPC’s front‑matter and Chapter 1 explicitly show a Legend of Acronyms of Adopting State Agencies and matrix tables identifying which agencies adopt which sections; consult those for agency short forms and the meaning of agency columns in the adoption matrix.

Exceptions & special cases

  • Some abbreviations do not appear verbatim in § 203.0 because they are defined in a referenced standard (the UPC, ASTM standards, etc.). In those cases the code defers to the referenced standard — check the referenced‑standards list (Table 1701.1 and similar).
  • State agency acronyms used only in the adoption matrix or California amendments may appear only in Chapter 1 or the matrix, not in § 203.0. For example, references to the Department of Water Resources point you to Chapter 1 (Section 1.13) in the CPC front matter.
  • The matrix adoption tables show that different state agencies adopt or amend different subsections (so the presence or meaning of an acronym may vary by Part/Chapter). Always consult the Chapter 1 matrix entries for context.

If the verbatim text of § 203.0 is required, note that the uploaded CPC preview shows the matrix and table references indicating § 203.0 but does not include a full, extractable copy of the § 203.0 wording in the files I searched; you should consult an authoritative copy of the CPC (printed or publisher PDF) to read the exact text of § 203.0.

Common mistakes

  • Looking only at Chapter 2 and missing agency acronyms in Chapter 1 (Legend). Many users expect all short forms in § 203.0; agency acronyms are commonly placed in the Chapter 1 legend instead.
  • Assuming the same acronym always has the same meaning across Title 24 parts — meanings can differ by Part or by referenced standard. Check the code context and the referenced standard.
  • Relying on internet definitions rather than checking the code or the referenced standard. The code and standards are the governing authority for meaning.

Worked example — step‑by‑step concrete scenario

Scenario: you see the short form “DWR” in a CPC amendment about recycled‑water plumbing and need to be sure what it means.

  1. Open the CPC front matter / Chapter 1 and consult the Legend of Acronyms of Adopting State Agencies (Chapter 1). The CPC explicitly lists state agency acronyms in the Chapter 1 legend and points users to specific Section numbers for agency references.
  2. The CPC text and matrix tell you where the Department of Water Resources is referenced (the code notes: “DWR — see Section 1.13 of Chapter 1 of the California Plumbing Code in Part 5 of Title 24”). Follow that pointer to Section 1.13 for the agency context.
  3. If the short form were a technical standard (for example “ASTM” or “UPC”) check the code’s Referenced Standards table (e.g., Table 1701.1 / IS entries) and then the referenced standard itself for the defined abbreviation.

Concrete numbers in the example: Step 1 = check Chapter 1 legend; Step 2 = consult Section 1.13 (DWR pointer); Step 3 = if technical standard, check Table 1701.1 (referenced standards).

Related provisions (CPC locations to check)

  • § 203.0 — Chapter 2: Definitions and Abbreviations (primary location for code definitions).
  • Chapter 1 — Legend of Acronyms of Adopting State Agencies (see Section 1.2 and the Chapter 1 matrix for agency short forms).
  • Section 1.13 — pointers to specific state agencies (example: DWR reference in CPC front matter).
  • Table 1701.1 / Referenced Standards — where standard acronyms and normative references are listed (search these tables if an abbreviation looks like a standards body).
  • Informational Sections / IS examples (IS‑33) — show how the code lists common abbreviations for materials and standards in informational material.

Code references

Grounded in the retrieved California Plumbing Code — click a citation to read the verbatim passage:

  • CPC § 101.2.2 Medium relevance — show source text

    CFC—25: California Fire Code

    101.2.2, 101.4.2, 301.3.1, 302.2, 307.1, 308.1, 802.2.1, 802.2.3, 803.2.3, 803.4.1.1, 803.4.1.2, 803.4.1.3, 803.4.1.4, 803.4.1.5, 803.4.1.6, Table 804.5.1.1(1), 904.1.5, 1011.6.1.1, 1303.1.2, 1305.2.8.1, 1305.2.14, 1305.2.14.1, 1401.2, 1501.1, 1501.5, 1502.1, 1502.1.1, 1502.2, 1502.3, 1504.1, 1507.1, 1507.2

    CMC—25: California Mechanical Code

    302.2, 702.7, 807.1, 902.1.1, 1008.1, 1305.2.7.1, 1305.2.8, 1305.2.8.1

    CPC—25: California Plumbing Code

    302.2, 408.1, 702.7, 1009.1, 1009.2, 1009.3, 1009.5, 1302.1.6, 1503.1

    16-4 2025 CALIFORNIA EXISTING BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    REFERENCED STANDARDS

    CRC—25: California Residential Code

    101.2, 101.4.1, 104.3.1, 109.3.3, 109.3.10, 302.2, 307.1, 308.1, 401.3, 402.1, 405.2.6, 502.2, 502.3, 502.4, 503.2, 503.3, 503.11, 505.2, 505.3, 507.3, 701.3, 702.4, 702.5, 706.2, 708.1, 805.2, 806.4, 809.1, 906.2, 907.1, 1011.2.1, 1103.1, 1103.2, 1103.3, 1104.1, 1201.4, 1302.1.2, 1302.1.3, 1302.1.3, 1303.1.3, 1401.2, 1402.1, 1402.2, 1402.2.1, 1402.3, 1402.4, 1402.5, 1402.6

    ICC 300—2023: ICC Standard on Bleachers, Folding and Telescopic Seating and Grandstands

    301.1.1, 401.1.1, 1401.1.1

    ICC A117.1—2017: Accessible and Usable Buildings and Facilities

  • CPC § 10-09 Medium relevance — show source text

    F. The controller must have the capability to display readings of the percentage of the LEL readings from inside of the gas meter room.

    G. The customer must maintain and calibrate the combustible gas indicator device and all related systems per the manufacturer’s recommendations. An up to date inspection card will be mounted on the wall, just inside the door, signifying the gas detection device has been calibrated and is working accurately.

    H. The light switch will continuously and fully engage the fan when turned on.

    Access to Meter Room

    Applicant must make provisions to allow PG&E access to the gas meter room for emergency response, meter reading, system testing, inspection, and maintenance, in accordance with Gas Rule 16, “Gas Service Extensions.”

    Records

    1. Retain records per the Record Retention Schedule.

    Prepared by: AAJ7 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Page 9 of 11

    Gas Meter Room J-16

    Rev. #03a 10-09-13

    Target Audience

    Design, engineering, estimating, field services, M&C crews, gas T&R, general construction

    Definitions

    NA

    Acronyms and Abbreviations AC: alternating current AWG: American wire gauge cfh: cubic feet per hour CFR: Code of Federal Regulations CPUC: California Public Utilities Commission

    DC: direct current

    EC: electronic corrector

    EFV: excess flow valve

    G.O.: CPUC General Order LEL: lower explosive limit NFPA: National Fire Protection Association

    Compliance Requirement/Regulatory Commitment

    NA

    References

    Curb Valve Installations, Distribution Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-43.2 Gas Service and Mains in Plastic Casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-75 Plastic Main and Service Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-90

    Prefabricated Risers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

  • CPC § 192.353 Medium relevance — show source text

    Breezeway A passage or walkway with full openings on both sides. No sources of ignition or openings into the building.

    Cabinet A structure, not deeper than 36 inches, with a solid or closed top that is freestanding, attached or recessed into a building exterior wall, vapor proof from the building, with access doors for the purpose of containing/protecting a gas meter set or meter set components.

    Enclosure A structure with an open top that is freestanding or attached to a building exterior wall with access doors; a cage; or walls and gate for the purpose of containing/protecting a gas meter set or meter set components.

    Gas meter room A space within a building that is solely used to house natural gas metering equipment in accordance with GDS J-16, “Gas Meter Room.”

    Meter set The gas meter, service regulator, overpressure protection devices, and all associated Company piping and fittings between the service riser valve and the customer houseline.

    Readily accessible location

    For a gas meter set: The preferred location can be accessed immediately and does not require contact with the owner or occupant. If the preferred location is unavailable, the Company may approve a lock box with key for access.

    For a service shut-off valve: The preferred location is outside and aboveground. If the preferred location is unavailable, the Company may approve a curb valve in which no permanent structure prevents immediate valve access or operation.

    Show window A ground floor window in the wall of a commercial building, including any permanent elevated display floors or platforms associated with the window, where the purpose of the window is to present a display to the public.

    Source of ignition As defined by the National Fuel Gas Code Handbook, sources of ignition are defined as “devices or equipment that, because of their intended modes of use or operation, are capable of providing sufficient thermal energy to ignite flammable gas-air mixtures.” This includes electric wiring, switches, and circuit breakers that do not meet the requirements of the National Electric Code for installation in Class 1, Division 2 areas.

    Printed copies of this document might be out of date. The Technical Information Library (TIL) has the current version.

    PG&E Internal Information ©2021 Pacific Gas and Electric Company. All rights reserved. Page 19 of 22

    Gas Meter Locations J-15

    Publication Date: 08/18/2021 Effective Date: 11/01/2021 Rev. 9a

    Acronyms and Abbreviations

    CFR: Code of Federal Regulations CPUC: California Public Utilities Commission

    Compliance Requirement/Regulatory Commitment

    Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section (§) 192.353, “Customer meters and regulators: Location”

    CFR 49 § 192.355, “Customer meters and regulators: Protection from damage”

    CFR 49 § 192.357, “Customer meters and regulators: Installation”

    CFR 49 § 192.363, “Service lines: Valve requirements”

    CFR 49 § 192.365, “Service lines: Location of valves”

    Records and Information Management:

    Information or records generated by this design standard must be managed in accordance with the Enterprise Records and Information (ERIM) Policy, Standards and Enterprise Records Retention Schedule (ERRS). Refer to GOV-7101S, “Enterprise Records and Information Management Standard,” and related standards. Management of records includes, but is not limited to:

  • CPC § 10-09 Medium relevance — show source text
    1. When a combustible gas indicator (CGI) device and controller are installed, the following are required:

    A. A gas sensor must be installed no more than 6” from the ceiling of the gas meter room.

    B. The design and installation of all such detection devices and systems must be done in accordance with and comply with the NFPA-72, National Fire Alarm Code.

    C. The controller must be installed outside of the gas meter room and be located near to the gas meter room door.

    D. All wiring and piping of the transmitter to the controller must meet the requirements of NFPA-70, National Electric Code for Class I, Division 1, Group D locations.

    E. An audible alarm and flashing strobe light must be included as a part of the controller system. This alarm system must continue to be operational until the condition that has triggered such an alarm has been determined and is manually reset.

    F. The controller must have the capability to display readings of the percentage of the LEL readings from inside of the gas meter room.

    G. The customer must maintain and calibrate the combustible gas indicator device and all related systems per the manufacturer’s recommendations. An up to date inspection card will be mounted on the wall, just inside the door, signifying the gas detection device has been calibrated and is working accurately.

    H. The light switch will continuously and fully engage the fan when turned on.

    Access to Meter Room

    Applicant must make provisions to allow PG&E access to the gas meter room for emergency response, meter reading, system testing, inspection, and maintenance, in accordance with Gas Rule 16, “Gas Service Extensions.”

    Records

    1. Retain records per the Record Retention Schedule.

    Prepared by: AAJ7 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Page 9 of 11

    Gas Meter Room J-16

    Rev. #03a 10-09-13

    Target Audience

    Design, engineering, estimating, field services, M&C crews, gas T&R, general construction

    Definitions

    NA

    Acronyms and Abbreviations AC: alternating current AWG: American wire gauge cfh: cubic feet per hour CFR: Code of Federal Regulations CPUC: California Public Utilities Commission

    DC: direct current

    EC: electronic corrector

    EFV: excess flow valve

    G.O.: CPUC General Order LEL: lower explosive limit NFPA: National Fire Protection Association

    Compliance Requirement/Regulatory Commitment

    NA

    References

  • CPC § 6.1507 Medium relevance — show source text

    LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2. Condenser DT = Leaving Condenser Water Temperature (°F) – Entering Condenser Water Temperature (°F)
    Kadj = 6.1507 – 0.30244(×) + 0.0062692(×)2 – 0.000045595(×)3
    where× = Condenser DT + LIFT
    COPadj = Kadj * COPstd|

    A6.207.1.2 Controls for heat pumps with supplementary electric resistance heaters. Heat pumps with supplementary electric resistance heaters shall have controls:

    A6.207.1.2.1 That prevent supplementary heater operation when the heating load can be met by the heat pump alone; and

  • California Plumbing Code Medium relevance — show source text


    2
    5
    8|37
    39
    NA
    NA|83
    56
    NA
    NA|50
    39
    37
    33|58
    59
    77
    90|164
    108
    102
    95|93
    75
    69
    64|83
    83
    107
    122|273
    176
    168
    161|154
    119
    114
    107|123
    121
    151
    175|412
    261
    252
    243|234
    179
    171
    163|161
    155
    193
    223|580
    363
    352
    342|319
    246
    235
    225| |10|0
    2
    5
    10|37
    39
    52
    NA|87
    61
    56
    NA|53
    41
    39
    34|57
    59
    76
    97|174
    117
    111
    100|99
    80
    76
    68|82
    82
    105
    132|293
    193
    185
    171|165
    128
    122
    112|120
    119
    148
    188|444
    287
    277
    261|254
    194
    186
    171|158
    153
    190
    237|628
    400
    388
    369|344
    272
    261
    241| |15|0
    2
    5
    10
    15|36
    38
    51
    NA
    NA|93
    69
    63
    NA
    NA|57
    47
    44
    39
    NA|56
    57
    75
    95
    NA|190
    136
    128
    116
    NA|111
    93
    86
    79
    72|80
    80
    102
    128
    158|325
    225
    216
    201
    186|186
    149
    140
    131
    124|116
    115
    144
    182
    220|499
    337
    326
    308
    290|283
    224
    217
    203
    192|153
    148
    182
    228
    272|713
    473
    459
    438
    418|388
    314
    298
    284
    269| |20|0
    2
    5

  • CPC § 1.2 Medium relevance — show source text

    [BSC] This is an example of a state agency acronym used to identify an adoption or amendment by the agency. The acronyms will appear at California Amendments and in the Matrix Adoption Tables. Sections 1.2 through 1.14 in Chapter 1, Division 1 of this code, explain the used acronyms, the application of state agency adoptions to building occupancies or building features, the enforcement agency as designated by state law (may be the state adopting agency or local building or fire official), the authority in state law for the state agency to make the adoption, and the specific state law being implemented by the agency’s adoption. The following acronyms are used in Title 24 to identify the state adopting agency making an adoption.

    Legend of Acronyms of Adopting State Agencies

    BSC California Building Standards Commission (see Section 1.2)

    BSC-CG California Building Standards Commission-CALGreen (see Section 1.2.2)

    BSCC Board of State and Community Corrections (see Section 1.3)

    SFM Office of the State Fire Marshal (see Section 1.11)

    HCD 1 Department of Housing and Community Development (see Section 1.8.2.1.1)

    HCD 2 Department of Housing and Community Development (see Section 1.8.2.1.3)

    HCD 1/AC Department of Housing and Community Development (see Section 1.8.2.1.2)

    DSA-AC Division of the State Architect-Access Compliance (see Section 1.9.1)

    DSA-SS Division of the State Architect-Structural Safety (see Section 1.9.2)

    DSA-SS/CC Division of the State Architect-Structural Safety/Community Colleges (see Section 1.9.2.2)

    OSHPD 1 Office of Statewide Hospital Planning and Development (see Section 1.10.1)

    OSHPD 1R Office of Statewide Hospital Planning and Development (see Section 1.10.1)

    OSHPD 2 Office of Statewide Hospital Planning and Development (see Section 1.10.2)

    OSHPD 3 Office of Statewide Hospital Planning and Development (see Section 1.10.3)

    OSHPD 4 Office of Statewide Hospital Planning and Development (see Section 1.10.4)

    OSHPD 5 Office of Statewide Hospital Planning and Development (see Section 1.10.5)

    OSHPD 6 Office of Statewide Hospital Planning and Development (see Section 1.10.6)

    DPH Department of Public Health (see Section 1.7)

    AGR Department of Food and Agriculture (see Section 1.6)

    CEC California Energy Commission (see Section 100 in Part 6, the California Energy Code)

    CA Department of Consumer Affairs (see Section 1.4): Board of Barbering and Cosmetology Board of Examiners in Veterinary Medicine Board of Pharmacy Acupuncture Board Bureau of Household Goods & Services Structural Pest Control Board (SPCB)

    SL State Library (see Section 1.12)

    SLC State Lands Commission (see Section 1.14)

    DWR Department of Water Resources (see Section 1.13 of Chapter 1 of the California Plumbing Code in Part 5 of Title 24)

  • California Plumbing Code Medium relevance — show source text


    (feet)|LATERAL
    L
    (feet)|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT|FAN|FAN|NAT| |HEIGHT
    H
    (feet)|LATERAL
    L
    (feet)**|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max|Min|Max|Max| |6|0
    2
    4
    6|38
    39
    NA
    NA|77
    51
    NA
    NA|45
    36
    33
    31|59
    60
    74
    83|151
    96
    92
    89|85
    66
    63
    60|85
    85
    102
    114|249
    156
    152
    147|140
    104
    102
    99|126
    123
    146
    163|373
    231
    225
    220|204
    156
    152
    148|165
    159
    187
    207|522
    320
    313
    307|284
    213
    208
    203| |8|0
    2
    5
    8|37
    39
    NA
    NA|83
    56
    NA
    NA|50
    39
    37
    33|58
    59
    77
    90|164
    108
    102
    95|93
    75
    69
    64|83
    83
    107
    122|273
    176
    168
    161|154
    119
    114
    107|123
    121
    151
    175|412
    261
    252
    243|234
    179
    171
    163|161
    155
    193
    223|580
    363
    352
    342|319
    246
    235
    225| |10|0
    2
    5
    10|37
    39
    52
    NA|87
    61
    56
    NA|53
    41
    39
    34|57
    59
    76
    97|174
    117
    111
    100|99
    80
    76
    68|82
    82
    105
    132|293
    193
    185
    171|165
    128
    122
    112|120
    119
    148
    188|444
    287
    277
    261|254
    194
    186
    171|158
    153
    190
    237|628
    400
    388
    369|344
    272
    261
    241| |15|0
    2
    5

  • CPC § 741-4950 Medium relevance — show source text

    slc.ca.gov MOTEMS.Public@slc.ca.gov

    (510) 741-4950 Marine Oil Terminals

    State Librarian [SL]

    library.ca.gov csllaw@library.ca.gov

    (916) 323-9843 Public Library

    Construction & Renovation

    2025 CALIFORNIA PLUMBING CODE v

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    How to Distinguish Between Model Code Language and California Amendments

    To distinguish between model code language and the incorporated California amendments, including exclusive California standards, California amendments will appear in italic font print.

    [BSC] This is an example of a state agency acronym used to identify an adoption or amendment by the agency. The acronyms will appear at California Amendments and in the Matrix Adoption Tables. Sections 1.2.0 through 1.14.0 in Chapter 1, Division 1 of this code, explain the used acronyms, the application of state agency adoptions to building occupancies or building features, the enforcement agency as designated by state law (may be the state adopting agency or local building or fire official), the authority in state law for the state agency to make the adoption, and the specific state law being implemented by the agency’s adoption. The following acronyms are used in Title 24 to identify the state adopting agency making an adoption.

    Legend of Acronyms of Adopting State Agencies BSC California Building Standards Commission (see Section 1.2.0) BSC-CG California Building Standards Commission-CALGreen (see Section 1.2.3) BSCC Board of State and Community Corrections (see Section 1.3.0) SFM Office of the State Fire Marshal (see Section 1.11.0) HCD-1 Department of Housing and Community Development (see Section 1.8.2.1.1) HCD-2 Department of Housing and Community Development (see Section 1.8.2.1.3) HCD-1/AC Department of Housing and Community Development (see Section 1.8.2.1.2) DSA-AC Division of the State Architect-Access Compliance (see Section 1.9.1) DSA-SS Division of the State Architect-Structural Safety (see Section 1.9.2) DSA-SS/CC Division of the State Architect-Structural Safety/Community Colleges (see Section 1.9.2.2) OSHPD 1 Office of Statewide Hospital Planning and Development (see Section 1.10.1) OSHPD 1R Office of Statewide Hospital Planning and Development (see Section 1.10.1) OSHPD 2 Office of Statewide Hospital Planning and Development (see Section 1.10.2) OSHPD 3 Office of Statewide Hospital Planning and Development (see Section 1.10.3) OSHPD 4 Office of Statewide Hospital Planning and Development (see Section 1.10.4) OSHPD 5 Office of Statewide Hospital Planning and Development (see Section 1.10.5) _OSHPD 6 Office of Statewide Hospital Planning and Development (see Section 1.10.

  • CPC § 61.0 Medium relevance — show source text
    REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
    (COMPOSITION FOR BLENDS)    		 SAFETY
    GROUP    		 OEL2
    (ppm)    		 RCL (lb/Mcf) LFL8
    (lb/Mcf)
    R-401B zeotrope R-22/152a/124 (61.0/11.0/28.0) A1 1000 7.2 ––
    R-401C zeotrope R-22/152a/124 (33.0/15.0/52.0) A1 1000 5.2 ––
    R-402A zeotrope R-125/290/22 (60.0/2.0/38.0) A1 1000 17 ––
    R-402B zeotrope R-125/290/22 (38.0/2.0/60.0) A1 1000 15 ––
    R-403A zeotrope R-290/22/218 (5.0/75.0/20.0) A2 1000 7.6 ––
    R-403B zeotrope R-290/22/218 (5.0/56.0/39.0) A1 1000 18 ––
    R-404A zeotrope R-125/143a/134a (44.0/52.0/4.0) A1 1000 31 ––
    R-405A zeotrope R-22/152a/142b/C318 (45.0/7.0/5.5/42.5) –– 1000 16 ––
    R-406A zeotrope R-22/600a/142b (55.0/4.0/41.0) A2 1000 4.7 18.8
    R-407A zeotrope R-32/125/134a (20.0/40.0/40.0) A1 1000 19 ––
    R-407B zeotrope R-32/125/134a (10.0/70.0/20.0) A1 1000 21 ––
    R-407C zeotrope R-32/125/134a (23.0/25.0/52.0) A1 1000 18 ––
    R-407D zeotrope R-32/125/134a (15.0/15.0/70.0) A1 1000 16 ––
    R-407E zeotrope R-32/125/134a (25.0/15.0/60.0) A1 1000 17 ––
    R-407F zeotrope R-32/125/134a (30.0/30.0/40.0) A1 1000 20 ––
    R-407G zeotrope R-32/125/134a (2.5/2.5/95.0) A1 1000 13 ––
    R-407H zeotrope R-32/125/134a (32.5/15.0/52.5) A1 1000 19 ––
    R-407I zeotrope R-32/125/124a (19.5/8.5/72.
  • CPC § 653-5791 Medium relevance — show source text

    water.ca.gov DWRwebcomment@water.ca.gov

    (916) 653-5791 Plumbing for Recycled Water,

    Floodplain Construction

    Division of the State Architect

    dgs.ca.gov/dsa

    (916) 445-8100

    Access Compliance [DSA-AC]

    (916) 445-5827 DSAaccess@dgs.ca.gov

    Access for Persons with Disabilities

    Structural Safety [DSA-SS, DSA-SS/CC]

    Public Schools & Community Colleges,

    State Essential Services Buildings

    State Historical Building Safety Board [SHBSB]

    (916) 445-7627 shbsb@dgs.ca.gov

    Historical Building Rehabilitation,

    Preservation, Restoration or Relocation

    iv 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    California Code of Regulations Title 24 California State Agency Contact List (continued)

    Energy Commission [CEC]

    energy.ca.gov Title24@energy.ca.gov

    (800) 772-3300 Building Energy Efficiency,

    Compliance Manual & Compliance Forms

    Office of the State Fire Marshal [SFM]

    osfm.fire.ca.gov codedevelopment@fire.ca.gov

    (916) 568-3800 Fire & Life Safety

    State Lands Commission [SLC]

    slc.ca.gov MOTEMS.Public@slc.ca.gov

    (510) 741-4950 Marine Oil Terminals

    State Librarian [SL]

    library.ca.gov csllaw@library.ca.gov

    (916) 323-9843 Public Library

    Construction & Renovation

    2025 CALIFORNIA PLUMBING CODE v

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    How to Distinguish Between Model Code Language and California Amendments

    To distinguish between model code language and the incorporated California amendments, including exclusive California standards, California amendments will appear in italic font print.

    [BSC] This is an example of a state agency acronym used to identify an adoption or amendment by the agency. The acronyms will appear at California Amendments and in the Matrix Adoption Tables. Sections 1.2.0 through 1.14.0 in Chapter 1, Division 1 of this code, explain the used acronyms, the application of state agency adoptions to building occupancies or building features, the enforcement agency as designated by state law (may be the state adopting agency or local building or fire official), the authority in state law for the state agency to make the adoption, and the specific state law being implemented by the agency’s adoption. The following acronyms are used in Title 24 to identify the state adopting agency making an adoption.

    Legend of Acronyms of Adopting State Agencies _BSC California Building Standards Commission (see Section 1.

  • CPC § 15.2 Medium relevance — show source text

    1, “Mueller Flanged Tees Types H-17505 and
    H-17506”

    GDS C-11, “Mueller Valve, Tee-Type H-17656”

    GDS C-13, “Service Tapping Tee with Coupon Retaining
    Punch”

    GDS B-91, “Transition Fittings for Polyethylene Pipe”| |Steel Service Tees|Mueller|Mueller| |Steel Two-Piece Line
    Stopper Fittings|Mueller|
    GDS C-15.2, “Mueller Welding Line Stopper Fittings
    H-17055, H-17056, H-17155, and H-17156”

    GDS C-15.3, “Mueller Welding Line Stopper Fittings
    H-17255, H-17256, H 17257, H-17275, H-17276,
    and H-17277”| |Steel Two-Piece Line
    Stopper Fittings|Blackhawk (Stopple
    fitting)|Blackhawk (Stopple
    fitting)| |Steel Two-Piece Line
    Stopper Fittings|TDW (Stopple fitting)|TDW (Stopple fitting)| |Steel Two-Piece Line
    Stopper Fittings with Bottom
    Connection|Mueller|
    GDS C-16.2, “Mueller Welding Line Stopper Fittings with
    Bottom Connection”| |Steel Two-Piece Spherical
    Line Stopper Fittings with
    Bottom or Side Connection|Mueller|
    GDS C-17, “Mueller Spherical Line Stopper Fittings”| |Steel Unions
    Insulated Threaded|Central Plastics|
    GDS O-23, “Insulated Threaded Unions”|

    PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.

    ©2019 Pacific Gas and Electric Company. All rights reserved.

    Page 3 of 7

    PG&E-Approved Gas Materials Manufacturers N-01

    Publication Date: 08/21/2019 Effective Date: 11/21/2019 Rev. 4a

    Target Audience

    Personnel involved in gas engineering and construction inspection.

    Definitions

    NA

    Acronyms and Abbreviations

    PE: Polyethylene QSL: Qualified Suppliers List

    Compliance Requirement / Regulatory Commitment

    Code of Federal Regulations (CFR) Title 49, Part 192—Transportation of Natural and other Gas by Pipeline: Minimum Federal Safety Standards, Subpart B‒Materials

    References

    EMS-2502, “Specifications for Furnishing and Delivery of Polyethylene (PE) Plastic Tubing, ½ in. and 1 in.”

    EMS-2503, “Specifications for Furnishing and Delivery of Polyethylene (PE) Plastic Piping, 1-1/4 in. to 10 in.”

    EMS-4758, “Heat Fusion Fittings for Polyethylene (PE) Gas Piping and Tubing”

    EMS-4761, “Non-Corrodible Mechanical Fittings for Polyethylene Gas Piping and Tubing”

    EMS-6421, “Specifications for Furnishing and Delivery of Pre-Fabricated Metal-Cased Plastic ¾ in. × ½ in. CTS and ¾ in. × 1 in. CTS Gas Service Risers”

  • California Plumbing Code Medium relevance — show source text


    2
    5
    10
    15|36
    38
    51
    NA
    NA|93
    69
    63
    NA
    NA|57
    47
    44
    39
    NA|56
    57
    75
    95
    NA|190
    136
    128
    116
    NA|111
    93
    86
    79
    72|80
    80
    102
    128
    158|325
    225
    216
    201
    186|186
    149
    140
    131
    124|116
    115
    144
    182
    220|499
    337
    326
    308
    290|283
    224
    217
    203
    192|153
    148
    182
    228
    272|713
    473
    459
    438
    418|388
    314
    298
    284
    269| |20|0
    2
    5
    10
    15
    20|35
    37
    50
    NA
    NA
    NA|96
    74
    68
    NA
    NA
    NA|60
    50
    47
    41
    NA
    NA|54
    56
    73
    93
    NA
    NA|200
    148
    140
    129
    NA
    NA|118
    99
    94
    86
    80
    NA|78
    78
    100
    125
    155
    186|346
    248
    239
    223
    208
    192|201
    165
    158
    146
    136
    126|114
    113
    141
    177
    216
    254|537
    375
    363
    344
    325
    306|306
    248
    239
    224
    210
    196|149
    144
    178
    222
    264
    309|772
    528
    514
    491
    469
    448|428
    344
    334
    316
    301
    285| |30|0
    2
    5

  • CPC § 4.1 Medium relevance — show source text
    • 100°F
      (16°C-38°C)|1 h|6 h|2 h|12 h|6 h|24 h| |40°F-60°F
      (4°C-16°C)|2 h|12 h|4 h|24 h|12 h|48 h| |10°F- 40°F
      (-12°C+4°C)|8 h|48 h|16 h|96 h|48 h|8 days| |*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|

    2025 CALIFORNIA PLUMBING CODE 467

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    IS 33

    FIGURE 1

    LOCATION OF THRUST BLOCKS (STANDARD AND METRIC COMBINED) A COMPARISON OF THRUST-BLOCK AREAS (See Section 4.1)

    468 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    IS 33

    FIGURE 2

    THRUST BLOCK BEARING AREA (See Section 5.2.2)

    2025 CALIFORNIA PLUMBING CODE 469

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    IS 33

    Uniform Plumbing Code References for Ductile Iron and PVC Pressure Building Supply and Exterior Cold-Water Piping

    The following sections of the 2024 Uniform Plumbing Code apply to ductile iron and PVC pressure building supply and exterior cold-water piping.

    Chapter 3 General Regulations

    309.0 Workmanship

    312.0 Protection of Piping, Materials, and Struc tures

    313.0 Hangers, Supports, and Anchors

    314.0 Trenching, Excavation, and Backfill

    Chapter 6 Water Supply and Distribution

    604.0 Materials (water piping)

    Table 604.1 Materials for Building Supply and Water Distribution Piping and Fittings

    605.4 Ductile Iron Pipe and Joints

    605.12 PVC Plastic Pipe and Joints

    605.16.2 Plastic Pipe to Other Materials

    609.0 Installation, Testing, Unions, and Location

    Abbreviations

    IAPMO International Association of Plumbing and Mechanical Officials

    UPC Uniform Plumbing Code published by IAPMO

    AWWA American Water Works Association

    CSA Canadian Standards Association

    Applicable Standards.

    ASME B16.4 Gray Iron Threaded Fittings Classes 125 and 250

    ASTM D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

    ASTM D2241 Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

  • CPC § 309.0 Medium relevance — show source text

    2025 CALIFORNIA PLUMBING CODE 469

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    IS 33

    Uniform Plumbing Code References for Ductile Iron and PVC Pressure Building Supply and Exterior Cold-Water Piping

    The following sections of the 2024 Uniform Plumbing Code apply to ductile iron and PVC pressure building supply and exterior cold-water piping.

    Chapter 3 General Regulations

    309.0 Workmanship

    312.0 Protection of Piping, Materials, and Struc tures

    313.0 Hangers, Supports, and Anchors

    314.0 Trenching, Excavation, and Backfill

    Chapter 6 Water Supply and Distribution

    604.0 Materials (water piping)

    Table 604.1 Materials for Building Supply and Water Distribution Piping and Fittings

    605.4 Ductile Iron Pipe and Joints

    605.12 PVC Plastic Pipe and Joints

    605.16.2 Plastic Pipe to Other Materials

    609.0 Installation, Testing, Unions, and Location

    Abbreviations

    IAPMO International Association of Plumbing and Mechanical Officials

    UPC Uniform Plumbing Code published by IAPMO

    AWWA American Water Works Association

    CSA Canadian Standards Association

    Applicable Standards.

    ASME B16.4 Gray Iron Threaded Fittings Classes 125 and 250

    ASTM D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

    ASTM D2241 Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

    ASTM D2466 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40

    ASTM D2467 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80

    ASTM F1970 Special Engineered Fittings, Appurtenances or Valves for use in Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Systems

    AWWA C110 Ductile Iron and Gray-Iron Fittings

    AWWA C111 Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings

    AWWA C151 Ductile-Iron Pipe, Centrifugally Cast

    AWWA C153 Ductile-Iron Compact Fitting

    AWWA C900 Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 in. through 12 in. (100 mm through 300 mm)

    AWWA C904 Crosslinked Polyethylene (PEX) Pressure Tubing, ½ in. through 3 In. (13 mm through 76 mm), for Water Service

    AWWA C907 Injection-Molded Polyvinyl Chloride (PVC) Pressure Fittings, 4 In, through 12 in (100 mm through 300 mm) for Water, Wastewater and Reclaimed Water Service

    IAPMO/

    ANSI UPC-1 Uniform Plumbing Code

    470 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  • CPC § 102.3 Medium relevance — show source text

    1

    CEBC—25: California Existing Building Code

    102.3, 1011.5.2, 1103.1, 1104.18, 1105.5.2

    CMC—25: California Mechanical Code

    201.3, 308.3, 605.1, 605.2.1.1, 605.2.1.2, 605.2.1.3, 605.2.1.4, 605.2.1.5, 605.3, 605.4, 605.4.2.3, 605.4.2.5, 605.5.2, 605.7, 606.1, 606.2, 608.1, 608.3, 608.4, 608.5, 608.8, 608.9.1, 608.10, 608.17, 610.1.1, 903.2.11.4, 904.14, 907.3.1, 909.1, 909.10.2, 909.13.1, 910.4.7, 915.6.1, 1006.2.2.3, 1011.16, 1020.6.1, 1207.4.7, 1207.6.1, 1207.6.1.2.2, 1207.11.8, 2104.2.1, 2105.3, 2301.1, 2301.6, 2309.3.1.2, 2311.3.1, 2311.4.3, 2311.8.2, 2311.8.8, 2311.8.10, 2404.9, 2404.9.2, 2504.5, 2703.2.2, 2703.10.4, 2703.14, 2803.2, 2803.3, 3001.1, 3003.1, 3004.2, 3108.12.1, 3108.12.2, 3703.5, 3804.1.1.7, 3904.1, 3905.3, Table 5003.1.1(1), 5003.8.4.2, 5003.8.5.2, 5003.8.6.2, 5004.3.1, 5303.7.6, 5303.16.9, 5305.5, 5306.2.2, 5306.2.3, 5307.4.4, 5504.2.1.3, 5504.2.2.3, 5505.4.1.1, 5701.3, 5703.6.1, 5704.2.8.9, 5705.3.7.5.1, 5706.2, 5706.4.4, 6003.1.3, 6003.2.3.2, 6004.2.2.7, 6005.3.1, 6005.3.2, 6103.2.1.7

    CPC—25: California Plumbing Code

  • CPC § 205.0 Medium relevance — show source text

    0
    205.0
    206.0
    207.0
    208.0
    209.0
    210.0
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    225.0||||||||||||||||||||||||| |Adopting Agency
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
    205.0
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    225.0||X||X|X|||||||||||||||||||| |Adopting Agency
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
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    225.0||||X|X|||||||||||||||||||| |Adopting Agency
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.

  • CPC § 207.0 Medium relevance — show source text

    0
    207.0
    208.0
    209.0
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    211.0
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    223.0
    225.0|X|X||X|X|X||||||||||||||||||| |Adopting Agency
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    225.0||||||||||||||||||X||||||| |Adopting Agency
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.0
    204.0
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    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below
    Chapter/Section
    203.

  • CPC § 1.4 Medium relevance — show source text

    1.4, 705.3.3| |ASTM C4-2004 (R2018)|Standard Specification for Clay Drain Tile and Perforated Clay
    Drain Tile|Piping|Table 1101.4.6| |ASTM C425-2021|Standard Specification for Compression Joints for Vitrified
    Clay Pipe and Fittings|Joints|705.8.1| |ASTM C564-2020a|Standard Specification for Rubber Gaskets for Cast Iron Soil
    Pipe and Fittings|Joints|705.2.2| |ASTM C700-2018|Standard Specification for Vitrified Clay Pipe, Extra Strength,
    Standard Strength, and Perforated|Piping|Table 701.2,
    Table 1101.4.6| |ASTM C1053-2000 (R2015)|Standard Specification for Borosilicate Glass Pipe and Fittings
    for Drain, Waste, and Vent (DWV) Applications|Piping|811.2| |ASTM C1173-2018|Standard Specification for Flexible Transition Couplings for
    Underground Piping Systems|Fittings|705.10| |ASTM C1277-2020|Standard Specification for Shielded Couplings Joining Hubless
    Cast Iron Soil Pipe and Fittings|Fixtures|301.2.4, 705.2.2| |ASTM C1460-2021|Standard Specification for Shielded Transition Couplings for
    Use With Dissimilar DWV Pipe and Fittings Above Ground|Joints|705.10| |ASTM C1461-2021|Standard Specification for Mechanical Couplings Using Ther-
    moplastic Elastomeric (TPE) Gaskets for Joining Drain, Waste,
    and Vent (DWV), Sewer, Sanitary, and Storm Plumbing Sys-
    tems for Above and Below Ground Use|Joints|705.10|

    340 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    REFERENCED STANDARDS

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    ASTM C1540-2020 Standard Specification for Heavy-Duty Shielded Couplings
    Joining Hubless Cast Iron Soil Pipe and Fittings    		 Joints 705.2.2
    ASTM C1563-2008
    (R2021)    		 Standard Test Method for Gaskets for Use in Connection with
    Hub and Spigot Cast Iron Soil Pipe and Fittings for Sanitary
    Drain, Waste, Vent, and Storm Piping Applications    		 Joints 705.2.2
    ASTM C1822-2021 Standard Specification for Insulating Covers on Accessible
    Lavatory Piping    		 Miscellaneous 403.3
    ASTM D1253-2014 Standard Test Method for Residual Chlorine in Water Miscellaneous 1506.10.6, 1603.4.1
    ASTM D1785-2021a Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Pipe, Schedules 40, 80, and 120    		 Piping Table 604.1, Table
    701.
  • California Plumbing Code Medium relevance — show source text


    5
    10
    15
    20|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|38
    35
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|73
    67
    59
    NA
    NA|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|123
    115
    105
    95
    80|NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA|200
    183
    170
    156
    144|163
    NA
    NA
    NA
    NA|520
    NA
    NA
    NA
    NA|273
    252
    235
    217
    202| |30|2
    5
    10
    15
    20
    30|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|41
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|81
    75
    66
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|136
    127
    113
    105
    88
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|215
    196
    182
    168
    155
    NA|158
    NA
    NA
    NA
    NA
    NA|578
    NA
    NA
    NA
    NA
    NA|302
    279
    260
    240
    223
    182| |50|2
    5
    10
    15
    20
    30|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|91
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|160
    149
    136
    124
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|250
    228
    212
    195
    180
    NA|NA
    NA
    NA
    NA
    NA
    NA|NA
    NA
    NA
    NA
    NA
    NA|350
    321
    301
    278
    258
    NA| |Minimum
    internal area of
    chimney
    (square inches)|Minimum
    internal

  • CEC § 202 Medium relevance — show source text

    Example:

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6
    Adopt entire chapter
    Adopt entire chapter as
    amended (amended sections
    listed below)    		 X
    Adopt only those sections
    that are listed below    		 S A M P L E
    Chapter/Section
    202 X

    2025 CALIFORNIA BUILDING CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Adopt only those sections that are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

    Example:

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

  • CRC § 202 Medium relevance — show source text

    Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6
    Adopt entire chapter
    Adopt entire chapter as
    amended (amended
    sections listed below)    		 X
    Adopt only those sections
    that are listed below    		 S A M P L E
    Chapter/Section
    202 X

    2025 CALIFORNIA RESIDENTIAL CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Adopt only those sections that are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

    Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

  • CFC § 202 Medium relevance — show source text

    Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6
    Adopt entire chapter
    Adopt entire chapter as
    amended (amended
    sections listed below)    		 X
    Adopt only those sections
    that are listed below    		 S A M P L E
    Chapter/Section
    202 X

    2025 CALIFORNIA FIRE CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Adopt only those sections that are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

    Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

  • CWUIC § 202 Medium relevance — show source text

    Adopt the entire IWUIC chapter as amended, state-amended sections are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency has adopted the entire model code chapter; with state amendments.

    Each section that a state agency has amended and/or added within a particular chapter is listed. There will be an “X” under an agency’s acronym in the row of the amended and/or added section.

    Example:

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

    Adopting Agency BSC BSC-
    CG    		 SFM Col5 HCD Col7 Col8 DSA Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting Agency BSC BSC-
    CG    		 T-24 T-19* 1 2 1-AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
    Adopt Entire Chapter
    Adopt Entire Chapter as
    amended (amended sections
    listed below)    		 X
    Adopt only those sections that
    are listed below    		 S A M P L E
    [California Code of Regulations,
    Title 19, Division 1]
    Chapter / Section
    202 X

    2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Adopt only those sections that are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

    Example:

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

  • California Building Code Medium relevance — show source text

    Example:

    CALIFORNIA EXISTING BUILDING CODE-MATRIX ADOPTION TABLE

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS (Matrix Adoption Tables are nonregulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6
    Adopt entire chapter X
    Adopt entire chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below    		 S A M P L E
    Chapter/Section

    Adopt the entire IEBC chapter as amended, state-amended sections are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency has adopted the entire model code chapter; with state amendments.

    Each section that a state agency has amended and/or added within a particular chapter is listed. There will be an “X” under an agency’s acronym in the row of the amended and/or added section.

    Example: CHAPTER 2 – DEFINITIONS

  • CPC § 1.12 Medium relevance — show source text

    SL State Library (see Section 1.12)

    SLC State Lands Commission (see Section 1.14)

    DWR Department of Water Resources (see Section 1.13 of Chapter 1 of the California Plumbing Code in Part 5 of Title 24)

    The state agencies are available to answer questions about their adoptions. Contact information is provided on page iv of this code.

    To learn more about the use of this code refer to pages viii and ix. Training materials on the application and use of this code are available at the website of the California Building Standards Commission www.dgs.ca.gov/bsc.

    2025 CALIFORNIA EXISTING BUILDING CODE v

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    vi 2025 CALIFORNIA EXISTING BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    California Matrix Adoption Tables

    Format of the California Matrix Adoption Tables

    The matrix adoption tables, examples of which follow, are non-regulatory aids intended to show the user which state agencies have adopted and/or amended given sections of the model code. An agency's statutory authority for certain occupancies or building applications determines which chapter or section may be adopted, repealed, amended or added. See Chapter 1, Division I, Sections 1.2 through 1.14 for agency authority, building applications and enforcement responsibilities.

    The side headings identify the scope of state agencies’ adoption as follows:

    Adopt the entire IEBC chapter without state amendments.

    If there is an “X” under a particular state agency’s acronym on this row; this means that particular state agency has adopted the entire model code chapter without any state amendments.

    Example:

    CALIFORNIA EXISTING BUILDING CODE-MATRIX ADOPTION TABLE

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS (Matrix Adoption Tables are nonregulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6
    Adopt entire chapter X
    Adopt entire chapter as
    amended (amended
    sections listed below)
    Adopt only those sections
    that are listed below    		 S A M P L E
    Chapter/Section
  • CPC § 1.4 Medium relevance — show source text

    CA Department of Consumer Affairs (see Section 1.4): Board of Barbering and Cosmetology Board of Examiners in Veterinary Medicine Board of Pharmacy Acupuncture Board Bureau of Household Goods & Services Structural Pest Control Board (SPCB)

    SL State Library (see Section 1.12)

    SLC State Lands Commission (see Section 1.14)

    DWR Department of Water Resources (see Section 1.13 of Chapter 1 of the California Plumbing Code in Part 5 of Title 24)

    The state agencies are available to answer questions about their adoptions. Contact information is provided on page v of this code.

    To learn more about the use of this code refer to pages vii and ix. Training materials on the application and use of this code are available at the website of the California Building Standards Commission www.dgs.ca.gov/bsc.

    vi 2025 CALIFORNIA WILDLAND-URBAN INTERFACE CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    California Matrix Adoption Tables

    Format of the California Matrix Adoption Tables

    The matrix adoption tables, examples of which follow, are nonregulatory aids intended to show the user which state agencies have adopted and/or amended given sections of the model code. An agency's statutory authority for certain occupancies or building applications determines which chapter or section may be adopted, repealed, amended or added. See Chapter 1, Division I, Sections 1.2 through 1.14 of the California Building Code for agency authority, building applications and enforcement responsibilities.

    The side headings identify the scope of state agencies’ adoption as follows:

    Adopt the entire IWUIC chapter without state amendments.

    If there is an “X” under a particular state agency’s acronym on this row, this means that particular state agency has adopted the entire model code chapter without any state amendments.

    Example:

    CALIFORNIA WILDLAND-URBAN INTERFACE CODE-MATRIX ADOPTION TABLE

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS (Matrix Adoption Tables are nonregulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building applications.)

  • CEC § 2025 Medium relevance — show source text

    2025 CALIFORNIA BUILDING CODE vii

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    Adopt only those sections that are listed below:

    If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

    Example:

    CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1-AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6
    Adopt entire chapter
    Adopt entire chapter as
    amended (amended sections
    listed below)
    Adopt only those sections
    that are listed below    		 X X S A M P L E
    Chapter/Section
    202 X X
    203 X X

    viii 2025 CALIFORNIA BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    MARGINAL MARKINGS

    Symbols in the margin indicate the status of code changes as follows:

    This symbol indicates that a change has been made to a California amendment.

    �

    This symbol indicates deletion of California amendment language.

    This symbol indicates that a change has been made to International Code Council model language.

    This symbol indicates deletion of International Code Council model language.

    A single asterisk [*] placed in the margin indicates that text or a table has been relocated within the code. A double asterisk [**] placed in the margin indicates that the text or table immediately following it has been relocated there from elsewhere in the code.

    RELOCATION OF TEXT OR TABLES

    The following table indicates relocation of sections and tables in the 2024 edition of the IBC from the 2021 edition.

  • CPC § 1323.13.3 Medium relevance — show source text

    2, 1323.13.3| |1326.4 - 1326.10|1326.5 - 1326.11| |1505.6 - 1505.14|1505.5 - 1505.13| |Figure 1505.10|Figure 1505.9| |1506.6 - 1506.13|1506.5 - 1506.12| |1603.3 - 1603.4|1603.4 - 1603.5| |Table 1603.4|Table 1603.5| |1603.5 - 1603.19|1603.6 - 1603.20| |1603.20|1503.2.4| |L 402.9 - L 402.11|L 402.8 - L 402.10| |L 404.9 - L 404.12|L 404.8 - L 404.11| |L 411.5, L 411.6|L 411.2, L411.3| |L 411.7|L 411.4| |L 411.9 - L 411.12|L 411.5 - L 411.8|

    xxii 2025 CALIFORNIA PLUMBING CODE

    ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

    RELATED PUBLICATIONS AND SERVICES

    The Documents Listed are Not by this Reference Adopted by The State of California.

    IAPMO provides a variety of other products which are useful for inspectors, building officials, architects, engineers,

    manufacturers, contractors, plumbers, and apprentices.

    IAPMO Headquarters Directory

    4755 East Philadelphia Street, Ontario, California 91761-2816

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    Publication Toll Free Fax: 877-85-CODES

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    Uniform Plumbing Code – 2024 Edition:

    The Uniform Plumbing Code is the most widely adopted plumbing code in the world. The 2024 edition contains complete “turnkey” requirements for the installation and maintenance of plumbing systems, all in one easy to use book.

    Uniform Plumbing Code Illustrated Training Manual:

    The UPC Illustrated Training Manual is an excellent reference for anyone involved in the plumbing industry. It contains an extensive definitions section and several hundred comprehensive technical diagrams and illustrations. It serves as a textbook, and it also is useful as a valuable tool for explaining the intent and use of the Code.

    Uniform Plumbing Code Study Guide:

    This book is the perfect complement to the UPC Illustrated Training Manual. Alone, it constitutes a complete self-study course for learning the UPC. It has hundreds of questions, general practice exams, and plumbing math, pipe sizing exercises and fitting identification. A big help in getting you ready for a certification exam!

    Guide to Important Code Questions to the Uniform Plumbing Code:

    An excellent reference for learning and understanding plumbing code changes and identifies code changes between editions. It is a useful tool for preparing code change proposals.

    Uniform Mechanical Code – 2024 Edition:

    The Uniform Mechanical Code contains complete requirements for the installation and maintenance of heating, ventilating, cooking and refrigeration systems.

    Uniform Mechanical Code Illustrated Training Manual:

    Contains technical diagrams and illustrations that demonstrate the intent and use of the UMC. A great reference for everyone involved in Mechanical HVACR design and installation.

    Uniform Mechanical Code Study Guide:

  • CPC § 203.7.3 Medium relevance — show source text


    Title 19, Division 1]||||X|||||||||||||||||||| |Chapter / Section|||||||||||||||||||||||| |203.7.3|||X||||||||||||||||||||| |203.7.3.6 - 203.7.3.8|||X||||||||||||||||||||| |203.7.4|||X||||||||||||||||||||| |203.7.4.1|||X||||||||||||||||||||| |203.9.1|||X||||||||||||||||||||| |203.9.2|||X||||||||||||||||||||| |203.9.2.1|||X||||||||||||||||||||| |203.9.2.2|||X||||||||||||||||||||| |203.9.3|||X||||||||||||||||||||| |203.9.3.3|||X||||||||||||||||||||| |203.9.4|||X||||||||||||||||||||| |203.12|||X||||||||||||||||||||| |203.13|||X|||||||||||||||||||||

    • The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.

    2-4 2025 CALIFORNIA FIRE CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    2 DEFINITIONS

    User notes:

    About this chapter: Codes, by their very nature, are technical documents. Every word, term and punctuation mark can add to or change the meaning of a technical requirement. It is necessary to maintain a consensus on the specific meaning of each term contained in the code. Chapter 2 performs this function by stating clearly what specific terms mean for the purpose of the code. General definitions are located in Section 202 and occupancy classification definitions are located in Section 203.

    SECTION 201—GENERAL

    201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this code, have the meanings shown in this chapter.

    201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.

    201.3 Terms defined in other codes. Where terms are not defined in this code and are defined in the California Building Code, Cali- fornia Mechanical Code or California Plumbing Code, such terms shall have the meanings ascribed to them as in those codes.

    201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. Merriam Webster’s Collegiate Dictionary, 11th Edition, shall be considered as providing ordinarily accepted meanings.

    SECTION 202—GENERAL DEFINITIONS

Frequently asked questions

Where exactly in the CPC should I look first for any abbreviation I encounter?

Look first in Chapter 2 — § 203.0 (Definitions and Abbreviations). If the short form looks like a state agency (BSC, DWR, OSHPD), check the Chapter 1 legend and matrix next.

If § 203.0 doesn't list the abbreviation, what next?

Check the Referenced Standards table (Table 1701.1) and the referenced standard itself; also check Chapter 1 legend for agency acronyms and any California amendments.

Are agency acronyms (like BSC, DWR) defined in § 203.0?

No — agency acronyms are summarized in Chapter 1’s legend and adoption/matrix tables rather than in § 203.0. Consult Chapter 1 (see Section 1.2 / legend).

Can an abbreviation have different meanings in different parts of Title 24?

Yes. The meaning can depend on context, the specific Part/Chapter, or the referenced standard — always check the local context and referenced standards.

I need the exact wording of § 203.0. Can you quote it here?

The uploaded CPC previews show the matrix identifying § 203.0 as the definitions section, but a verbatim extract of § 203.0 was not available in the provided files. Consult an authoritative copy of the 2025 California Plumbing Code (publisher PDF or print) to read the exact text.

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Related in the CPC

What does 'Accessible' and 'Accessible, Readily' mean in the CPC?

Accepted Engineering Practice and material abbreviations (ABS, LP-Gas, etc.)

Common general definitions (A–G)

California Plumbing Code