CPC · California Plumbing Code

Which definitions in Chapter 2 apply to my project?

If a word important to your plumbing project appears in Chapter 2 of the California Plumbing Code, you must use that Chapter 2 definition; ordinary words not listed keep their common meanings. Check Chapter 2 (alphabetical list) first and watch for bracketed agency notes that may change applicability.

Ask a question free See coverage

Last reviewed: July 6, 2026

What the code requires — 2–4 sentences

For any project regulated by the California Plumbing Code, the words and terms that appear in Chapter 2 have the meanings given in that chapter — those meanings govern how the rest of the Code is applied. The Code explicitly says the Chapter 2 definitions apply “for the purpose of this code” and will be used instead of ordinary dictionary meanings where the chapter defines a term (§ 201.1).

If a word or phrase is listed in Chapter 2, use that Chapter 2 meaning for your plumbing project; ordinary words not defined there keep their common meaning unless the code says otherwise. § 201.1 is the controlling rule.

Requirements in detail

Which terms are binding on my project

  • If a term appears in Chapter 2, that Chapter 2 definition is the governing meaning for the CPC — use it when interpreting provisions, design requirements, or permit conditions. § 201.1.
  • The Code intentionally does not attempt to redefine ordinary words that are used in their normal sense; only terms that the code specifically defines in Chapter 2 get special, code-specific meanings. § 201.1.

How the definitions are organized (for lookup)

  • Definitions in Chapter 2 are arranged alphabetically by the first word of the defined term, which makes lookup predictable. § 202.1.

Quick decision table (decision-relevant dimensions)

Decision question What to check / possible values Code reference
Does Chapter 2 define the term? Yes → use Chapter 2 definition. No → ordinary meaning applies unless another referenced document defines it. § 201.1
Are ordinary (dictionary) words redefined? Generally no; the Code will not redefine ordinary words unless necessary. § 201.1
Where are definitions listed? Alphabetically in Chapter 2 (look under the first word of the term). § 202.1
If a term is defined by another referenced standard or state agency, which definition controls? Use the definition identified by the Code or the referenced document indicated in the text or bracketed adoption notes. (Where the CPC delegates, check the bracketed agency note next to the definition.) See Chapter 2 entries (example: agency tags in definitions).

Practical rules of application

  • Always search Chapter 2 first for any term that materially affects compliance (e.g., Accessory Dwelling Unit, Air Gap, Indirect Waste). If found, the Chapter 2 wording controls interpretation and technical application.
  • If a definition includes a bracketed agency or footnote (for example, state agency tags in the definition list), that signals limited adoption or special applicability — verify whether your project falls under that adopting agency’s jurisdiction.

Exceptions & special cases

  • Ordinary words used in their normal sense are not redefined by the Code; do not assume every technical-sounding word is a defined term (§ 201.1).
  • Some definitions include bracketed agency tags or cross-references to other California codes or referenced standards. Where the Code points to another document (or shows an adopting agency), that other source’s definition or the agency’s adoption note may control for projects under that agency’s jurisdiction. The Chapter 2 entries themselves will indicate those cases.
  • If a term is not in Chapter 2 but is defined in a referenced code (for example, California Building Code, a referenced standard, or a state agency supplement), you must use the definition in the referenced document where the CPC points you there. The CPC text in Chapter 2 and its entries will indicate when this applies.

Common mistakes

  • Assuming every technical word in the CPC is defined — many are ordinary words and keep their normal meanings (§ 201.1).
  • Ignoring bracketed agency notes and adopting-agency tables that limit or modify which definitions are adopted for certain state-regulated facilities (e.g., OSHPD, HCD). Those notes matter for projects under those agencies.
  • Applying a dictionary or trade definition when the Chapter 2 definition exists — that can lead to incorrect sizing, permitting, or inspections. Always check Chapter 2 first. § 201.1.

Worked example — concrete scenario

Scenario: You are converting an attached garage into an accessory dwelling unit (ADU) and want to know whether the term Accessory Dwelling Unit (ADU) in Chapter 2 applies to code requirements for plumbing fixtures and water service.

Step 1 — Look up the term in Chapter 2: the Chapter 2 entry for Accessory Dwelling Unit appears in the CPC definitions (Chapter 2). Because it is listed there, the Chapter 2 definition applies to your plumbing project. Use that definition when determining required fixtures, sanitation, and which state agency rules apply. § 201.1.

Step 2 — Check for bracketed agency notes: the ADU entry in Chapter 2 shows bracketed tags ([HCD 1 & HCD 2]) indicating state housing agency references — confirm whether HCD rules also apply to your project type and jurisdiction. If your project falls under HCD jurisdiction, apply any additional HCD-specific requirements referenced in the Chapter 2 entry.

Step 3 — Result (practical): Because Accessory Dwelling Unit is defined in Chapter 2, use that definition for permit submittals, fixture counts, and any code interpretations tied to the ADU term; do not substitute a non‑code definition. § 201.1.

Related provisions

  • § 201.0 — General (Chapter 2 heading and scope introductory material).
  • § 201.1 — Applicability (definitions in Chapter 2 apply “for the purpose of this code”).
  • § 202.0 — Definition of Terms (chapter organization heading).
  • § 202.1 — General (definitions are arranged alphabetically).

Code references

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

  • CPC § 1103.1 High relevance — show source text

    (3) Not less than two drains shall be installed in roof areas of 10 000 square feet (929 m [2] ) or less, and not less than one additional drain shall be installed for each 10 000 square feet (929 m [2] ) of roof area exceeding 10 000 square feet (929 m [2] ). (4) Each roof drain shall have a precalibrated, fixed (nonadjustable), and proportional weir (notched) in a standing water collar inside the strainer. No mechanical devices or valves shall be permitted. (5) Pipe sizing shall be based on the pre-calibrated rate of flow (gpm) (L/s) of the pre-calibrated weir for the maximum allowable water depth, and Table 1103.1 and Table 1103.2.

    (6) The height of stones or other granular material above the waterproofed surface shall not be considered in water depth measurement, and the roof surface in the vicinity of the drain shall not be recessed to create a reservoir.

    (7) Roof design, where controlled-flow roof drainage is used, shall be such that the design roof live load is not less than 30 lb/ft [2] (146 kg/m [2] ) to provide a safety factor exceeding the 15 lb/ft [2] (73 kg/m [2] ) represented by the depth of water stored on the roof in accordance with Table 1105.1(1). (8) Scuppers shall be provided in parapet walls. The distance of scupper bottoms above the roof level at the drains shall not exceed the maximum distances specified in Table 1105.1(2).

    (9) Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the circumference of

    208 2025 CALIFORNIA PLUMBING CODE

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

    STORM DRAINAGE

    the roof drain required for the area served, sized in accordance with Table 1103.1.

    (10)Flashings shall extend above the top of the scuppers.

    (11)At a wall or parapet, 45 degree (0.79 rad) cants shall be installed.

    (12)Separate storm and sanitary drainage systems shall be provided within the building.

    (13)Calculations for the roof drainage system shall be submitted along with the plans to the Authority Having Jurisdiction for approval.

    TABLE 1105.1(1) CONTROLLED-FLOW MAXIMUM ROOF WATER DEPTH

    ROOF RISE*
    (inches)    		 MAXIMUM WATER DEPTH AT
    DRAIN
    (inches)

    Flat    		 3

    2    		 4

    4    		 5

    6    		 6

    For SI units: 1 inch = 25.4 mm

    • Vertical measurement from the roof surface at the drain to the highest point of the roof surface served by the drain, ignoring a local depression immediately adjacent to the drain.

    TABLE 1105.1(2) DISTANCE OF SCUPPER BOTTOMS ABOVE ROOF

  • CPC § 2-5 Medium relevance — show source text

    CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

    201 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

    202 General Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

    203 Occupancy Classification and Use . . . . . . . . . . . . . . . 2-40

    CHAPTER 3 GENERAL REQUIREMENTS. . . . . . . . . . . . . . . . 3-3

    301 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

    302 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

    303 Asphalt Kettles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 304 Combustible Waste Material . . . . . . . . . . . . . . . . . . . . . .3-4

    305 Ignition Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6 306 Motion Picture Projection Rooms and Film . . . . . . . . .3-7 307 Open Burning, Recreational Fires and Portable Outdoor Fireplaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7 308 Open Flames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7 309 Powered Industrial Trucks and Equipment . . . . . . . . .3-9 310 Smoking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 311 Vacant Premises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

    312 Vehicle Impact Protection . . . . . . . . . . . . . . . . . . . . . . 3-12 313 Fueled Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 314 Indoor Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 315 General Storage .

  • CPC § 106.0 Medium relevance — show source text

    106.0 Violations and Penalties . . . . . . . . .25

    106.1 General . . . . . . . . . . . . . . . . . . . . . .25

    106.2 Notices of Correction or Violation . . .25

    106.3 Penalties . . . . . . . . . . . . . . . . . . . . .26

    106.4 Stop Orders . . . . . . . . . . . . . . . . . .26

    106.5 Authority to Disconnect Utilities in Emergencies . . . . . . . . .26

    106.6 Authority to Condemn . . . . . . . . . . .26

    107.0 Board of Appeals . . . . . . . . . . . . . .26

    107.1 General . . . . . . . . . . . . . . . . . . . . . .26

    107.2 Limitations of Authority . . . . . . . . . .26

    Table 104.5 Plumbing Permit Fees . . . . . . . . . .27

    CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . .29

    201.0 General . . . . . . . . . . . . . . . . . . . . . .31

    201.1 Applicability . . . . . . . . . . . . . . . . . . .31

    202.0 Definition of Terms . . . . . . . . . . . . .31

    202.1 General . . . . . . . . . . . . . . . . . . . . . .31

    CHAPTER 3 GENERAL REGULATIONS . . . . . .47

    301.0 General . . . . . . . . . . . . . . . . . . . . . .49

    301.1 Applicability . . . . . . . . . . . . . . . . . . .49

    301.2 Minimum Standards . . . . . . . . . . . .49

    301.3 Alternate Materials and Methods

    of Construction Equivalency . . . . . .49

    301.4 Flood Hazard Areas . . . . . . . . . . . .49

    301.5 Alternative Engineered Design . . . .50

    301.6 Tall Wood (Mass Timber) Buildings . . . . . . . . . . . . . . . . . . . . .50

    301.7 One- and Two-Family Dwellings . .50

    301.8 OSHPD 1R . . . . . . . . . . . . . . . . . . .50

    302.0 Iron Pipe Size (IPS) Pipe . . . . . . . .50

    302.1 General . . . . . . . . . . . . . . . . . . . . . .50

    303.0 Disposal of Liquid Waste . . . . . . . .50

    303.1 General . . . . . . . . . . . . . . . . . . . . . .50

    304.0 Connections to Plumbing System Required . . . . . . . . . . . . . .50

    304.1 General . . . . . . . . . . . . . . . . . . . . . .50

    305.0 Damage to Drainage System or Public Sewer . . . . . . . . . . . . . . .51

  • CPC § 1-31 Medium relevance — show source text

    114 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

    115 Unsafe Structures and Equipment . . . . . . . . . . . . . . 1-31

    116 Emergency Measures . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

    117 Demolition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

    CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

    201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

    202 General Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

    CHAPTER 3 PROVISIONS FOR ALL COMPLIANCE

    METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

    301 Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

    302 General Provisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

    303 Storm Shelters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

    304 Structural Design Loads and Evaluation and Design Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

    305 In-Situ Load Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

    306 Accessibility for Existing Buildings . . . . . . . . . . . . . . . 3-6

    307 Smoke Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

    308 Carbon Monoxide Detection . . . . . . . . . . . . . . . . . . . . . 3-6

    309 Additions and Replacements of Exterior Wall Coverings and Exterior Wall Envelopes . . . . . . . . . 3-7

    310 [OSHPD 1R, 2 and 5] Services/Systems and Utilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

    311 [OSHPD 1R, 2 and 5] Means of Egress . . . . . . . . . . . . . . . 3-7

  • CPC § 1-33 Medium relevance — show source text

    112 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

    113 Means of Appeals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

    114 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34

    115 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34

    CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

    201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

    202 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

    CHAPTER 3 OCCUPANCY CLASSIFICATION AND USE . . . . .3-1

    301 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

    302 Occupancy Classification and Use Designation . . . . 3-3

    303 Assembly Group A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

    304 Business Group B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

    305 Educational Group E . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

    306 Factory Group F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

    307 High-Hazard Group H . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

    308 Institutional Group I . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

    309 Mercantile Group M. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

    310 Residential Group R. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

    311 Storage Group S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

    312 Utility and Miscellaneous Group U . . . . . . . . . . . . . . 3-18

    313 Laboratories Group L [SFM]. . . . . . . . . . . . . . . . . . . . . . .3-19

  • CPC § 304.8 Medium relevance — show source text

    The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.|For SI: 1 foot = 304.8 mm.
    a. The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.|For SI: 1 foot = 304.8 mm.
    a. The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.|For SI: 1 foot = 304.8 mm.
    a. The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.|For SI: 1 foot = 304.8 mm.
    a. The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.|

    TABLE 5601.8.1(3)—APPLICATION OF QUANTITY-DISTANCE (Q-D) TABLES—DIVISION 1.4 EXPLOSIVESa, b, c Col2 Col3 Col4 Col5
    ITEM MAGAZINE OPERATING BUILDING INHABITED BUILDING PUBLIC TRAFFIC ROUTE
    Inhabited building IBD in Table 5604.5.2(3) IBD in Table 5604.5.2(3) Not Applicable Not Applicable
    Magazine IMD in Table 5604.5.2(3) ILD or IPD in
    Table 5604.5.2(3)    		 IBD in Table 5604.5.2(3) PTR in Table 5604.5.2(3)
    Operating building ILD or IPD in
    Table 5604.5.2(3)    		 ILD or IPD in
    Table 5604.5.2(3)    		 IBD in Table 5604.5.2(3) PTR in Table 5604.5.2(3)
    Public traffic route PTR in Table 5604.5.2(3) PTR in Table 5604.5.2(3) Not Applicable Not Applicable
    For SI: 1 foot = 304.8 mm.
    a. The minimum separation distance shall be not less than 50 feet.
    b. Linear interpolation between tabular values in the referenced Q-D table shall not be allowed.
    c. For definitions of quantity-distance abbreviations IBD, ILD, IMD, IPD and PTR, see Chapter 2.    		 For SI: 1 foot = 304.8 mm.
    a.
  • CPC § 1-5 Medium relevance — show source text

    102 Construction Documents

    and Installation Verification . . . . . . . . . . . . . . . . . . . .1-5

    103 Building Standards Commission. . . . . . . . . . . . . . . . . . .1-5 104 Department of Housing and Community Development. . . . . . . . . . . . . . . . . .1-6 105 Division of the State Architect . . . . . . . . . . . . . . . . . . . . .1-6

    106 Office of Statewide Health Planning and Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

    CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

    201 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

    202 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

    CHAPTER 3 GREEN BUILDING . . . . . . . . . . . . . . . . . . . . . . . . 3-3

    301 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

    302 Mixed Occupancy Buildings . . . . . . . . . . . . . . . . . . . . . . .3-4 303 Phased Projects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 304 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 305 CALGreen Tier 1 and CALGreen Tier 2 . . . . . . . . . . . . . .3-4

    306 Voluntary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

    CHAPTER 4 RESIDENTIAL MANDATORY MEASURES . . . . . . 4-3

    4.1 Planning and Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7 4.3 Water Efficiency and Conservation . . . . . . . . . . . . . . . . .4-9 4.4 Material Conservation and Resource Efficiency . . . . 4-11 4.5 Environmental Quality . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13

    CHAPTER 5 NONRESIDENTIAL MANDATORY MEASURES . . 5-3

  • CPC § 102.8 Medium relevance — show source text

    102.8 Appendices . . . . . . . . . . . . . . . . . . .21

    103.0 Duties and Powers of the

    Authority Having Jurisdiction . . . . .22

    103.1 General . . . . . . . . . . . . . . . . . . . . . .22

    103.2 Liability . . . . . . . . . . . . . . . . . . . . . .22

    103.3 Applications and Permits . . . . . . . .22

    103.4 Right of Entry . . . . . . . . . . . . . . . . .22

    104.0 Permits . . . . . . . . . . . . . . . . . . . . . .22

    104.1 Permits Required . . . . . . . . . . . . . .22

    104.2 Exempt Work . . . . . . . . . . . . . . . . .22

    104.3 Application for Permit . . . . . . . . . . .22

    104.4 Permit Issuance . . . . . . . . . . . . . . .23

    104.5 Fees . . . . . . . . . . . . . . . . . . . . . . . .24

    105.0 Inspections and Testing . . . . . . . . .24

    105.1 General . . . . . . . . . . . . . . . . . . . . . .24

    105.2 Required Inspections . . . . . . . . . . .24

    105.3 Testing of Systems . . . . . . . . . . . . .25

    105.4 Connection to Service Utilities . . . .25

    106.0 Violations and Penalties . . . . . . . . .25

    106.1 General . . . . . . . . . . . . . . . . . . . . . .25

    106.2 Notices of Correction or Violation . . .25

    106.3 Penalties . . . . . . . . . . . . . . . . . . . . .26

    106.4 Stop Orders . . . . . . . . . . . . . . . . . .26

    106.5 Authority to Disconnect Utilities in Emergencies . . . . . . . . .26

    106.6 Authority to Condemn . . . . . . . . . . .26

    107.0 Board of Appeals . . . . . . . . . . . . . .26

    107.1 General . . . . . . . . . . . . . . . . . . . . . .26

    107.2 Limitations of Authority . . . . . . . . . .26

    Table 104.5 Plumbing Permit Fees . . . . . . . . . .27

    CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . .29

    201.0 General . . . . . . . . . . . . . . . . . . . . . .31

    201.1 Applicability . . . . . . . . . . . . . . . . . . .31

    202.0 Definition of Terms . . . . . . . . . . . . .31

    202.1 General . . . . . . . . . . . . . . . . . . . . . .31

    CHAPTER 3 GENERAL REGULATIONS . . . . . .47

  • CPC § 1-26 Medium relevance — show source text

    108 Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

    109 Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

    110 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

    111 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

    112 Means of Appeals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28 113 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

    114 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29 115 Unsafe Structures or Equipment. . . . . . . . . . . . . . . . . 1-29

    CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

    201 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

    202 General Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

    203 Occupancy Classification and Use . . . . . . . . . . . . . . . 2-40

    CHAPTER 3 GENERAL REQUIREMENTS. . . . . . . . . . . . . . . . 3-3

    301 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

    302 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

    303 Asphalt Kettles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 304 Combustible Waste Material . . . . . . . . . . . . . . . . . . . . . .3-4

  • CPC § 1-22 Medium relevance — show source text

    PART 2—ADMINISTRATION AND ENFORCEMENT . . . . . . . . . . . 1-22

    103 Code Compliance Agency . . . . . . . . . . . . . . . . . . . . . . 1-22

    104 Duties and Powers of Code Official. . . . . . . . . . . . . . 1-22

    105 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

    106 Construction Documents . . . . . . . . . . . . . . . . . . . . . . 1-26

    107 Temporary Uses, Equipment and Systems. . . . . . . 1-28

    108 Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

    109 Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

    110 Certificate of Occupancy. . . . . . . . . . . . . . . . . . . . . . . 1-30

    111 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

    112 Means of Appeals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

    113 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

    114 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

    115 Unsafe Structures and Equipment . . . . . . . . . . . . . . 1-31

    116 Emergency Measures . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

    117 Demolition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

    CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

    201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

    202 General Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

    CHAPTER 3 PROVISIONS FOR ALL COMPLIANCE

    METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

    301 Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

  • CPC § 422.1 Medium relevance — show source text

    PLUMBING FIXTURES AND FIXTURE FITTINGS

    TABLE 422.1 MINIMUM PLUMBING FACILITIES [1]

    Each building shall be provided with sanitary facilities, including provisions for persons with disabilities as prescribed by the Department Having Jurisdiction [8] . Table 422.1 applies to new buildings, additions to a building, and changes of occupancy or type in an existing building resulting in increased occupant

    load.

    For requirements for persons with disabilities, Chapter 11A or 11B of the California Building Code shall be used .

    [BSC & DSA-SS] The total occupant load shall be determined in accordance with the California Building Code or Table 4-1 Occupant Load Factor.

    Exceptions: (1) [HCD 1-AC & HCD 2] For applications listed in Sections 1.8.2.1.2 and 1.8.2.1.3 regulated by the Department of Housing and Community Development, each building shall be provided with sanitary facilities, including provisions for persons with disabilities as prescribed by the Department. Covered mul- tifamily dwellings required to be accessible to persons with disabilities shall comply with Chapter 11A of the California Building Code. Permanent build- ings in mobilehome parks and special occupancy parks required to be accessible by persons with disabilities, shall comply with Chapter 11B of the California Building Code. (2) [HCD 1] For limited density owner-built rural dwelling sanitary facilities, the type, design and number of facilities as required and approved by the local health official shall be provided to the dwelling sites. It shall not be required that such facilities be located within the dwelling.

    TYPE OF
    OCCUPANCY2    		 WATER CLOSETS
    (FIXTURES PER PERSON)3    		 Col3 URINALS
    (FIXTURES
    PER
    PERSON)4    		 LAVATORIES
    (FIXTURES PER PERSON)5    		 Col6 BATHTUBS
    OR
    SHOWERS
    (FIXTURES
    PER
    PERSON)    		 DRINKING
    FOUNTAINS/
    FACILITIES
    (FIXTURES
    PER
    PERSON)    		 OTHER6, 7
    A-1 Assembly occupancy
    (fixed or permanent seat-
    ing)- theaters, concert
    halls, and auditoriums    		 Male
    1: 1-100
    2: 101-200
    3: 201-400    		 Female
    1: 1-25
    2: 26-50
    3: 51-100
    4: 101-200
    6: 201-300
    8: 301-400    		 Male
    1: 1-200
    2: 201-300
    3: 301-400
    4: 401-600    		 Male
    1: 1-200
    2: 201-400
    3: 401-600
    4: 601-750    		 Female
    1: 1-100
    2: 101-200
    4: 201-300
    5: 301-500
    6: 501-750    		 ––
    		 1: 1-250
    2: 251-500
    3: 501-750    		 1 service
    sink or
    laundry sink
    A-1 Assembly occupancy
    (fixed or permanent seat-
    ing)- theaters,
  • CPC § 1.11.0. Medium relevance — show source text

    0||||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.

    2025 CALIFORNIA PLUMBING CODE 29

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

    30 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 2

    DEFINITIONS

    201.0 General.

    201.1 Applicability. For the purpose of this code, the following terms have the meanings indicated in this chapter.

    No attempt is made to define ordinary words, which are used in accordance with their established dictionary meanings, except where a word has been used loosely, and it is necessary to define its meaning as used in this code to avoid misunderstanding.

    202.0 Definition of Terms.

    202.1 General. The definitions of terms are arranged alphabetically according to the first word of the term.

    203.0 – A –

    ABS. Acrylonitrile-butadiene-styrene. Accepted Engineering Practice. That which conforms to technical or scientific-based principles, tests, or standards that are accepted by the engineering profession. Accessible. Where applied to a fixture, connection, appliance, or equipment, “accessible” means having access thereto, but which first may require the removal of an access panel, door, or similar obstruction. Accessible, Readily. Having a direct access without the necessity of removing a panel, door, or similar obstruction. Accessory Dwelling Unit. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more per- sons and is located on a lot with a proposed or existing pri- mary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking, and sanitation on the same parcel as the single-family or mul- tifamily dwelling is or will be situated. (See Government Code Section 65852.2.) Air Break. A physical separation which may be a low inlet into the indirect waste receptor from the fixture, appliance, or device indirectly connected. Air Gap, Drainage. The unobstructed vertical distance through the free atmosphere between the lowest opening from a pipe, plumbing fixture, appliance, or appurtenance conveying waste to the flood-level rim of the receptor. Air Gap, Water Distribution. The unobstructed vertical distance through the free atmosphere between the lowest opening from a pipe or faucet conveying potable water to the flood-level rim of a tank, vat, or fixture.

    Alternate Water Source. Nonpotable source of water that includes but not limited to gray water, on-site treated nonpotable water, on-site treated nonpotable gray water, rainwater, and reclaimed (recycled) water. Anchors. See Supports. Anodeless Riser. An assembly of steel-cased plastic pipe used to make the transition between plastic piping installed

    underground and metallic piping installed aboveground.

    [NFPA 54:3.3.3] **Appliance.

Frequently asked questions

How do I know if a specific word (e.g., “trap”) is defined in Chapter 2?

Search Chapter 2 for the term. If a Chapter 2 entry exists, that is the controlling definition for the CPC; use it in permit documents and design calculations. § 201.1.

My project is regulated by another state agency — do Chapter 2 definitions still apply?

Yes — Chapter 2 definitions apply “for the purpose of this code,” but some entries show bracketed agency notes or references. If your facility is regulated by that agency, follow the Chapter 2 entry plus any agency-specific requirements it cites. § 201.1.

What if the term I need isn’t in Chapter 2?

If Chapter 2 doesn’t define it, use the ordinary (dictionary) meaning unless the CPC points to another referenced document that defines it. § 201.1.

Are definitions in Chapter 2 sometimes different from common trade usage?

Yes. If Chapter 2 defines a term, that definition supersedes trade or dictionary usage for CPC compliance. Always use the Chapter 2 wording where present. § 201.1.

Where are definitions listed within Chapter 2?

Definitions are arranged alphabetically by the first word of the defined term to make lookup straightforward. § 202.1.

More in California Plumbing Code

Ask about the CPC

Get cited, plain-English answers on the California Plumbing Code for your project — any code section, any scenario.

Start Free Trial

Related in the CPC

How to use defined terms when interpreting CPC provisions

When are terms from other California codes used?

Scope & Applicability of CPC Definitions

California Plumbing Code