CPC · California Plumbing Code

What are the installation, testing, disinfection, and pump requirements?

New and repaired potable water piping must be properly installed, tested, and disinfected before use; pumps must be accessible and meet potable‑water standards; booster pumps require a low‑pressure cutoff set ≥10 psi within 5 ft of the inlet; hot water pipes require minimum insulation thickness per CPC § 609.0–609.12.

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Last reviewed: July 6, 2026

What the code requires — plain English

The California Plumbing Code requires that potable water piping and related equipment be installed per the Code and manufacturer instructions, tested as required by the Authority Having Jurisdiction, disinfected before use (with prescribed chlorine concentrations and contact times), and that pumps and pump controls meet accessibility, material/standard, and safety-control requirements (including a low‑pressure cutoff for booster pumps). Key controlling sections are § 609.0, § 609.4, § 609.8, § 609.9, § 609.10, § 609.11, and § 609.12.

The single most important action: before placing a new or repaired potable water system into service, it must be flushed and disinfected in accordance with § 609.10 (specific ppm and contact-time options) and accepted by the Authority Having Jurisdiction.

Requirements in detail

Installation & location (§ 609.0 — § 609.6)

  • The Code groups installation, testing, unions, and location rules under § 609.0; specific location and lot-use rules (for building supply lines) appear in § 609.6 and § 609.7. These sections require building supply piping to be on the lot of the served building except in limited, authorized circumstances.
  • Unions: devices that require removal for service shall have unions installed close to the equipment per § 609.5.

Note: the previewed files show the sections and headings (609.0–609.7) but do not include every line of installation details in the preview; consult the Authority Having Jurisdiction or the full CPC text where needed.

Testing (§ 609.4)

  • The CPC includes a § 609.4 Testing item in the Water Supply and Distribution chapter (section heading shown in the Code table of contents). The file previews used here identify the testing section but do not reproduce its full text in the snippets available to this review, so the precise test pressures/media/time in § 609.4 cannot be quoted verbatim from the retrieved preview. Confirm the complete § 609.4 text from the full CPC or with the Authority Having Jurisdiction.

Related tests for other systems (example: building sewer testing procedures) are shown in other chapters/illustrated sections and illustrate the Code’s testing approach (e.g., water tests, camera inspection when required).

Disinfection of potable water systems (§ 609.10)

  • New or repaired potable water systems must be disinfected prior to use where required by the Authority Having Jurisdiction; an explicit set of methods and steps is provided in § 609.10.
  • Accepted procedure options in the Code preview (when a Health Authority method is not prescribed) include:
    • Flush the system with potable water until potable water appears at outlets.
    • Fill the system with a water‑chlorine solution of not less than 50 parts per million (ppm) chlorine and allow to stand 24 hours; OR fill with not less than 200 ppm and allow to stand 3 hours.
    • After the standing time, flush the system until the chlorine residual leaving the system does not exceed the residual in the flushing water.
    • Repeat if bacteriological tests show contamination. Disinfection must be completed no more than three weeks before beneficial occupancy, with additional flushing or re‑disinfection if occupancy is delayed.

Pumps and controls (§ 609.8 — § 609.9)

  • Pump installation: Pumps must be installed in accordance with the manufacturer’s installation instructions (see § 609.8).
  • Access: Pumps shall be accessible for repairs (§ 609.8.1).
  • Potable‑water pump material/standard: Pumps intended to supply drinking water must conform to NSF/ANSI/CAN 61 (§ 609.8.2).
  • Hot‑water recirculation: There is an express provision for hot‑water recirculating pumps used in healthcare, long‑term care, hotels or motels in § 609.8.3 (no requirement for automatic turn‑off devices in those occupancies as noted).
  • Low‑pressure cutoff for booster pumps: Where a booster pump (except fire pumps) is connected to a building supply or underground water pipe, install a low‑pressure cutoff switch on the inlet side not more than 5 feet (1524 mm) from the inlet; set the cutoff at not less than 10 psi (69 kPa). A pressure gauge is required between the shutoff valve and the pump (§ 609.9).

Water hammer and arresters (§ 609.11)

  • Systems with quick‑acting valves must be provided with water‑hammer arresters to absorb transient pressures (arresters must comply with ASSE 1010 or PDI‑WH 201 and be installed as close as possible to quick‑acting valves). The Code also notes adoption exceptions in some jurisdictions (for example, a "[Not adopted by HCD]" note appears for § 609.11 in the preview). Follow manufacturer location/installation specs when listed devices are used.

Pipe insulation — domestic hot water (§ 609.12) and CEC references

  • Insulation required: Domestic hot water piping must be insulated per § 609.12.1.
  • Minimum insulation thickness:
    • For pipe up to 2 inches (50 mm) diameter: insulation wall thickness shall be not less than the diameter of the pipe.
    • For pipe 2 inches (50 mm) or more: insulation wall thickness shall be not less than 2 inches (51 mm). (See § 609.12.2.)
  • Exceptions: piping that penetrates framing members, and hot water piping between fixture control valve/supply stop and the fixture/appliance, are excepted from insulation requirements.
  • CEC coordination: § 609.12.3 references the California Energy Code (CEC) — e.g., Sections 150.0(j)2 and 120.3(c) — for additional pipe insulation requirements tied to fluid temperature and diameter and for details such as insulation abutting framing and penetrations.

Decision‑relevant values (quick reference table)

Requirement / threshold Value / Action Code Reference
Booster pump low‑pressure cutoff distance ≤ 5 ft (1524 mm) from pump inlet § 609.9.
Booster pump cutoff setpoint ≥ 10 psi (69 kPa) § 609.9.
Potable‑water pump standard NSF/ANSI/CAN 61 § 609.8.2.
Pump accessibility Pumps must be accessible for repairs § 609.8.1.
Disinfection — option A 50 ppm chlorine, stand 24 hours § 609.10(2).
Disinfection — option B 200 ppm chlorine, stand 3 hours § 609.10(2).
Disinfection timing before occupancy Complete ≤ 3 weeks before occupancy; reflush/disinfect if delayed per details in § 609.10 § 609.10(5).
Hot‑water pipe insulation thickness (≤2" pipe) Insulation wall thickness ≥ pipe diameter § 609.12.2.
Hot‑water pipe insulation thickness (≥2" pipe) Insulation wall thickness ≥ 2 in (51 mm) § 609.12.2.
Water hammer arrester standard ASSE 1010 or PDI‑WH 201 § 609.11.

Exceptions & special cases

  • The Code allows the Authority Having Jurisdiction to require or specify testing/disinfection methods; where a Health Authority prescribes a method, that method controls over the default steps in § 609.10. § 609.10 explicitly notes following the Health Authority method when provided.
  • Fire pumps are excluded from the booster‑pump low‑pressure cutoff requirement in § 609.9.
  • Some jurisdictions (e.g., HCD) may not adopt the water‑hammer arresters provision — the preview includes a "[Not adopted by HCD]" notation next to § 609.11. Confirm local adoption.
  • The Code references other chapters and standards for related topics (e.g., trenching, building supply materials, testing procedures for other systems, and CEC requirements for insulation). Follow those references for comprehensive compliance.

Common mistakes

  • Relying on manufacturer instructions for pump location but neglecting the Code‑required low‑pressure cutoff placement/setting for booster pumps (§ 609.9).
  • Failing to disinfect a newly installed or repaired potable system, or using the wrong concentration/contact time (not following the 50 ppm/24 hr or 200 ppm/3 hr options in § 609.10).
  • Installing potable water pumps that are not certified to NSF/ANSI/CAN 61.
  • Omitting pipe insulation or installing insufficient wall thickness compared to the minimums in § 609.12.2; or assuming building insulation alone satisfies the Code without checking CEC cross‑references.
  • Not providing access for pump repairs as required by § 609.8.1.

Worked example — small commercial booster pump & new potable piping

Scenario: A 3‑story office building installs a new underground building supply, a booster pump tied into the building supply, and new interior potable distribution piping.

Steps and how the Code applies:

  1. Location: Confirm the building supply is located on the same lot or authorized per § 609.6 / § 609.7.
  2. Pump installation: Install the booster pump per manufacturer instructions, provide service access, and ensure pump materials/finish meet potable‑water requirements if applicable (NSF/ANSI/CAN 61) — § 609.8 and § 609.8.1–.2.
  3. Low‑pressure cutoff: Install a low‑pressure cutoff switch on the pump inlet within 5 ft (1524 mm) of the inlet and set it to no less than 10 psi (69 kPa). Install a pressure gauge between the shutoff valve and the pump (per § 609.9). Example numeric settings: cutoff at 10 psi; gauge reads upstream pressure for verification.
  4. Interior piping: After installation, plan for testing as required (see § 609.4 heading). Because the previewed text for § 609.4 is not fully available here, coordinate with the Authority Having Jurisdiction to confirm required test pressure and media.
  5. Disinfection: Before occupancy, disinfect the interior potable piping. If you select the 50 ppm method: fill the system with 50 ppm chlorine, valve off, and allow 24 hours contact; then flush until chlorine residual leaving the system is no greater than the residual in the flushing water. Complete disinfection no more than 3 weeks before occupancy (repeat if occupancy is delayed as specified in § 609.10).
  6. Insulation: Insulate domestic hot water piping. If the largest hot water branch is 1-1/2 in copper, provide insulation wall thickness ≥ 1-1/2 in (i.e., equal to pipe diameter) under § 609.12.2 (or meet CEC if more restrictive).
  7. Water hammer: If quick‑acting valves (solenoid or motorized valves) are installed, locate arresters as close as possible to the valves and use devices complying with ASSE 1010 or PDI‑WH 201 per § 609.11. Confirm local adoption.

Related provisions (useful cross‑references)

  • § 609.5 — Unions near regulating equipment/serviceable devices.
  • § 610.0 – § 610.9 — Size of potable water piping and pressure loss considerations (sizing, friction, meter sizing).
  • § 1502.3 / § 1506.6 — Cross‑connection testing and initial cross‑connection test procedures for alternate water sources (relevant where potable and non‑potable systems interact).
  • California Energy Code references cited in § 609.12.3 — e.g., CEC Sec. 150.0(j)2 and 120.3(c) for pipe insulation rules.
  • Referenced standards for pumps and devices (NSF/ANSI/CAN 61, ASSE 1010, PDI‑WH 201) are shown in the Code references and tables.

Code references

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

  • CPC § 609.8 High relevance — show source text

    A copy of the instrument recording such proceedings shall be filed with the Authority Having Jurisdiction.

    609.8 Pumps. Pumps shall be installed in accordance with the manufacturer’s installation instructions.

    2025 CALIFORNIA PLUMBING CODE 155

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    WATER SUPPLY AND DISTRIBUTION

    609.8.1 Access. Pumps shall be accessible for repairs. 609.8.2 Potable Water Pumps. Pumps intended to supply drinking water shall be in accordance with NSF/ANSI/CAN 61.

    609.8.3 Hot-Water Recirculating Pumps. For healthcare facilities, long term care facilities, hotels, or motels, devices that automatically turn off the recirculation pump(s) shall not be required. 609.9 Low-Pressure Cutoff Required on Booster Pumps for Water Distribution Systems. Where a booster pump (excluding a fire pump) is connected to a building supply or underground water pipe, a low-pressure cutoff switch on the inlet side of the pump shall be installed not more than 5 feet (1524 mm) of the inlet. The cutoff switch shall be set for not less than 10 psi (69 kPa). A pressure gauge shall be installed between the shutoff valve and the pump. 609.10 Disinfection of Potable Water System. New or repaired potable water systems shall be disinfected prior to use where required by the Authority Having Jurisdiction.

    [OSHPD 1, 1R, 2, 3, 4 & 5] Prior to utilization of newly constructed or altered potable water piping systems, all affected potable water piping shall be disinfected using pro- cedures prescribed in California Plumbing Code Sections 609.10(1) through 609.10(5). The method to be followed shall be that prescribed by the Health Authority or, in case no method is prescribed by it, the following: (1) The pipe system shall be flushed with clean, potable water until potable water appears at the points of the outlet. (2) The system or parts thereof shall be filled with a waterchlorine solution containing not less than 50 parts per million of chlorine, and the system or part thereof shall be valved-off and allowed to stand for 24 hours; or, the system or part thereof shall be filled with a water-chlorine solution containing not less than 200 parts per million of chlorine and allowed to stand for 3 hours.

    (3) Following the allowed standing time, the system shall be flushed with clean, potable water until the chlorine residual in the water coming from the system does not exceed the chlorine residual in the flushing water.

    (4) The procedure shall be repeated where it is shown by a bacteriological examination made by an approved agency that contamination persists in the system. (5) [OSHPD 1, 1R, 2, 3, 4 & 5] Disinfection shall be com- pleted no more than three weeks before whole or partial beneficial occupancy.

    (a) Where occupancy is delayed two weeks from disin- fection, flushing of all fixtures shall again be com- pleted.

  • CPC § 609.5 High relevance — show source text

    609.5 Unions. Unions shall be installed in the water supply piping not more than 12 inches (305 mm) of regulating equipment, water heating, conditioning tanks, and similar equipment that requires service by removal or replacement in a manner that will facilitate its ready removal.

    609.6 Location. Except as provided in Section 609.7, no building supply shall be located in a lot other than the lot that is the site of the building or structure served by such building supply.

    609.7 Abutting Lot. Nothing contained in this code shall be construed to prohibit the use of an abutting lot to:

    (1) Provide access to connect a building supply to an available public water service where proper cause and legal easement not in violation of other requirements have been first established to the satisfaction of the Authority Having Jurisdiction.

    (2) Provide additional space for a building supply where the proper cause, transfer of ownership, or change of boundary not in violation of other requirements have been first established to the satisfaction of the Authority Having Jurisdiction. The instrument recording such action shall constitute an agreement with the Authority Having Jurisdiction, which shall clearly state and show that the areas so joined or used shall be maintained as a unit during the time they are so used. Such an agreement shall be recorded in the office of the County Recorder as a part of the conditions of ownership of said properties, and shall be binding on heirs, successors, and assigns to such properties. A copy of the instrument recording such proceedings shall be filed with the Authority Having Jurisdiction.

    609.8 Pumps. Pumps shall be installed in accordance with the manufacturer’s installation instructions.

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    WATER SUPPLY AND DISTRIBUTION

    609.8.1 Access. Pumps shall be accessible for repairs. 609.8.2 Potable Water Pumps. Pumps intended to supply drinking water shall be in accordance with NSF/ANSI/CAN 61.

    609.8.3 Hot-Water Recirculating Pumps. For healthcare facilities, long term care facilities, hotels, or motels, devices that automatically turn off the recirculation pump(s) shall not be required. 609.9 Low-Pressure Cutoff Required on Booster Pumps for Water Distribution Systems. Where a booster pump (excluding a fire pump) is connected to a building supply or underground water pipe, a low-pressure cutoff switch on the inlet side of the pump shall be installed not more than 5 feet (1524 mm) of the inlet. The cutoff switch shall be set for not less than 10 psi (69 kPa). A pressure gauge shall be installed between the shutoff valve and the pump. 609.10 Disinfection of Potable Water System. New or repaired potable water systems shall be disinfected prior to use where required by the Authority Having Jurisdiction.

  • CPC § 601.2 High relevance — show source text

    2 Exceptions_3 & 4_||X||X|X|||||||||||||||||||| |601.2 Exceptions_4, 5 & 6_||||||||||||||||||||X||||| |601.2 Exception_5_||X||||||||||||||||||||||| |601.2.1||||X||||||||||||||||||||| |601.2.1.1||||X||||||||||||||||||||| |601.2.1.2||||X||||||||||||||||||||| |601.3.2||||X|X|||||||||||||||||||| |601.3.3||X||X||||||||||||||||||||| |601.3.3 Exception||||||||||||||||||||X||||| |601.4||||||||||||||||||||||X||| |601.5|||||||||||||||||||X|||||| |601.6|||||||||||||||||||X|||||| |601.7|||||||||||||||||||X|||||| |601.8|||||||||||||||||||X|||||| |603.5.11||||X|X|||||||||||||||||||| |603.5.14_, Note_|||X|||||X||||||||||||||||| |604.1 Exception||||||||||X||X|X|X|X|||||||||| |Table 604.1 & Notes_3 - 5_|X|||X|X|||X||||||||||X|X|||||| |604.1.1||||X|X|||||||||||||||||||| |604.1.2||||X|X|||X||||||||||||||||| |604.2_Note_|X|||X|X|||||||||||||||||||| |604.13|X|||X|X|||||||||||||||||||| |605.2.2||||X|X|||||||||||||||||||| |605.9|X|||X|X|||X||X|X|X|X|X|X|||X|X|||||| |605.9.1|X|||X|X|||X||X|X|X|X|X|X|||X|X|||||| |605.10|X|||X|X|||X||||||||||||||||| |605.10.1|X|||||||||||||||||||||||| |605.10.1.1|X|||||||||||||||||||||||| |605.12.2||||X|X|||||||||||||||||||| |605.15||||X|X|||X||X|X|X|X|X|X|||||||||| |606.8||||||||||X|X|X|X|X|X|||||||||| |609.

  • CPC § 609.10 High relevance — show source text

    [OSHPD 1, 1R, 2, 3, 4 & 5] Prior to utilization of newly constructed or altered potable water piping systems, all affected potable water piping shall be disinfected using pro- cedures prescribed in California Plumbing Code Sections 609.10(1) through 609.10(5). The method to be followed shall be that prescribed by the Health Authority or, in case no method is prescribed by it, the following: (1) The pipe system shall be flushed with clean, potable water until potable water appears at the points of the outlet. (2) The system or parts thereof shall be filled with a waterchlorine solution containing not less than 50 parts per million of chlorine, and the system or part thereof shall be valved-off and allowed to stand for 24 hours; or, the system or part thereof shall be filled with a water-chlorine solution containing not less than 200 parts per million of chlorine and allowed to stand for 3 hours.

    (3) Following the allowed standing time, the system shall be flushed with clean, potable water until the chlorine residual in the water coming from the system does not exceed the chlorine residual in the flushing water.

    (4) The procedure shall be repeated where it is shown by a bacteriological examination made by an approved agency that contamination persists in the system. (5) [OSHPD 1, 1R, 2, 3, 4 & 5] Disinfection shall be com- pleted no more than three weeks before whole or partial beneficial occupancy.

    (a) Where occupancy is delayed two weeks from disin- fection, flushing of all fixtures shall again be com- pleted.

    (b) Where occupancy is delayed four weeks after disin- fection, disinfection and flushing shall again be com- pleted. 609.11 Water Hammer. [Not adopted by HCD] Building water supply systems where quick-acting valves are installed shall be provided with water hammer arrester(s) to absorb high pressures resulting from the quick closing of these valves. Water hammer arresters shall be approved mechanical devices that comply with ASSE 1010 or PDI-WH 201 and shall be installed as close as possible to quick-acting valves.

    609.11.1 Mechanical Devices. Where listed mechanical devices are used, the manufacturer’s specifications as to location and method of installation shall be followed.

    609.12 Pipe Insulation. Insulation of domestic hot water piping shall be in accordance with Section 609.12.1 and Section 609.12.2.

    609.12.1 Insulation Requirements. Domestic hot water piping shall be insulated. 609.12.2 Pipe Insulation Wall Thickness. Hot water pipe insulation shall have a minimum wall thickness of not less than the diameter of the pipe for a pipe up to 2 inches (50 mm) in diameter. Insulation wall thickness shall be not less than 2 inches (51 mm) for a pipe of 2 inches (50 mm) or more in diameter. Exceptions: (1) Piping that penetrates framing members shall not be required to have pipe insulation for the distance of the framing penetration. (2) Hot water piping between the fixture control valve or supply stop and the fixture or appliance shall not be required to be insulated. 609.12.3 California Energy Code Pipe Insulation _**Requirements.

  • CPC § 607.2 High relevance — show source text

    607.2 Private Well Water Tanks . . . . . . .154

    607.3 Potable Water Tanks . . . . . . . . . .154

    607.4 Venting . . . . . . . . . . . . . . . . . . . . .154

    607.5 Overflow . . . . . . . . . . . . . . . . . . . .154

    607.6 Valves . . . . . . . . . . . . . . . . . . . . . .154

    608.0 Water Pressure, Pressure Regulators, Pressure Relief Valves, and Vacuum Relief

    Valves . . . . . . . . . . . . . . . . . . . . . .154

    608.1 Inadequate Water Pressure . . . . .154

    608.2 Excessive Water Pressure . . . . . .154

    608.3 Expansion Tanks, and Combination Temperature and Pressure-Relief Valves . . . . .154

    608.4 Pressure Relief Valves . . . . . . . . .154

    608.5 Discharge Piping . . . . . . . . . . . . .154

    608.6 Water-Heating Devices . . . . . . . . .155

    608.7 Vacuum Relief Valves . . . . . . . . .155

    609.0 Installation, Testing, Unions, and Location . . . . . . . . . . . . . . . . .155

    609.1 Installation . . . . . . . . . . . . . . . . . .155

    609.2 Trenches . . . . . . . . . . . . . . . . . . . .155

    609.3 Under Concrete Slab . . . . . . . . . .155

    609.4 Testing . . . . . . . . . . . . . . . . . . . . .155

    609.5 Unions . . . . . . . . . . . . . . . . . . . . .155

    609.6 Location . . . . . . . . . . . . . . . . . . . .155

    609.7 Abutting Lot . . . . . . . . . . . . . . . . .155

    609.8 Pumps . . . . . . . . . . . . . . . . . . . . .155

    609.9 Low-Pressure Cutoff Required on Booster Pumps for Water Distribution Systems . . . . . . . . . . .156

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    TABLE OF CONTENTS

    609.10 Disinfection of Potable Water System . . . . . . . . . . . . . . . . . . . . .156

    609.11 Water Hammer . . . . . . . . . . . . . . .156

    609.12 Pipe Insulation . . . . . . . . . . . . . . .156

    610.0 Size of Potable Water Piping . . . .156

    610.1 Size . . . . . . . . . . . . . . . . . . . . . . . .156

    610.2 Pressure Loss . . . . . . . . . . . . . . . .156

    610.3 Quantity of Water . . . . . . . . . . . . .157

  • CPC § 609.4 High relevance — show source text

    609.4 Testing . . . . . . . . . . . . . . . . . . . . .155

    609.5 Unions . . . . . . . . . . . . . . . . . . . . .155

    609.6 Location . . . . . . . . . . . . . . . . . . . .155

    609.7 Abutting Lot . . . . . . . . . . . . . . . . .155

    609.8 Pumps . . . . . . . . . . . . . . . . . . . . .155

    609.9 Low-Pressure Cutoff Required on Booster Pumps for Water Distribution Systems . . . . . . . . . . .156

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    TABLE OF CONTENTS

    609.10 Disinfection of Potable Water System . . . . . . . . . . . . . . . . . . . . .156

    609.11 Water Hammer . . . . . . . . . . . . . . .156

    609.12 Pipe Insulation . . . . . . . . . . . . . . .156

    610.0 Size of Potable Water Piping . . . .156

    610.1 Size . . . . . . . . . . . . . . . . . . . . . . . .156

    610.2 Pressure Loss . . . . . . . . . . . . . . . .156

    610.3 Quantity of Water . . . . . . . . . . . . .157

    610.4 Sizing Water Supply and Distribution Systems . . . . . . . . . . .157

    610.5 Sizing per Appendices A, C, and M . . . . . . . . . . . . . . . . .157

    610.6 Friction and Pressure Loss . . . . . .157

    610.7 Conditions for Using Table 610.4 . . . . . . . . . . . . . . . . . .157

    610.8 Size of Meter and Building Supply Pipe Using Table 610.4 . .157

    610.9 Size of Branches . . . . . . . . . . . . .157

    610.10 Sizing for Flushometer Valves . . .157

    Table 610.10 Flushometer Fixture Units for Water Sizing Using Table 610.3 . . . . . . . . . . . . . . . . . .157

    Table 610.3 Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Sizes . . . . . . . . . . . .158

    Table 610.4 Fixture Unit Table for

    Determining Water Pipe and Meter Sizes . . . . . . . . . . . . . .159

    610.11 Sizing Systems for Flushometer Tanks . . . . . . . . . . . .160

    610.12 Sizing for Velocity . . . . . . . . . . . . .160

    610.13 Exceptions . . . . . . . . . . . . . . . . . .160

    611.0 Drinking Water Treatment Units . . . . . . . . . . . . . . . . . . . . . . .160

    611.1 Application . . . . . . . . . . . . . . . . . .160

  • CPC § 1502.3.2. High relevance — show source text

    (2) A potable water supply may be connected temporarily for the initial cross-connection test of the on-site treated non- potable gray water system as provided in Section 1502.3.2. 1506.5 Water Pressure. On-site treated non-potable gray water systems supplying water to water closets, urinals, and trap primers shall be capable of delivering not less than 15 pounds-force per square inch (psi) (103 kPa) residual pressure at the highest and most remote outlet served. Where the

    TABLE 1505.16 MINIMUM RECLAIMED (RECYCLED) WATER SOURCE TESTING, INSPECTION, AND MAINTENANCE FREQUENCY

    DESCRIPTION MINIMUM FREQUENCY*

    Inspect and clean filters and screens, and replace (where necessary). [Every 3 months.]

    Inspect pumps and verify operation. After initial installation and every 12 months thereafter.

    Inspect valves and verify operation. After initial installation and every 12 months thereafter.

    Inspect pressure tanks and verify operation. After initial installation and every 12 months thereafter.

    Clear debris from and inspect storage tanks, locking devices, and verify operation.

    After initial installation and every 12 months thereafter.

    Inspect caution labels and marking. After initial installation and every 12 months thereafter.

    * Note: Frequency is as described in this table, or more frequently as required by manufacturer’s instructions and/or the Authority Having Jurisdiction.

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    ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

    1506.10.3 Deactivation and Drainage. The on-site treated nonpotable gray water system and the potable water system within the building shall be provided with the required appurtenances (e.g., valves, air/vacuum relief valves, etc.) to allow for deactivation or drainage as required for a cross-connection test in accordance with Section 1502.3.

    1506.10.4 Near Underground Potable Water Pipe. On-site treated nonpotable gray water pipes shall be permitted to be run or laid in the same trench as potable water pipes with a 12 inch (305 mm) minimum vertical and horizontal separation where both pipe materials are approved for use within a building. Where piping materials do not meet this requirement the minimum separation shall be increased to 60 inches (1524 mm). The potable water piping shall be installed at an elevation above the on-site treated nonpotable gray water piping. 1506.10.5 Required Filters. A filter permitting the passage of particulates no larger than 100 microns (100 µm) shall be provided for on-site treated nonpotable gray water supplied to water closets, urinals, trap primers, and drip irrigation system s . 1506.10.6 Disinfection. Where the intended use of onsite treated nonpotable gray water requires disinfec- tion and/or other treatment, on-site treated nonpotable gray water shall be disinfected as needed to ensure the required water quality is obtained at the point of use. Where chlorine is used for disinfection or treatment, water shall be tested for residual chlorine in accordance with ASTM D1253.

  • CPC § 11B-89 High relevance — show source text

    11B-606 Lavatories and Sinks. . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-89

    11B-607 Bathtubs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-90

    11B-608 Shower Compartments . . . . . . . . . . . . . . . . . . . . . . . . .11B-92

    11B-609 Grab Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-96

    11B-610 Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-97

    11B-611 Washing Machines and Clothes Dryers. . . . . . . . . . .11B-98

    11B-612 Saunas and Steam Rooms . . . . . . . . . . . . . . . . . . . . . .11B-99

    DIVISION 7 – COMMUNICATION ELEMENTS AND

    FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-100

    11B-701 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-100

    11B-702 Fire Alarm Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-100

    11B-703 Signs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-100

    11B-704 Telephones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-107

    11B-705 Detectable Warnings and Detectable Directional

    Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-108

    11B-706 Assistive Listening Systems. . . . . . . . . . . . . . . . . . . . .11B-110

    11B-707 Automatic Teller Machines, Fare Machines and Point-of-Sale Devices . . . . . . . . . . . . . . . . . . . .11B-111

    11B-708 Two-Way Communication Systems. . . . . . . . . . . . .11B-112

    DIVISION 8 – SPECIAL ROOMS, SPACES AND ELEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-114

  • CPC § 1502.3.1 Medium relevance — show source text

    310 2025 CALIFORNIA PLUMBING CODE

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

    ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

    1502.3.1 Visual System Inspection. Before commencing the cross-connection testing, a dual system inspection shall be conducted by the Authority Having Jurisdiction and other authorities having jurisdiction as follows:

    (1) Meter locations of the alternate water source and potable water lines shall be checked to verify that no modifications were made and that no cross-con nections are visible.

    (2) Pumps and equipment, equipment room signs and exposed piping in equipment room shall be checked.

    (3) Valves shall be checked to ensure that the valve lock seals are still in place and intact. Valve control door signs shall be checked to verify that no signs have been removed.

    1502.3.2 Cross-Connection Test. A cross-connec- tion test shall be performed in the presence of the Authority Having Jurisdiction or other authorities having jurisdiction to determine whether a cross-connection has occurred as follows:

    (1) The potable water system shall be activated and pressurized. The alternate water source system shall be shut down, depressurized, and drained.

    (2) The potable water system shall remain pressurized for a minimum period specified by the Authority Having Jurisdiction while the alternate water source system is empty. The minimum period the alternate water source system is to remain depressurized shall be determined on a case-by-case basis, taking into account the size and complexity of the potable and the alternate water source distribution systems, but in no case shall that period be less than 1 hour.

    (3) The drain on the alternate water source system shall be checked for flow during the test and fixtures, potable and alternate water source, shall be tested and inspected for flow. Flow from an alternate water source system outlet indicates a cross-connection. No flow from a potable water outlet shall indicate that it is connected to the alternate water source sys tem.

    (4) The potable water system shall then be depressurized and drained.

    (5) The alternate water source system shall then be activated and pressurized. When an alternate water source is not available for the initial cross-connec- tion test, a temporary connection to a potable water supply shall be required. At the conclusion of the ini- tial cross-connection test, the temporary connection to the potable water supply shall be disconnected.

    (6) The alternate water source system shall remain pressurized for a minimum period 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.

    (7) Fixtures, potable, and alternate water source shall be tested and inspected for flow. Flow from a potable water system outlet indicates a cross-connection. No flow from an alternate water source outlet will indicate that it is connected to the potable water system.

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

    test.

  • CPC § 1506.10.3 Medium relevance — show source text

    1506.10.3 Deactivation and Drainage. The on-site treated nonpotable gray water system and the potable water system within the building shall be provided with the required appurtenances (e.g., valves, air/vacuum relief valves, etc.) to allow for deactivation or drainage as required for a cross-connection test in accordance with Section 1502.3.

    1506.10.4 Near Underground Potable Water Pipe. On-site treated nonpotable gray water pipes shall be permitted to be run or laid in the same trench as potable water pipes with a 12 inch (305 mm) minimum vertical and horizontal separation where both pipe materials are approved for use within a building. Where piping materials do not meet this requirement the minimum separation shall be increased to 60 inches (1524 mm). The potable water piping shall be installed at an elevation above the on-site treated nonpotable gray water piping. 1506.10.5 Required Filters. A filter permitting the passage of particulates no larger than 100 microns (100 µm) shall be provided for on-site treated nonpotable gray water supplied to water closets, urinals, trap primers, and drip irrigation system s . 1506.10.6 Disinfection. Where the intended use of onsite treated nonpotable gray water requires disinfec- tion and/or other treatment, on-site treated nonpotable gray water shall be disinfected as needed to ensure the required water quality is obtained at the point of use. Where chlorine is used for disinfection or treatment, water shall be tested for residual chlorine in accordance with ASTM D1253.

    1506.11 Valves. Valves, except fixture supply control valves, shall be equipped with a locking feature. 1506.12 Signs. Signs in buildings using on-site treated nonpotable gray water shall comply with Section s 1501.9, 1501.9.1 and 1501.9.2 and applicable requirements of the Cal- ifornia Building Code . 1506.13 Inspection and Testing. On-site treated nonpotable gray water systems shall be inspected and tested in accordance with Section 1502.1 and/or as required by the Authority Having Jurisdiction .

    »

    »

    »

    »

    »

    »

    »

    water pressure in the on-site treated non-potable gray water supply system within the building exceeds 80 psi (552 kPa), a pressure reducing valve reducing the pressure to 80 psi (552 kPa) or less to water outlets in the building shall be installed.

    1506.6 Initial Cross-Connection Test. A cross-connection test is required in accordance with Section 1502.3. Before the building is occupied or the system is activated, the installer shall perform the initial cross-connection test in the presence of the Authority Having Jurisdiction and other authorities having jurisdiction. The test shall be ruled successful by the Authority Having Jurisdiction before final approval is granted. 1506.7 On-Site Treated Nonpotable Gray Water Sys- tem Materials. On-site treated nonpotable gray water supply, and distribution system materials shall comply with the requirements of this code for potable water supply and distribution systems unless otherwise provided for in this section.

    1506.8 On-Site Treated Nonpotable Gray Water **Devices and Systems.

  • CPC § 6.10 Medium relevance — show source text

    84|6.10|6.30|6.61|6.84|7.00| |45|75|30|5.75|6.00|6.19|6.47|6.68|6.83| |44|75|31|5.67|5.91|6.08|6.34|6.53|6.67| |43|75|32|5.59|5.82|5.99|6.23|6.39|6.52| |42|75|33|5.51|5.74|5.90|6.12|6.27|6.39| |41|75|34|5.43|5.66|5.81|6.02|6.16|6.26| |46|80|34|5.43|5.66|5.81|6.02|6.16|6.26| |40|75|35|5.35|5.58|5.73|5.93|6.06|6.15| |45|80|35|5.35|5.58|5.73|5.93|6.06|6.15| |44|80|36|5.26|5.50|5.65|5.84|5.96|6.05| |43|80|37|5.16|5.42|5.57|5.76|5.87|5.96| |42|80|38|5.06|5.33|5.49|5.67|5.79|5.87| |41|80|39|4.95|5.24|5.41|5.60|5.71|5.78| |46|85|39|4.95|5.24|5.41|5.60|5.71|5.78| |40|80|40|4.83|5.14|5.32|5.52|5.63|5.70| |45|85|40|4.83|5.14|5.32|5.52|5.63|5.70| |44|85|41|4.69|5.04|5.253|5.43|5.55|5.62| |43|85|42|4.55|4.93|5.13|5.35|5.47|5.54| |42|85|43|4.38|4.80|5.03|5.26|5.38|5.46| |41|85|44|4.21|4.67|4.91|5.17|5.30|5.38| |40|85|45|4.01|4.52|4.79|5.06|5.20|5.29| |Condenser DT2|Condenser DT2|Condenser DT2|14.04|11.23|9.36|7.02|5.62|4.68| |1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2.

  • CPC § 11B-73 Medium relevance — show source text

    11B-502 Parking Spaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-73

    11B-503 Passenger Drop-Off and Loading Zones . . . . . . . . .11B-76

    11B-504 Stairways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-77

    11B-505 Handrails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-78

    DIVISION 6 – PLUMBING ELEMENTS AND FACILITIES. . . . 11B-81

    11B-601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-81

    11B-602 Drinking Fountains and Bottle-Filling Stations . . .11B-81

    11B-603 Toilet and Bathing Rooms . . . . . . . . . . . . . . . . . . . . . .11B-81

    11B-604 Water Closets and Toilet Compartments. . . . . . . . .11B-82

    11B-605 Urinals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-88

    11B-606 Lavatories and Sinks. . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-89

    11B-607 Bathtubs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-90

    11B-608 Shower Compartments . . . . . . . . . . . . . . . . . . . . . . . . .11B-92

    11B-609 Grab Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-96

    11B-610 Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11B-97

    11B-611 Washing Machines and Clothes Dryers. . . . . . . . . . .11B-98

    11B-612 Saunas and Steam Rooms . . . . . . . . . . . . . . . . . . . . . .11B-99

    DIVISION 7 – COMMUNICATION ELEMENTS AND

    FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-100

  • 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 § 4.6 Medium relevance — show source text

    Considerations are soil density; clearance from obstacles, utilities, and structures; location of bends, and water service locations. Excavations and shoring shall be in accordance with jurisdictional safety requirements. (c) Set Up Fuse the proper length of polyethylene pipe in accordance with ASTM F2620, or ASTM D3261 and fuse the end to a small length that is attached to the pulling head. A rod pusher cable is pushed through the damaged host pipe and attached to the pulling cable, which is then drawn through the pipe. The clevis end of the cable is attached to the pulling head. The pulling equipment is then set up according to the manufacturer’s instructions.

    (d) Pulling Pull the pulling head through. Once the pull is done, complete the connection to the existing piping.

    4.6 Cleanouts

    4.6.1 Plug Each cleanout fitting for cast-iron pipe shall consist of a cast-iron or brass body and an approved plug. Each cleanout for galvanized wrought-iron, galvanized steel, copper, or brass pipe shall consist of a brass plug as specified in Table 1, or a standard weight brass cap, or an approved ABS or PVC plastic plug, or an approved stainless-steel cleanout or plug. Plugs shall have raised square heads or approved countersunk rectangular slots. 4.6.2 Approved Each cleanout fitting and each cleanout plug, or cap shall be of an approved type.

    452 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 26

    4.6.3 Watertight and Gastight

    Cleanouts shall be designed to be watertight and gastight.

    5 Testing and Inspection Requirements

    5.1 Media

    The piping of the building sewer shall be tested with water. The Authority Having Jurisdiction shall be permitted to require the removal of cleanouts, etc., to ascertain whether the pressure has reached all parts of the system.

    5.2 Water Test

    The system shall be tested by plugging the end of the building sewer at its points of connection to the public sewer or private sewage disposal system and completely filling the building sewer with water from the lowest to the highest point thereof.

    5.3 Inspections

    The completed piping shall be internally inspected by camera unless waived by the Administrative Authority.

    TABLE 1

    CLEANOUTS (See Section 4.6.1)

    NPS SIZE OF CLEANOUT
    (inches)    		 THREADS PER INCH
    1.5 1.5 11.5


    2    		 1.5 11.5


    2.5    		 2.5 8

    3    		 2.5 8

    4 & larger    		 3.5 8

    Note: For SI units: 1 inch = 25 mm

    Uniform Plumbing Code References

    The following sections of the 2024 Uniform Plumbing Code apply.

    105.2 Required Inspections

    105.2.2 Other Inspections

    105.3 Testing of Systems

    301.2 Minimum Standards

    309.0 Workmanship

    312.0 Protection of Piping, Materials, and Structures

  • CPC § 1701.1 Medium relevance — show source text

    TABLE 1701.1 (continued) REFERENCED STANDARDS

    STANDARD NUMBER STANDARD TITLE APPLICATION REFERENCED
    SECTION
    ASTM D3261-2016 Standard Specification for Butt Heat Fusion Polyethylene (PE)
    Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing    		 Fittings Table 604.1
    ASTM D4068-2017 Standard Specification for Chlorinated Polyethylene (CPE)
    Sheeting for Concealed Water-Containment Membrane    		 Miscellaneous 408.8.2
    ASTM D4551-2017 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic
    Flexible Concealed Water-Containment Membrane    		 Miscellaneous 408.8.1
    ASTM D6104-1997
    (R2017)e1    		 Standard Practice for Determining the Performance of
    Oil/Water Separators Subjected to Surface Run-Off    		 Interceptors Table 1009.1
    ASTM E84-2021a Standard Test Method for Surface Burning Characteristics of
    Building Materials    		 Miscellaneous 701.2(2), 903.1(2),
    1101.4
    ASTM E119-2020 Standard Test Methods for Fire Tests of Building Construction
    and Materials    		 Miscellaneous 1404.3, 1405.3
    ASTM E814-2013a (R2017) Standard Test Method for Fire Tests of Penetration Firestop
    Systems    		 Miscellaneous 1404.3, 1405.3
    ASTM F409-2017 Standard Specification for Thermoplastic Accessible and
    Replaceable Plastic Tube and Tubular Fittings    		 Piping, Plastic 404.1
    ASTM F437-2021 Standard Specification for Threaded Chlorinated Poly (Vinyl
    Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM F438-2017 Standard Specification for Socket-Type Chlorinated Poly
    (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 40    		 Fittings Table 604.1
    ASTM F439-2019 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe Fittings, Schedule 80    		 Fittings Table 604.1
    ASTM F441/F441M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe, Schedules 40 and 80    		 Piping Table 604.1
    ASTM F442/F442M-2020 Standard Specification for Chlorinated Poly (Vinyl Chloride)
    (CPVC) Plastic Pipe (SDR-PR)    		 Piping Table 604.1, 605.2.2
    ASTM F493-2020 Standard Specification for Solvent Cements for Chlorinated
    Poly (Vinyl Chloride) (CPVC) Plastic Pipe and Fittings    		 Joints 605.2.2, 605.3.1
    ASTM F628-2012e3 Standard Specification for Acrylonitrile-Butadiene-Styrene
    (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe with a
    Cellular Core    		 Piping Table 701.2
    ASTM F656-2021 Standard Specification for Primers for Use in Solvent Cement
    Joints of Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings    		 Joints 605.2.
  • 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

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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 § 2.25 Medium relevance — show source text

    00|2.25|0.70|DR|3.70|1.05|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|33 mil cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|16|3.85|1.45|DR|DR|3.40|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|33 mil cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|24|3.40|DR|DR|DR|2.70|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|12|3.00|1.80|DR|DR|3.00|0.65|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|16|3.00|1.00|DR|DR|2.85|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|24|2.85|DR|DR|DR|2.20|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|12|4.00|3.85|2.80|1.80|4.00|3.05|1.50|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|16|4.00|3.30|1.95|0.60|4.00|2.25|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|24|4.00|2.25|DR|DR|4.00|0.65|DR|DR| |For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa.
    DR = Design Required, o.c. = on center.
    a. Wood furring shall be spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater.

  • California Plumbing Code Medium relevance — show source text

    735
    704
    676
    652|1390
    1320
    1270
    1220
    1170|2190
    2090
    2000
    1920
    1850|4560
    4350
    4160
    4000
    3850| |800
    850
    900
    950
    1000|800
    850
    900
    950
    1000|28
    27
    27
    26
    25|58
    57
    55
    53
    52|119
    115
    111
    108
    105|208
    201
    195
    189
    184|295
    285
    276
    268
    261|629
    609
    590
    573
    558|1130
    1100
    1060
    1030
    1000|1790
    1730
    1680
    1630
    1580|3720
    3600
    3490
    3390
    3300| |1100
    1200
    1300
    1400
    1500|1100
    1200
    1300
    1400
    1500|24
    23
    22
    21
    20|49
    47
    45
    43
    42|100
    95
    91
    88
    85|175
    167
    160
    153
    148|248
    237
    227
    218
    210|530
    505
    484
    465
    448|954
    910
    871
    837
    806|1500
    1430
    1

  • CPC § 0.0929 Medium relevance — show source text

    For SI units: 1 square foot = 0.0929 m [2], 1 cubic foot per minute = 0.00047 m [3] /s, 1 cubic foot per minute = 0.4719 L/s, 1 cubic foot per minute per square foot = 5.08 [(L/s)/m [2] ], 1 inch water gauge = 0.249 kPa

    Notes:

    1 When tested in accordance with AMCA 500D.

    2 Dampers smaller than 12 inches (305 mm) in height, width, or diameter need not be tested but shall be of the same design and construction as the smallest tested damper meeting the listed leakage rate requirement.

    3 Nonmotorized dampers smaller than 24 inches (610 mm) in height, width, or diameter shall be permitted to have a leakage rate of 40 CFM/ft 2 [0.203 (m 3 /s)/m 2 ].

    4 Where permitted by Section E 503.4.6.4.1, exception 2.

    2025 CALIFORNIA MECHANICAL CODE 425

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

    APPENDIX E

    (2) Systems serving zones where humidity levels are required to be maintained with precision of not more than ±5 percent relative humidity to comply with applicable codes or accreditation standards or as approved by the Authority Having Jurisdiction.

    [ASHRAE 90.1:6.4.3.6.2]

    E 503.4.6.7.3 Control Interlock. Where a zone is served by a system or systems with both humidification and dehumidification capability, means (such as limit switches, mechanical stops, or, for DDC systems, software programming) shall be provided capable of and configured to prevent simultaneous operation of humidification and dehumidification equipment. Exception: Systems serving zones where humidity levels are required to be maintained with precision of not more than ± 5 percent relative humidity to comply with applicable codes or accreditation standards or as approved by the Authority Having Jurisdiction. [ASHRAE 90.1:6.4.3.6.3]

    E 503.4.6.8 Freeze Protection and Snow or Ice Melting Systems. Freeze protection systems, such as heat tracing of outdoor piping and heat exchangers, including self-regulating heat tracing, shall include automatic controls capable of and configured to shut off the systems when outdoor air temperatures are more than 40°F (4°C) or when the conditions of the protected fluid will prevent freezing. Snow and ice melting systems shall include automatic controls capable of and configured to shut off the systems when the pavement temperature is more than 50°F (10°C) and no precipitation is falling, and an automatic or manual control that will allow shutoff when the outdoor temperature is more than 40°F (4°C) so that the potential for snow or ice accumulation is negligible. [ASHRAE 90.1:6.4.3.7] E 503.4.6.9 Ventilation Controls for High- **Occupancy Areas.

  • CPC § 1303.4.2 Medium relevance — show source text

    steamer.

    1303.4.2 Vapor Vents and Stacks. Where a sterilizer or bedpan steamer has provision for a vapor vent and such a vent is required by the manufacturer, the vent shall be extended to the outdoors above the roof. Sterilizer and bedpan steamer vapor vents shall be installed in accordance with the manufacturer’s installation instructions and shall not be connected to a drainage system vent.

    1303.5 Aspirators. Provisions for aspirators or other watersupplied suction devices shall be installed with the specific approval of the Authority Having Jurisdiction. Where aspirators are used for removing body fluids, they shall include a collection container to collect liquids and solid particles. Aspirators shall indirectly discharge to the sanitary drainage system through an air gap in accordance with Section 806.1. The potable water supply to an aspirator shall be protected by a vacuum breaker or equivalent backflow protection device in accordance with Section 603.5.9.

    1303.6 Drains. Drains shall be installed on dryers, aftercoolers, separators, and receivers.

    1303.7 Clinical Sinks. Clinical sinks shall be installed in

    accordance with the manufacturer’s installation instructions

    and shall comply with Section 1303.7.1.

    1303.7.1 Drainage Connection. Clinical sinks shall be directly connected to the sanitary drainage system and shall be provided with approved flushing devices installed in accordance with Section 413.1.

    1303.8 Water Supply for Hospitals. Hospitals shall be provided with not less than two approved potable water sources that are installed in such a manner as to prevent the interruption of water service.

    1303.9 Work Performed in Occupied Healthcare Facilities. In existing, occupied, inpatient healthcare facilities, all plumbing systems installation and remodel work shall be performed by personnel certified in accordance with ASSE/IAPMO/ANSI 12010.

    1304.0 Medical Gas and Medical Vacuum Piping Sys- tems.

    1304.1 General. The installation of medical gas and medical vacuum piping systems shall comply with the requirements of this chapter. 1304.1.1 [OSHPD 1, 1R, 2, 3, 4 & 5] Medical gas sys- tems for health care facilities that are regulated by OSHPD (hospitals, skilled nursing facilities, and intermediate care facilities, licensed clinics, and correctional treatment cen- ters) shall be in accordance with NFPA 99, Standard for Health Care Facilities. See California Fire Code Refer- enced Standards (Chapter 80) for applicable version of the Standard. See California Building Code Table 1224.4.6.1 for location and number of station outlets for oxygen, vac- uum, and medical air.

  • CPC § 909.12.4 Medium relevance — show source text

    [F] 909.12.4 Automatic control. Where completely automatic control is required or used, the automatic-control sequences shall be initiated from an appropriately zoned automatic sprinkler system complying with Section 903.3.1.1, manual controls provided with ready access for the fire department and any smoke detectors required by engineering analysis.

    [F] 909.13 Control air tubing. Control air tubing shall be of sufficient size to meet the required response times. Tubing shall be flushed clean and dry prior to final connections and shall be adequately supported and protected from damage. Tubing passing through concrete or masonry shall be sleeved and protected from abrasion and electrolytic action.

    [F] 909.13.1 Materials. Control-air tubing shall be hard-drawn copper, Type L, ACR in accordance with ASTM B42, ASTM B43, ASTM B68/B68M, ASTM B88, ASTM B251 and ASTM B280. Fittings shall be wrought copper or brass, solder type in accordance with ASME B16.18 or ASME B16.22. Changes in direction shall be made with appropriate tool bends. Brass compression-type fittings shall be used at final connection to devices; other joints shall be brazed using a BCuP-5 brazing alloy with solidus above 1,100°F (593°C) and liquids below 1,500°F (816°C). Brazing flux shall be used on copper-to-brass joints only.

    Exception: Nonmetallic tubing used within control panels and at the final connection to devices provided that all of the following conditions are met:

    1. Tubing shall comply with the requirements of Chapter 6 of the California Mechanical Code .
    2. Tubing and connected devices shall be completely enclosed within a galvanized or paint-grade steel enclosure having a minimum thickness of 0.0296 inch (0.7534 mm) (No. 22 gage). Entry to the enclosure shall be by copper tubing with a protective grommet of neoprene or Teflon or by suitable brass compression to male barbed adapter.
    3. Tubing shall be identified by appropriately documented coding.
    4. Tubing shall be neatly tied and supported within the enclosure. Tubing bridging cabinets and doors or moveable devices shall be of sufficient length to avoid tension and excessive stress. Tubing shall be protected against abrasion. Tubing connected to devices on doors shall be fastened along hinges.

    [F] 909.13.2 Isolation from other functions. Control tubing serving other than smoke control functions shall be isolated by automatic isolation valves or shall be an independent system.

    [F] 909.13.3 Testing. Control air tubing shall be tested at three times the operating pressure for not less than 30 minutes without any noticeable loss in gauge pressure prior to final connection to devices.

    [F] 909.14 Marking and identification. The detection and control systems shall be clearly marked at all junctions, accesses and terminations.

    [F] 909.15 Control diagrams. Identical control diagrams showing all devices in the system and identifying their location and function shall be maintained current and kept on file with the fire code official, the fire department and in the fire command center in a format and manner approved by the fire code official.

  • CPC § 29.3 Medium relevance — show source text

    Exceptions:

    (1) Water heaters installed in individual dwelling units.

    (2) Individual gas water heaters with input capacity not greater than 100 000 Btu/h (29.3 kW). [ASHRAE 90.1:7.5.3] L 503.4.4 Heat Recovery for Service Water Heating. Condenser heat recovery systems shall be installed for heating or preheating of service hot water provided all of the following are true:

    (1) The facility operates 24 hours a day.

    (2) The total installed heat rejection capacity of the water-cooled systems exceeds 6 000 000 Btu/h (1758 kW) of heat rejection.

    (3) The design service water-heating load exceeds 1 000 000 Btu/h (293 kW). [ASHRAE 90.1:6.5.6.2.1]

    512 2025 CALIFORNIA PLUMBING CODE

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

    APPENDIX L

    L 503.4.5 Capacity. The required heat recovery system shall have the capacity to provide the smaller of:

    (1) Sixty percent of the peak heat-rejection load at design conditions or

    (2) Preheat of the peak service hot-water draw to 85°F (29°C).

    Exceptions:

    (1) Facilities that employ condenser heat recovery for space heating with a heat recovery design exceeding 30 percent of the peak water-cooled condenser load at design conditions.

    (2) Facilities that provide 60 percent of their service water heating from onsite renewable energy or siterecovered energy or from other sources. [ASHRAE 90.1:6.5.6.2.2] L 503.5 Submittals. The Authority Having Jurisdiction shall require submittal of compliance documentation and supplemental information in accordance with Section 104.3.1 of this code.

    L 504.0 Solar Water Heating Systems.

    L 504.1 General. The erection, installation, alteration, addition to, use or maintenance of solar water heating systems shall be in accordance with this section and the Uniform Solar Energy and Hydronics Code.

    L 504.2 Annual Inspection and Maintenance. Solar energy systems that utilize a heat transfer fluid shall annually be inspected unless inspections are required on a more frequent basis by the solar energy system manufacturer.

    L 505.0 Hard Water.

    L 505.1 Softening and Treatment. Where water has a hardness equal to or exceeding 10 gr/gal (171 mg/L) measured as total calcium carbonate equivalents, the water supply line to water heating equipment and the circuit of boilers shall be softened or treated to prevent accumulation of limescale and consequent reduction in energy efficiency.

    L 506.0 Drain Water Heat Exchangers. L 506.1 General. Drain water heat exchangers shall comply with IAPMO PS 92. The heat exchanger shall be accessible.

  • CPC § 7.47 Medium relevance — show source text

    15|7.47|7.72|8.10|8.37|8.58| |45|75|30|7.05|7.35|7.58|7.93|8.18|8.36| |44|75|31|6.95|7.23|7.45|7.77|8.00|8.16| |43|75|32|6.85|7.13|7.33|7.63|7.83|7.98| |42|75|33|6.75|7.03|7.22|7.49|7.68|7.82| |41|75|34|6.65|6.93|7.12|7.37|7.55|7.67| |46|80|34|6.65|6.93|7.12|7.37|7.55|7.67| |40|75|35|6.55|6.83|7.01|7.26|7.42|7.54| |45|80|35|6.55|6.83|7.01|7.26|7.42|7.54| |44|80|36|6.44|6.73|6.92|7.15|7.30|7.41| |43|80|37|6.32|6.63|6.82|7.05|7.19|7.30| |42|80|38|6.20|6.53|6.72|6.95|7.09|7.19| |41|80|39|6.06|6.42|6.62|6.85|6.99|7.08| |46|85|39|6.06|6.42|6.62|6.85|6.99|7.08| |40|80|40|5.91|6.30|6.52|6.76|6.89|6.98| |45|85|40|5.91|6.30|6.52|6.76|6.89|6.98| |44|85|41|5.75|6.17|6.403|6.66|6.79|6.89| |43|85|42|5.57|6.03|6.28|6.55|6.70|6.79| |42|85|43|5.37|5.88|6.16|6.44|6.59|6.69| |41|85|44|5.15|5.71|6.01|6.33|6.49|6.59| |40|85|45|4.91|5.53|5.86|6.20|6.37|6.48| |Condenser DT2|Condenser DT2|Condenser DT2|14.04|11.23|9.36|7.02|5.62|4.68| |1. LIFT = Entering Condenser Water Temperature (°F) – Leaving Chilled Water Temperature (°F)
    2.

Frequently asked questions

Do all new potable piping systems require disinfection?

Generally yes when required by the Authority Having Jurisdiction; when no local method is prescribed follow the Code’s options in § 609.10 (50 ppm/24 hr or 200 ppm/3 hr, flushing, bacteriological repeat if needed).

How close must the low‑pressure cutoff be to the pump inlet?

The low‑pressure cutoff switch must be installed not more than 5 feet (1524 mm) from the pump inlet and set for not less than 10 psi (69 kPa). § 609.9.

Are potable water pumps required to be NSF certified?

Yes—pumps intended to supply drinking water must comply with NSF/ANSI/CAN 61 as required in § 609.8.2.

What insulation thickness is required for a 1‑inch hot water pipe?

For a pipe up to 2 inches diameter, the insulation wall thickness must be not less than the diameter of the pipe (so 1 in pipe requires ≥1 in insulation) under § 609.12.2.

Where can I find the full test requirements in § 609.4?

The available preview shows the § 609.4 heading but does not include its full text in the retrieved snippets — consult the full CPC text or the Authority Having Jurisdiction for the complete § 609.4 testing rules.

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