CPC · California Plumbing Code

How is Chapter 1 adopted and how is the CPC formatted?

Chapter 1 explains how California adopts the Uniform Plumbing Code: the CPC incorporates the UPC by reference, shows agency adoption choices in a Matrix Adoption Table (entire chapter, as amended, or only listed sections), and defines state agency authority in Division I. The specific language of § 1.1.11 and § 1.1.12 was referenced in the uploaded adoption listings but the full text of those two sections was not included in the retrieved files, so check the official CPC for their exact wording. file

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Last reviewed: July 6, 2026

What the code requires — plain English (2–4 sentences)

Chapter 1 of the California Plumbing Code (CPC) establishes the administration and adoption framework for the rest of the Part (Title 24, Part 5). The CPC incorporates the Uniform Plumbing Code by reference and uses a Matrix Adoption Table to show which state agencies adopt an entire chapter, adopt it as amended, or adopt only listed sections (§ 1.1.0 and § 1.1.1). The CPC identifies agency authorities and the scope of agency adoptions in Chapter 1, Division I (see §§ 1.2 through 1.14) .

The single most important rule: Chapter 1 tells you WHICH state agency adopts WHICH parts of the UPC (entire chapter, entire chapter as amended, or only specified sections) — use the Matrix Adoption Table in Chapter 1 to determine applicable law.

Note: I was asked to ground the material in § 1.1.11 and § 1.1.12. The uploaded CPC files show references to those section numbers in the adoption/matrix listings, but the full, specific text of § 1.1.11 and § 1.1.12 was not present in the retrieved files, so I cannot quote or paraphrase their exact language here. The discussion below therefore relies on the retrieved Chapter 1 material (titles, matrix, format and adoption descriptions) and points out where the missing sections appear in the matrix .

Requirements in detail

1) What “adoption” means in the CPC

  • The CPC is the California adoption (Part 5) of the model Uniform Plumbing Code (UPC); the CPC incorporates by adoption the UPC with California amendments (see § 1.1.1) .
  • Adoption happens by reference and is documented in the CPC text and the Matrix Adoption Tables that accompany Chapter 1. The Matrix shows three typical adoption scopes: Adopt the entire chapter, Adopt entire chapter as amended, and Adopt only listed sections .

2) How the CPC is formatted (the relevant structure)

  • The CPC reproduces UPC content and identifies California amendments (italics or special markings) and revision markings; it also includes the UPC chapter organization (Chapter 1 is Administration; Chapter 2 is Definitions; etc.) file.
  • The Matrix Adoption Tables are non‑regulatory aids in Chapter 1 that show, by agency acronym, what was adopted and what sections were amended (the matrix is intended to be read in tandem with Chapter 1 Division I text) .

3) Who adopts what (agency scope and enforcement)

  • Chapter 1 defines agency acronyms and links them to enforcement scope (for example OSHPD, SFM, DSA, DPH, DWR, etc.) and cross‑references the Division I sections that explain each agency’s authority (see §§ 1.2–1.14) file.
  • Some agencies adopt an entire chapter as amended (the matrix will show an “X” under the column labeled “Adopt Entire Chapter as amended”); others adopt only particular sections (an “X” in the row for a specific section) .

Decision-relevant dimensions (TABLE)

Decision dimension Values / examples Code Reference
Adoption scope Adopt Entire Chapter / Adopt Entire Chapter as amended / Adopt only listed sections See Matrix Adoption Table in Chapter 1
Source document UPC (incorporated by reference) with California amendments § 1.1.1; Format of UPC (chapter list) file
Agency list / acronyms BSC, SFM, OSHPD, DSA, DPH, DWR, etc. Chapter 1 Division I (agency descriptions) and acronyms table file
Where to check local applicability Chapter 1 Matrix Adoption Table plus Division I text (sections 1.2–1.14) Chapter 1 explanatory text and matrix (Chapter 1, Division I)
Specific controlling sections requested § 1.1.11, § 1.1.12 These section numbers appear in the matrix/adoption listings in the retrieved files, but their full text was not present in the uploaded files so exact wording is not available here

4) Reading the Matrix Adoption Table (practical steps)

  • Find the Chapter and Section row(s) in the Matrix Adoption Table for the topic you need. The column heading lists state agencies (by acronym).
  • If the agency column has an “X” under “Adopt Entire Chapter as amended,” that agency has adopted the chapter and its specific California amendments. If the agency column has an “X” only in a specific section row, the agency adopted only that section.
  • Cross‑check the agency acronym with the Division I text (Sections 1.2–1.14) to learn the agency’s statutory authority and enforcement responsibility file.

Exceptions & special cases

  • Agency-specific adoptions: Some agencies adopt different material for their regulated facilities (for example OSHPD adoption language and the scope for OSHPD 1–6 are shown in Division I) — check the adoption matrix combined with the relevant Division I subsection for special scopes and exceptions file.
  • Non‑adopted chapters/sections: The Matrix shows sections or chapters not adopted by particular agencies (example: the state may not adopt a model chapter for some agencies). The Matrix and Division I together indicate when a chapter/section is not adopted by the State Fire Marshal or another agency .
  • Missing text for requested sections: The retrieved files list § 1.1.11 and § 1.1.12 in the matrix/adoption listings, but the uploaded files did not include their full textual content; therefore any exception language that might appear inside those sections cannot be stated here because it was not retrieved .

Common mistakes

  • Misreading the Matrix as regulatory text: the Matrix Adoption Tables are a non‑regulatory aid showing adoption scope — the actual enforceable text is the CPC sections themselves and any California amendments noted in the code text (not the matrix alone) .
  • Assuming “adopted” means identical everywhere: some agencies adopt the UPC as amended — California amendments are embedded in the CPC text and must be read with the UPC language (California amendments are often shown in italics or with revision markings) .
  • Not checking agency authority: failing to cross‑reference the agency acronym in the matrix with Division I (Sections 1.2–1.14) can lead to applying the wrong agency’s rules to a building type (e.g., OSHPD vs local AHJ) .
  • Overlooking that specific sections (for example § 1.1.11 and § 1.1.12) may contain agency-specific rules or clarifications — because those section texts were not retrieved here, you must check the official CPC to confirm their exact language .

Worked example — concrete scenario

Scenario: You are reviewing plumbing rules for a state‑regulated hospital building and must determine which Chapter 1 rules apply.

  1. Open Chapter 1 Matrix Adoption Table and locate the column headed OSHPD 1 (or OSHPD 1R where applicable). The Division I text explains which OSHPD column applies to which facilities (see 1.10.1 and related subsections) .
  2. If the Matrix shows an X for “Adopt Entire Chapter as amended” under the OSHPD 1 column, that means OSHPD adopted the UPC chapter with California amendments for the hospitals it regulates. If an X appears only in specific section rows, OSHPD adopted only those sections for its facilities .
  3. Example numeric read: suppose the Matrix row for Chapter 1 – Section 202 has an X under OSHPD and the “Adopt Entire Chapter as amended” row also has an X. That indicates OSHPD adopts Chapter 1 as amended and specifically amended Section 202; read the CPC text for the amended language and cross‑check the Division I subsection for enforcement and authority details .
  4. For any site‑specific questions (e.g., whether a California amendment changes permit filing deadlines), read the CPC section text and consult the agency’s Division I description; the Matrix just tells you whether those provisions were adopted for that agency’s scope .

Related provisions (quick list)

  • § 1.1.0 — General (Chapter 1 purpose and scope)
  • § 1.1.1 — Title; incorporation of UPC and California amendments (how CPC cites the UPC)
  • § 1.1.2 — Purpose statement for the code (public health, safety, welfare)
  • § 1.2 – § 1.14 — Division I sections that define state agency authorities, acronyms, and enforcement scopes (use with the Matrix) file
  • § 1.10.1 – § 1.10.6 — OSHPD application and identification subsections (examples of agency-specific adoption entries)

Note again: the specific textual contents of § 1.1.11 and § 1.1.12 were not present in the uploaded files; I can point to where those section numbers appear in the adoption matrix and Division I listings, but cannot provide their exact language because it was not retrieved here .

Code references

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

  • CPC § 1.2.0 High relevance — show source text

    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 the following pages. 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 PLUMBING CODE

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

    CALIFORNIA MATRIX ADOPTION TABLES

    Format of the 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 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 1.2.0 through 1.14.0, for agency authority, building application and enforcement responsibilities.

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

    Adopt the entire UPC chapter without state amendments.

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

    Example:

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 1 - GENERAL CODE PROVISIONS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

    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    		 X



    Adopt Entire Chapter as
    amended (amended
    sections listed below)    		 S A M P L E


    Adopt only those sections
    that are listed below

    Chapter/Section
    202

    Adopt the entire UPC chapter as amended, state-amended sections are listed below: If there is an “X” under a particular state agency’s acronym in this row, it means that a particular state agency has adopted the entire model code chapter, with state amendments.

  • CPC § 1.13 High relevance — show source text

    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.

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    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 IRC 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 RESIDENTIAL 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 IRC 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.

  • California Plumbing Code High relevance — show source text

    ; 2′ C.R.S. with 1″ cover on
    both top and bottom flanges; 13′1″ span
    restrained.|60 psf|2 hrs|||7|1, 3|2| |F/C-6-RC-34|61/4″|61/4″ thick; 43/4″ (5120 psi) concrete core;
    1″ T&G board flooring;1/2″ plaster under-
    coat; 4″ × 3″ × 10 lbs R.S.J.; 3′ C.R.S. flush
    with top surface concrete; 12′ span simply
    supported; 2″ × 1′3″ clinker concrete
    insert.|100 psf|4 hrs|||7|1, 7|4| |F/C-6-RC-35|61/4″|43/4″ (3600 psi) concrete core; 1″ T&G
    board flooring;1/2″ plaster undercoat; 4″ ×
    3″ × 10 lbs R.S.J.; 3′ C.R.S. flush with top
    surface concrete; 12′ span simply
    supported; 2″ × 1′3″ clinker concrete
    insert.|100 psf|2 hrs
    30 min|||7|1, 5|21/2| |F/C-6-RC-36|61/4″|43/4″ (2800 psi) concrete core; 1″ T&G
    board flooring;1/2″ plaster undercoat; 4″ ×
    3″ × 10 lbs R.S.J.; 3′ C.R.S. flush with top
    surface concrete; 12″ span simply
    supported; 2″ × 1′3″ clinker concrete
    insert.|80 psf|4 hrs|||7|1, 7|4| |F/C-7-RC-37|7″|(3640 psi) concrete deck;1/4″ reinforce-
    ment bars at 6″ pitch with 11/2″ cover;1/4″
    reinforcement bars at 5″ pitch perpendic-
    ular with 11/2″ cover; 13′1″ span
    restrained.|169 psf|6 hrs|||7|1, 14|6| |F/C-7-RC-38|7″|(4060 psi) concrete deck; 4″ × 3″ × 10 lbs
    R.S.J.; 2′6″ C.R.S. with 11/2″ cover on both
    top and bottom flanges; 4″ × 6″ × 13 SWG
    mesh reinforcement 11/2″ from bottom of
    slab; 13′1″ span restrained.|175 psf|6 hrs|||7|1, 14|6| |F/C-7-RC-39|71/4″|53/4″ (4010 psi) concrete core; 1″ T&G
    board flooring;1/2″ plaster undercoat;
    4″ × 3″ × 10 lbs R.S.J.; 2′6″ C.R.S.

  • CPC § 2308.10 Medium relevance — show source text

    walls 2308.10 Calculated fire resistance 722.6 Ceiling framing 2308.11 Connectors and fasteners 2304.10,

    2308.5

    Contacting concrete, masonry or earth 2304.12.1.3, 2304.12.1.4, 2304.12.2.1, 2304.12.2.2, 2304.12.2.6 Cross-laminated timber 2301.2, 2303.1, 2303.1.4, 2304.11.2.1, 2304.11.3.1, 2304.11.4.1 Cutting, notching and boring of dimensional wood framing 2308.6 Decay, protection against 2304.12 Diaphragms 2305.1, 2305.2, 2306.2 Dimensions 2301.2 Draftstopping 718.3, 718.4 End-jointed lumber 2303.1.1.2 Fiberboard 2303.1.6, Table 2306.3(2) Fireblocking 718.2 Fire-retardant treated 2303.2 Floor and roof framing (see Floor Construction, Wood) 2304.4 Floor sheathing 2304.8 Foundation 1807.1.4, 2304.10.6.2, 2304.12.1.2, 2308.10.8.1, 2308.7 Grade, lumber 2303.1.1

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    INDEX

    Hardboard 2303.1.7 Heavy timber construction 602.4, 2304.11

    Hurricane shutters 1609.2

    I-joist 2303.1.2 Inspection, special 1705.12.1, 1705.13.2, 1705.5 Lateral force-resisting systems 2305 Light-frame construction, conventional 2308 Load and resistance factor design 2307

    Moisture content 2303.1.9.2, 2303.2.9, 2303.7, 2304.9.5.1, Table 2305.2(1), Table 2305.2(2) Nails and staples 2303.6 Plywood, hardwood 2303.3 Preservative treated 1402.6, 1402.9,

    2303.1.9 Roof framing (see Roof Construction, Wood)

    2304.4 Roof sheathing 2304.8 Seismic provisions 2305, 2306, 2308.10.10, 2308.10.6, 2308.10.8 Shear walls 2305, 2306.3 Standards and quality, minimum 2303 Structural panels 2303.1.5 Supporting concrete or masonry 2304.13 Termite, protection against 2304.12 Trusses 2303.4

    Veneer Chapter 14 Wall framing (see Wall, Wood Construction)

    2304.3 Wall sheathing, exterior 2304.6 Wood Frame Construction Manual

  • CEC § 202 Medium relevance — show source text

    Adopt the entire UPC chapter as amended, state-amended sections are listed below: If there is an “X” under a particular state agency’s acronym in this row, it means that a 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:

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 1 - GENERAL CODE PROVISIONS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 1 - GENERAL CODE PROVISIONS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

    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 X S A M P L E


    Adopt only those sections
    that are listed below

    Chapter/Section
    202 X X

    2025 CALIFORNIA PLUMBING CODE vii

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

    Adopt only those sections which are listed below: If there is an “X” under a particular state agency’s acronym in 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:

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 1 - GENERAL CODE PROVISIONS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

  • CPC § 1.10.3.1 Medium relevance — show source text

    1.10.3.1 Applicable administrative standards. 1. Title 24, Part 1, California Code of Regulations: Chapter 7. 2. Title 24, Part 2, California Code of Regulations: Sections 1.1 and 1.10, Chapter 1, Division I, and as adopted in Chapter 1, Divi- sion II.

    1.10.3.2 Applicable building standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10 and 11.

    The provisions of Title 24, Part 2, as adopted and amended by OSHPD, shall apply to the applications listed in Section 1.10.3.

    OSHPD 3 adopts the following building standards in Title 24, Part 2:

    Chapter 12.

    1.10.3.3 Identification of amendments. For applications listed in Section 1.10.3, amendments appear in this code without the acro- nym [OSHPD 3]. Adoptions are shown in the adoption matrix.

    Authority— Health and Safety Code Sections 127010, 127015 and 1226.

    References— Health and Safety Code Sections 127010, 127015, 129885 and 1226, Government Code Section 54350 and State Constitution Article 11, Section 7.

    1.10.4 OSHPD 4. Specific scope of application of the agency responsible for enforcement, enforcement agency and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

    Application— Correctional treatment centers.

    Enforcing agency— Health Care Access and Information/Office of Statewide Hospital Planning and Development (OSHPD). The office shall also enforce the California Energy Commission—Energy Regulations, the Division of the State Architect—Access Compliance regulations and the regulations of the Office of the State Fire Marshal for the above-stated facility types.

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    ADMINISTRATION

    1.10.4.1 Applicable administrative standards. 1. Title 24, Part 1, California Code of Regulations: Chapter 7. 2. Title 24, Part 2, California Code of Regulations: Sections 1.1 and 1.10, Chapter 1, Division I, and as adopted in Chapter 1, Division II.

    1.10.4.2 Applicable building standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10 and 11.

    The provisions of Title 24, Part 2, as adopted and amended by OSHPD, shall apply to the applications listed in Section 1.10.4.

    OSHPD 4 adopts the following building standards in Title 24, Part 2:

    Chapters 2 through 10, 12, 14, 15, 16A, 17A, 18A, 19A, 20, 21A, 22A, 23, 24, 25, 26, 30, 31, 32, 33, 35 and Appendix L.

  • CPC § 1.11. Medium relevance — show source text
    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
    Chapter / Section

    The state agency does not adopt sections identified with 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.

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    APPENDIX C-26 2025 CALIFORNIA EXISTING BUILDING CODE

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    APPENDIX C—GUIDELINES FOR THE WIND RETROFIT OF EXISTING BUILDINGS

    CHAPTER C2 ROOF DECK FASTENING FOR HIGH-WIND AREAS

    SECTION C201—GENERAL

    [BS] C201.1 Purpose. This chapter provides prescriptive methods for partial structural retrofit of an existing building to increase its resistance to wind loads. It is intended for voluntary use where the basic wind speed, V, is greater than 130 mph (58 m/s) in accordance with Figure 1609.3(2) of the California Building Code and for reference by mitigation programs. The provisions of this chapter do not necessarily satisfy requirements for new construction. Unless specifically cited, the provisions of this chapter do not necessarily satisfy requirements for structural improvements triggered by addition, alteration, repair, change of occupancy, building relocation or other circumstances.

    [BS] C201.2 Eligible conditions. The provisions of this chapter are applicable only to buildings that meet either of the following eligibility requirements:

    1. Buildings assigned to Risk Category I or II in accordance with Table 1604.5 of the California Building Code .
    2. Buildings within the scope of the California Residential Code .

    SECTION C202—ROOF DECK ATTACHMENT FOR WOOD ROOFS

  • CPC § 4A-4 Medium relevance — show source text

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    REPAIRS

    SECTION 408 A —PLUMBING

    408 A .1 Materials. Plumbing materials and supplies shall not be used for repairs that are prohibited in the Title 24 Part 5 California Plumbing Code (CPC).

    408 A .2 Water closet replacement. The maximum water consumption flow rates and quantities for all replaced water closets shall be 1.28 gallons ( 4.8 L) per flushing cycle.

    408 A .3 Health care facilities. Portions of medical gas systems being repaired in Group I-2, ambulatory care facilities and outpatient clinics shall comply with NFPA 99 requirements for repairs.

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    CALIFORNIA EXISTING BUILDING CODE – MATRIX ADOPTION TABLE

    CHAPTER 5 – PRESCRIPTIVE COMPLIANCE METHOD

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code 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 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 X X
    Adopt Entire Chapter as
    amended (amended
    sections listed below)    		 X X X
    Adopt only those sections
    that are listed below    		 X X X X X X X X
    Chapter / Section
    501 X X X X
    501.1 X X X
    501.1 –501.3 X
    501.1.2 X
    501.
  • CPC § 1605.3.3 Medium relevance — show source text

    NONPOTABLE RAINWATER CATCHMENT SYSTEMS

    (3) Fixtures, potable, and rainwater shall be tested and inspected for flow. Flow from a rainwater catchment water system outlet shall indicate a cross-connection. No flow from a potable water outlet shall indicate that it is connected to the rainwater system.

    (4) The drain on the rainwater catchment water system shall be checked for flow during the test and at the end of the period.

    (5) The potable water system shall then be completely drained.

    (6) The rainwater catchment water system shall then be activated and pressurized. When rainwater is not available for the initial cross-connection test, a tem- porary connection to a potable water supply shall be required. At the conclusion of the initial cross- connection test, the temporary connection to the potable water supply shall be disconnected.

    (7) The rainwater catchment water system shall remain pressurized for a minimum period of time specified by the Authority Having Jurisdiction while the potable water system is empty. The minimum period the potable water system is to remain depressurized shall be determined on a case-by-case basis, but in no case shall that period be less than 1 hour.

    (8) Fixtures, potable and rainwater catchment, shall be tested and inspected for flow. Flow from a potable water system outlet shall indicate a cross-connection. No flow from a rainwater catchment water outlet shall indicate that it is connected to the potable water system.

    (9) The drain on the potable water system shall be checked for flow during the test and at the end of the period.

    (10)Where there is no flow detected in the fixtures which would indicate a cross-connection, the potable water system shall be repressurized. 1605.3.3 Discovery of Cross-Connection. In the event that a cross-connection is discovered, the following procedure, in the presence of the Authority Having Jurisdiction, shall be activated immediately:

    (1) Rainwater catchment piping to the building shall be shutdown at the supply source(s), and the rainwater riser shall be drained.

    (2) Potable water piping to the building shall be shutdown at the meter.

    (3) The cross-connection shall be uncovered and disconnected.

    (4) The building shall be retested following procedures listed in Section 1605.3.1 and Section 1605.3.2.

    (5) The potable water system shall be chlorinated with 50 ppm chlorine for 24 hours.

    (6) The potable water system shall be flushed after 24 hours, and a standard bacteriological test shall be performed. Where test results are acceptable, the potable water system shall be permitted to be recharged.

    332 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 PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 17 - REFERENCED STANDARDS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  • CPC § 24-1 Medium relevance — show source text

    (Note: Part VI is not adopted. See California Mechanical Code and California Plumbing Code, Title 24, Parts 4 and 5.)

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    Part VII—Plumbing

    (Note: Part VII is not adopted. See California Plumbing Code, Title 24, Part 5.)

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    Part VIII—Electrical

    (Note: Part VIII is not adopted. See California Electrical Code, Title 24, Part 3.)

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    CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

    CHAPTER 44 – REFERENCED STANDARDS

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code 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 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 5 5 5 5 5 5 5 5
    Adopt entire chapter
    Adopt entire chapter as
    amended (amended
    sections listed below)    		 X X
    Adopt only those sections
    that are listed below
    Chapter / Section
    AAMA X
    ACCA X
    ANSI X X
    ASME X
    ASTM X X
    ASTM
  • CPC § 9.2.2 Medium relevance — show source text

    Entire Chapter||||||||||||||||||||||||| |Adopt Entire Chapter as
    amended (amended sections
    listed below)||||||||||||||||||||||||| |Adopt only those sections
    that are listed below|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X|X| |Chapter/Section||||||||||||||||||||||||| |1.9.2.2 & 1.9.2.2.1|||||||||X|||||||||||||||| |1.10.1 and subsections||||||||||X|X|||||||||||||| |1.10.2 and subsections||||||||||||X||||||||||||| |1.10.3 and subsections|||||||||||||X|||||||||||| |1.10.4 and subsections||||||||||||||X||||||||||| |1.10.5 and subsections|||||||||||||||X|||||||||| |1.10.6 and subsections||||||||||||||||X||||||||| |1.11.0 through 1.11.11|||X|||||||||||||||||||||| |1.12.0|||||||||||||||||||||||X|| |1.13.0||||||||||||||||||||X||||| |1.14.0||||||||||||||||||||||||X| |Division II –
    Scope and Administration||||||||||||||||||||||||| |101.0 – 104.1||||||||||X|X|X|X|X|X|||||||||| |104.2 (Items 1 – 5)||||X|X|||||||||||||||||||| |104.3 – 107.0||||||||||X|X|X|X|X|X|||||||||| |104.4.3.1|X||||||||||||||||||||||||

    This state agency does not adopt sections identified with 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 1.11.0.

    2 2025 CALIFORNIA MECHANICAL CODE

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

    CHAPTER 1

    ADMINISTRATION

    DIVISION I CALIFORNIA ADMINISTRATION

    1.1.0 General.

  • CPC § 10.4 Medium relevance — show source text

    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 1.7.0) AGR Department of Food and Agriculture (see Section 1.6.0) CEC California Energy Commission (see Section 100 in Part 6, the California Energy Code) CA Department of Consumer Affairs (see Section 1.6.0): Board of Barbering and Cosmetology Board of Examiners in Veterinary Medicine Board of Pharmacy Acupuncture Board Bureau of Household Goods and Services

    SPCB Structural Pest Control Board

    SL State Library (see Section 1.12.0) SLC State Lands Commission (see Section 1.14.0) DWR Department of Water Resources (see Section 1.13.0 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 the following pages. 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 PLUMBING CODE

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

    CALIFORNIA MATRIX ADOPTION TABLES

    Format of the 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 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 1.2.0 through 1.14.0, for agency authority, building application and enforcement responsibilities.

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

    Adopt the entire UPC chapter without state amendments.

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

    Example:

    CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

    CHAPTER 1 - GENERAL CODE PROVISIONS

    (Matrix Adoption Tables are non-regulatory, intended only as an aid to the user. See Chapter 1 for state agency authority and building application.)

  • CPC § 1.10.1.1 Medium relevance — show source text

    OSHPD 1 and OSHPD 1R

    Application – [OSHPD 1] General acute care hospital build- ings. [OSHPD 1R] Non-conforming hospital SPC or free- standing buildings that have been removed from acute care service.

    Enforcing Agency – Health Care Access and Informa- tion/Office of Statewide Hospital Planning and Development (OSHPD). The office shall enforce the Division of the State Architect access compliance regulations and the regulations of the Office of the State Fire Marshal for the above stated facility types.

    1.10.1.1 Applicable Administrative Standards.

    1. Title 24, Part 1, California Code of Regulations: Chapters 6 and 7.

    2. Title 24, Part 2, California Code of Regulations: Sections 1.1.0 and 1.10.0, Chapter 1, Division I, and as indicated in the adoption matrix for Chapter 1, Division II.

    1.10.1.2 Applicable Building Standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10, and 11.

    Authority Cited – Health and Safety Code Sections 127010, 127015, 1275, and 129850.

    References – Health and Safety Code Sections 19958, 127010, 127015, 129680, 1275, and 129675 through 130070.

    1.10.1.3 Adopting Agency Identification. The provisions of this code applicable to buildings identified in this Sub- section 1.10.1 will be identified in the Matrix Adoption Tables under the acronym OSHPD 1, and OSHPD 1R.

    1.10.2 OSHPD 2. Specific scope of application of the agency responsible for enforcement, enforcement agency, specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

    OSHPD 2

    Application – Skilled nursing facilities and intermediate care facility buildings.

    2025 CALIFORNIA PLUMBING CODE 13

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

    DIVISION I CALIFORNIA ADMINISTRATION

    Enforcing Agency – Health Care Access and Informa- tion/Office of Statewide Hospital Planning and Devel- opment (OSHPD). The office shall also enforce the Division of the State Architect access compliance regu- lations and the regulations of the Office of the State Fire Marshal for the above stated facility type.

    1.10.2.1 Applicable Administrative Standards.

    1. Title 24, Part 1, California Code of Regulations: Chapter 7.

    2. Title 24, Part 2, California Code of Regulations: Sections 1.1.0 and 1.10.0, Chapter 1, Division I, and as indicated in the adoption matrix for Chapter 1, Division II.

  • 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

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    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 § 1.10.1.3 Medium relevance — show source text

    1.10.1.3 Adopting Agency Identification. The provisions of this code applicable to buildings identified in this Sub- section 1.10.1 will be identified in the Matrix Adoption Tables under the acronym OSHPD 1, and OSHPD 1R.

    1.10.2 OSHPD 2. Specific scope of application of the agency responsible for enforcement, enforcement agency, specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

    OSHPD 2

    Application – Skilled nursing facilities and intermediate care facility buildings.

    2025 CALIFORNIA PLUMBING CODE 13

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

    DIVISION I CALIFORNIA ADMINISTRATION

    Enforcing Agency – Health Care Access and Informa- tion/Office of Statewide Hospital Planning and Devel- opment (OSHPD). The office shall also enforce the Division of the State Architect access compliance regu- lations and the regulations of the Office of the State Fire Marshal for the above stated facility type.

    1.10.2.1 Applicable Administrative Standards.

    1. Title 24, Part 1, California Code of Regulations: Chapter 7.

    2. Title 24, Part 2, California Code of Regulations: Sections 1.1.0 and 1.10.0, Chapter 1, Division I, and as indicated in the adoption matrix for Chapter 1, Division II.

    1.10.2.2 Applicable Building Standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10, and 11.

    Authority Cited – Health and Safety Code Sections 127010, 127015, 1275, and 129850.

    References – Health and Safety Code Sections 127010, 127015, 1275, and 129680.

    1.10.2.3 Adopting Agency Identification. The provisions of this code applicable to buildings identified in this Sub- section 1.10.2 will be identified in the Matrix Adoption Tables under the acronym OSHPD 2.

    1.10.3 OSHPD 3. Specific scope of application of the agency responsible for enforcement, enforcement agency, specific authority to adopt and enforce such provisions of this code, unless otherwise stated.

    OSHPD 3

    Application – Licensed clinics and any freestanding building under a hospital license where outpatient clin- ical services are provided.

    Enforcing Agency – Local building department.

    1.10.3.1 Applicable Administrative Standards.

    1. Title 24, Part 1, California Code of Regulations: Chapter 7.

    2. Title 24, Part 2, California Code of Regulations: Sections 1.1.0 and 1.10.0, Chapter 1, Division I, and as indicated in the adoption matrix for Chapter 1, Division II.

  • CPC § 11.0 Medium relevance — show source text

    11.0 - 1.11.11_|||X|||||||||||||||||||||| |1.13.0||||||||||||||||||||X||||| |Division II - Scope and
    Administration||||||||||||||||||||||||| |101.0||||||||||X|X|X||X|X|||||||||| |102.0||||||||||X|X|X||X|X|||||||||| |103.0||||||||||X|X|X||X|X|||||||||| |104.2 Items 1 & 2||||X|X|||||||||||||||||||| |104.3.1||||||||||X|X|X||X|X|||||||||| |104.4.3.1|X|||||||||||||||||||||||| |105.0||||||||||X|X|X||X|X||||||||||

    This state agency does not adopt sections identified with 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 1.11.0.

    2 2025 CALIFORNIA PLUMBING CODE

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

    CHAPTER 1

    ADMINISTRATION

    DIVISION I

    CALIFORNIA ADMINISTRATION

    1.1.0 General.

    1.1.1 Title. These regulations shall be known as the Califor- nia Plumbing Code, may be cited as such and will be referred to herein as “this code.” The California Plumbing Code is Part 5 of thirteen parts of the official compilation and publi- cation of the adoption, amendment, and repeal of plumbing regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 Uniform Plumb- ing Code of the International Association of Plumbing and Mechanical Officials with necessary California amendments.

    1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation, and energy con- servation; safety to life and property from fire and other haz- ards attributed to the built environment; and to provide safety to fire fighters and emergency responders during emergency operations.

    1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replace- ment, repair, equipment, use and occupancy, location, main- tenance, removal, and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures throughout the State of California.

  • 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.

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    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.)

  • CPC § 1.2 Medium relevance — show source text

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

    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 italics.

    [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 the Cali- fornia Building 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)

  • CPC § 5.2 Medium relevance — show source text

    CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

    CHAPTER 5 – NONRESIDENTIAL MANDATORY MEASURES

    DIVISION 5.2 – ENERGY EFFICIENCY

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

    Adopting agency BSC BSC-
    CG    		 SFM HCD Col6 Col7 DSA Col9 OSHPD Col11 Col12 Col13 Col14 Col15 BSCC DPH AGR DWR CEC CA SL SLC
    Adopting agency BSC BSC-
    CG    		 SFM 1 2 1/AC AC SS 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
    Adopt entire CA chapter
    Adopt entire chapter as
    amended (amended
    sections listed below)
    Adopt only those sections that
    are listed below    		 X
    Chapter/Section
    Division 5.2 X

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    5 NONRESIDENTIAL MANDATORY MEASURES

    DIVISION 5.2 – ENERGY EFFICIENCY

    SECTION 5.201—GENERAL

    5.201.1 Scope. California Energy Code . For the purposes of mandatory energy efficiency standards in this code, the California Energy Commission will continue to adopt mandatory building standards.

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    CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

    CHAPTER 5 – NONRESIDENTIAL MANDATORY MEASURES

    DIVISION 5.3 – WATER EFFICIENCY AND CONSERVATION

    (Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

  • CPC § 5 Medium relevance — show source text

    Adoption The Uniform Plumbing Code is available for adoption and use by jurisdictions in the United States and Internationally. Its use within a governmental jurisdiction is accomplished through adoption by reference in accordance with applicable jurisdictional laws. At adoption, jurisdictions should insert the applicable information in bracketed words in the sample ordinance. The sample legislation for adoption of the Uniform Plumbing Code on page xx provides key components, regulations and resolutions.

    Revision Markings Solid vertical lines in the margins indicate a technical change from the requirements of the 2021 edition. An arrow ( ) in the margin indicates where an entire section, paragraph, exception, figure, or table has been deleted, or an item in a list of items or a table has been deleted.

    A double right angle ( « ) in the margin indicates that the text, table, or figure has been relocated within the code. The table found on page xxii points out the relocations in the 2024 edition of the Uniform Plumbing Code .

    TIA TIA indicates that the revision is the result of a Tentative Interim Amendment. TIA For further information on tentative interim amendments see Section 5 of the IAPMO TIA TIA Regulations Governing Committee Projects available at https://www.iapmo.org/code**TIA** development

    A reference in brackets [ ] following a section or paragraph indicates material that has been extracted from another document. A reference in brackets { } following a section or paragraph indicates material that has been extracted from another document and has been modified further by the Technical Committee. This reprinted material is not the complete and official position of the source document on the referenced subject that is represented by the standard in its entirety. Material contained in this document that is taken or extracted from NFPA standards is used with permission of the National Fire Protection Association. This material is not the complete and official position of the NFPA on the reference subject, which is represented solely by the relevant standard in its entirety. NFPA standards can be accessed at www.nfpa.org. In addition, this extracted material may include revisions or modifications developed through IAPMO’s standards development process. Therefore, NFPA disclaims responsibility for the content of this code.

    Text that is extracted pursuant to IAPMO’s Extract Guidelines, but outside of the regular revision process is denoted with the use of the source document in the margin. This text is not fully processed by IAPMO in accordance with ANSI’s public announcement consensus requirements for an American National Standard (ANS) nor approved by ANSI’s Board of Standards Review. The next revision cycle processes such text in accordance with those requirements.

    xii 2025 CALIFORNIA PLUMBING CODE

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

    FORMAT OF THE UNIFORM PLUMBING CODE

    The format of the Uniform Plumbing Code (UPC) arranges each chapter in accordance with a specific subject matter. However, Chapter 3 is dedicated to general requirements that are applicable to every chapter. The subject matters are divided as follows:

    CHAPTERS SUBJECTS
    1 Administration
    2 Definitions
    3 General Regulations
    4 Plumbing Fixtures and Fixture Fittings
    5 Water Heaters
    6 Water Supply and Distribution
    7 Sanitary Drainage
    8 Indirect Wastes
    9 Vents
    10 Traps and Interceptors
    11 Storm Drainage
    12 Fuel Gas

Frequently asked questions

What is the Matrix Adoption Table and where is it located?

The Matrix Adoption Table is a non‑regulatory aid in Chapter 1 that shows which state agencies adopt entire chapters, adopt chapters as amended, or adopt only listed sections; it appears in Chapter 1 (Division I) of the CPC .

If a state agency column has an “X” under “Adopt Entire Chapter,” does that mean local jurisdictions cannot amend?

No. An “X” in the Matrix shows the state agency adopted the chapter for its jurisdictional scope. Local jurisdictions still follow the state code framework and may have limited local amendments only where state law and the code allow; always read the CPC text and consult the agency Division I authority sections for enforcement details .

How do I know which agency enforces a given CPC section?

Cross‑reference the agency acronym in the Matrix with the Division I subsections (Sections 1.2–1.14) where each agency’s Application and Enforcing Agency are described (for example OSHPD entries in § 1.10.x) .

Where are California amendments shown in the CPC text?

California amendments are shown inline with the UPC text (often in italics or with revision markings); the CPC also uses margin symbols and revision markings to show technical changes and deletions — see the Format/Revision Markings description in the CPC front material file.

I specifically need the wording of § 1.1.11 and § 1.1.12. Where can I find them?

The uploaded files listed § 1.1.11 and § 1.1.12 in the matrix/adoption listings, but did not include their full text. To see the exact wording, consult the official CPC (Title 24, Part 5) document or the California Building Standards Commission website for the full code text of those sections. The matrix points to where they apply, but the exact language wasn’t in the retrieved files .

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