CPC · California Plumbing Code
What maintenance, inspection frequency and O&M documentation is required?
If you own an alternate water source or nonpotable rainwater system in California, you are responsible for keeping it inspected and maintained at the minimum frequencies in the Plumbing Code tables (filters every 3 months, gutters/roof surfaces every 6 months, pumps/valves/tanks and cross‑connection tests annually, etc.), providing an O&M manual with diagrams/instructions, and retaining records (and water‑quality tests where required) for inspection by the Authority Having Jurisdiction.
Last reviewed: July 6, 2026
What the code requires — 2–4 sentences
In plain English: the property owner must ensure required maintenance and inspections for alternate water sources (including nonpotable rainwater catchment systems) are performed at the minimum frequencies listed in the code tables and any more-frequent manufacturer or Authority Having Jurisdiction (AHJ) requirements. The controlling rules are § 1501.5 (alternate water sources), § 1601.5 (nonpotable rainwater), § 1601.6 (operation and maintenance manual), and the specific frequencies in Table 1601.5 (and Table 1501.5 for alternate water sources) — see the code text for each § and table.
The single most important rule: the property owner is responsible for required maintenance and inspection, and must follow the minimum frequencies in the code tables (unless the manufacturer or the Authority Having Jurisdiction requires more frequent actions).
Requirements in detail
Who is responsible
- Property owner — required to perform or ensure required maintenance and inspections unless the AHJ assigns responsibility otherwise (§ 1601.5.1, § 1501.5.1).
Operation & maintenance documentation (O&M manual)
- An Operation and Maintenance manual (O&M manual) must be supplied to the building owner by the system designer or installer for systems requiring a permit. The manual must include: system diagrams, operating/maintenance instructions, instructions to maintain required water quality, procedures to deactivate the system for maintenance, applicable testing/inspection/maintenance frequencies (per the applicable table), and contact information for manufacturer/installer. This is required by § 1601.6 (rainwater) and § 1501.6 (alternate water sources).
Recordkeeping / maintenance log
- Maintain a maintenance log or records of testing, inspection and maintenance (Appendix K explicitly requires a log and retention of water quality test records for not less than 2 years for potable rainwater systems; alternate/nonpotable system sections require records per AHJ). Retain results and make available for inspection by the AHJ.
Minimum inspection & maintenance frequencies (decision table)
The code provides minimum frequencies in the chapter tables. Use the table below when deciding schedule and documenting in the O&M manual.
| Action / component | Minimum frequency (code) | Code reference |
|---|---|---|
| Inspect and clean filters and screens; replace as needed | Every 3 months (or per manufacturer/AHJ) | Table 1601.5 — Table 1601.5; see § 1601.5 |
| Inspect/verify disinfection, filters, water‑quality treatment devices are operational | Per manufacturer’s instructions and the AHJ | Table 1601.5; § 1601.5 |
| Inspect and clear debris from gutters, downspouts, roof washers | Every 6 months | Table 1601.5 — Table 1601.5 |
| Inspect and clear debris from roof or aboveground collection surfaces | Every 6 months | Table 1601.5 — Table 1601.5 |
| Remove overhanging tree branches / vegetation | As needed | Table 1601.5 — Table 1601.5 |
| Inspect pumps, valves, pressure tanks, storage tanks, locking devices, caution labels/marking | After initial installation and every 12 months thereafter (or per manufacturer/AHJ) | Table 1601.5 — Table 1601.5; also recommended in Table 1501.5 |
| Cross‑connection inspection & test* | After initial installation and every 12 months thereafter (performed in presence of AHJ per chapter) | Table 1601.5; cross‑connection test requirements referenced in chapter (see § 1601.5 and related cross‑connection sections) |
| Water quality testing (where required by § 1603.4) | Every 12 months; and after renovation/repair (or per AHJ/manufacturer) | Table 1601.5 — Table 1601.5; see § 1603.4 for minimum water quality triggers |
*The code notes that the cross‑connection test must be performed in the presence of the Authority Having Jurisdiction unless the AHJ permits an alternate arrangement.
Manufacturer & AHJ precedence
- Where the manufacturer or the AHJ specifies more frequent testing, inspection or maintenance, those requirements control (the code tables are minimums). See the repeated instruction that items be inspected “in accordance with manufacturer’s instructions and the Authority Having Jurisdiction.” § 1501.5, Table 1601.5.
Exceptions & special cases
- AHJ may require alternate frequencies or additional tests; the tables are minimums. (Tables state “in accordance with manufacturer’s instructions and the Authority Having Jurisdiction.”)
- Some small irrigation-only potable/nonpotable systems may be exempt from treatment (see exceptions in the rainwater and alternate water sections — e.g., treatment not required for certain small aboveground irrigation systems or specified irrigation methods). See § 1601.7 and the exceptions referenced in Chapter 15/1501.*
- Cross‑connection testing: the code requires it in the AHJ’s presence (unless AHJ allows otherwise) — plan and coordinate with AHJ before scheduling cross‑connection tests.
Common mistakes
- Failing to supply an O&M manual at permit completion (required by § 1601.6 and § 1501.6). Many installers omit diagrams, frequencies, or contact details — include all mandatory items.
- Treating the tables as recommendations only — they are minimum legally required frequencies unless the AHJ or manufacturer specifies otherwise (tables are normative for minimums). See Table 1601.5 and Table 1501.5.
- Not keeping records or failing to produce them on inspection — Appendix K requires retention of water quality test records for not less than 2 years for potable rainwater; other sections require records available to AHJ. Keep the maintenance log accessible.
- Forgetting the AHJ’s role: AHJ must be present for specific tests (cross‑connection), and may mandate different test schedules — coordinate in advance.
Worked example — small commercial landscape irrigation system
Scenario: A building owner installs a nonpotable rainwater catchment system that feeds landscape irrigation. System components: roof collectors, gutters, coarse filter + cartridge filter, 1 pump, 1 storage tank (1,200 gallons), and dedicated nonpotable piping to irrigation outlets. The system required a permit.
Required actions (apply the code minimums):
- Provide an O&M manual at turnover that includes diagrams, instructions, water‑quality maintenance instructions, shutdown procedures, testing/inspection frequencies, and manufacturer contacts — per § 1601.6 and § 1501.6.
- Filters/screens — schedule cleaning every 3 months (Table 1601.5). Document each cleaning in the maintenance log.
- Gutters, downspouts, roof washers — inspect and clear every 6 months. Log the inspections and any debris removal.
- Pump, valves, pressure tank, storage tank, labels — inspect after initial installation and then annually (every 12 months). Include verification of operation in the log.
- Cross‑connection test — perform after initial installation and every 12 months thereafter, in coordination with AHJ (AHJ presence required or as allowed by AHJ). Record date, tester, results, and corrective actions.
- Water quality testing — if the intended use or § 1603.4 requires testing, do water‑quality tests every 12 months and after any system renovation/repair; retain records in the log.
Cost‑control note: If a manufacturer specifies more frequent cartridge changes or testing, follow that schedule even if heavier than the table — it also protects warranties and system performance.
Related provisions
- § 1501.5 — Maintenance and inspection for alternate water sources (includes Table 1501.5 recommended frequencies).
- § 1501.6 — Operation and maintenance manual requirements for alternate water sources.
- Table 1501.5 — Recommended minimum testing/inspection/maintenance frequency for alternate water sources.
- § 1601.5 — Maintenance and inspection for nonpotable rainwater catchment systems and responsibility language.
- Table 1601.5 — Minimum alternate water source testing, inspection, and maintenance frequency for rainwater catchment systems.
- § 1601.6 — Operation and maintenance manual content required for rainwater catchment systems.
- § 1603.4 — Minimum water quality requirements (when water testing is triggered).
- Appendix K (K 101.5.2 & K 101.6) — Potable rainwater potable catchment maintenance log and O&M manual specifics (retention of water quality test records ≥ 2 years).
Code references
Grounded in the retrieved California Plumbing Code — click a citation to read the verbatim passage:
CPC § 101.3.2 High relevance — show source text
** No permit for a rainwater catchment system requiring a permit shall be issued until complete plumbing plans, with data satisfactory to the Authority Having Jurisdiction, have been submitted and approved. No changes or connections shall be made to either the rainfall catchment or the potable water system within a site containing a rainwater catchment water system without approval by the Authority Having Jurisdiction. K 101.3.2 System Changes. No changes or connections shall be made to either the rainwater catchment system or the potable water system within a site containing a rainwater catchment system requiring a permit without approval by the Authority Having Jurisdiction. K 101.4 Product and Material Approval. System components shall be properly identified as to the manufacturer. K 101.4.1 Plumbing Materials and Systems. Pipe, pipe fittings, traps, fixtures, material, and devices used in a potable rainwater system shall be listed or labeled (thirdparty certified) by a listing agency (accredited conformity assessment body) and shall be in accordance with approved applicable recognized standards referenced within this code, and shall be free from defects. Unless otherwise provided for in this appendix, materials, fixtures, or devices used or entering into the construction of plumbing systems, or parts thereof shall be submitted to the Authority Having Jurisdiction for approval.
K 101.5 Maintenance and Inspection. Potable rainwater catchment systems and components shall be inspected and maintained in accordance with Section K 101.5.1 through Section K 101.5.3.
K 101.5.1 Frequency. Potable rainwater catchment systems and components shall be inspected and maintained in accordance with Table K 101.5.1 unless more
frequent inspection and maintenance are required by the manufacturer.
K 101.5.2 Maintenance Log. A maintenance log for potable rainwater catchment systems shall be maintained by the property owner and be available for inspection. The property owner or designated appointee shall ensure that a record of testing, inspection, and maintenance in accordance with Table K 101.5.1 is maintained in the log. The log will indicate the frequency of inspection, and maintenance of each system. A record of the required water quality tests shall be retained for not less than 2 years.
K 101.5.3 Maintenance Responsibility. The required maintenance and inspection of potable rainwater catchment systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.
K 101.6 Operation and Maintenance Manual. An operation and maintenance manual for potable rainwater catchment systems shall be supplied to the building owner by the system designer. The operating and maintenance manual shall include the following:
(1) Detailed diagram of the entire system and the location of system components.
(2) Instructions for operating and maintaining the system.
(3) Details on maintaining the required water quality as determined by the Authority Having Jurisdiction.
(4) Details on deactivating the system for maintenance, repair, or other purposes.
(5) Applicable testing, inspection, and maintenance frequencies in accordance with Table K 101.5.1.
(6) A method of contacting the manufacturer(s).
CPC § 101.13.4 High relevance — show source text
APPENDIX S
equipment of the stormwater treatment system is in accordance with the approved plans and specifications. The performance test report shall include the equipment tested, the testing methods utilized, and proof of proper calibration of the equipment. S 101.13.4 Commissioning Report. The commissioning report shall be submitted to the Authority Having Jurisdiction.
S 101.14 Operation and Maintenance Manual. An operation and maintenance manual shall be provided in accordance with Section 1501.6 and shall also include the following:
(1) Instructions on operating and maintaining the system, including treatment process operations, instrumentation and alarms, and chemicals storage and handling.
(2) Site equipment inventory and maintenance notes.
(3) Equipment/system warranty documentation and information.
(4) As-built design drawings.
(5) Details on training requirements and qualifications of personnel responsible for operating the system.
(6) Maintenance schedule. S 101.15 Inspection. Field inspections shall take place during and after construction while the contractor is on-site to verify that the stormwater treatment system components have been properly supplied and installed according to the plans and specifications used for installation. Record drawings shall be maintained with changes to the approved plans by the contractor and available for periodic inspection as needed.
S 102.0 Definitions.
S 102.1 General. For the purpose of this appendix, the following definitions shall apply: Challenge Test. The evaluation of a unit treatment process for pathogen log 10 reduction performance using selected surrogate or indigenous constituents. This includes a detailed technology evaluation study conducted to challenge the treatment technology over a wide range of operational conditions. Commissioning. The activities associated with bringing a new process into normal working condition. Field Verification. Performance confirmation study conducted using challenge testing, including surrogate microorganisms and/or other non-biological surrogates, usually during startup and commissioning. Log 10 Reduction. The removal of a pathogen or surrogate in a unit process expressed in log 10 units of the effluent concentration over the influent concentration (e.g., a 1-log reduction equates to 90% removal, 2-log reduction to 99% removal, 3-log reduction to 99.9% removal, and so on). Log 10 Reduction Target (LRT). The log 10 reduction target for the specified pathogen group (e.g., viruses, bacteria, or protozoa) to achieve the identified level of risk to individuals (e.g., 10 [-4] infection per year). Stormwater. Natural precipitation that has contacted a surface at grade, below grade, or above ground parking surfaces.
Surrogate. A biological, chemical, or physical parameter used to verify pathogen reductions performances. Validation Report. Report documenting the results of a challenge test conducted during field verification.
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CPC § 101.5.1 High relevance — show source text
K 101.5.1 Frequency. Potable rainwater catchment systems and components shall be inspected and maintained in accordance with Table K 101.5.1 unless more
frequent inspection and maintenance are required by the manufacturer.
K 101.5.2 Maintenance Log. A maintenance log for potable rainwater catchment systems shall be maintained by the property owner and be available for inspection. The property owner or designated appointee shall ensure that a record of testing, inspection, and maintenance in accordance with Table K 101.5.1 is maintained in the log. The log will indicate the frequency of inspection, and maintenance of each system. A record of the required water quality tests shall be retained for not less than 2 years.
K 101.5.3 Maintenance Responsibility. The required maintenance and inspection of potable rainwater catchment systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.
K 101.6 Operation and Maintenance Manual. An operation and maintenance manual for potable rainwater catchment systems shall be supplied to the building owner by the system designer. The operating and maintenance manual shall include the following:
(1) Detailed diagram of the entire system and the location of system components.
(2) Instructions for operating and maintaining the system.
(3) Details on maintaining the required water quality as determined by the Authority Having Jurisdiction.
(4) Details on deactivating the system for maintenance, repair, or other purposes.
(5) Applicable testing, inspection, and maintenance frequencies in accordance with Table K 101.5.1.
(6) A method of contacting the manufacturer(s).
K 101.7 Minimum Water Quality Requirements. The minimum water quality for potable rainwater catchment systems shall comply with the applicable water quality requirements as determined by the Authority Having Jurisdiction. In the absence of water quality requirements, the guidelines EPA/600/R12/618 contains recommended water reuse guidelines to assist regulatory agencies develop, revise, or expand alternate water source water quality standards.
K 101.8 Material Compatibility. In addition to the requirements of this appendix, potable rainwater catchment systems shall be constructed of materials that are compatible with the type of pipe and fitting materials and water conditions in the system.
K 101.9 System Controls. Controls for pumps, valves, and other devices that contain mercury that come in contact with the water supply shall not be permitted.
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APPENDIX K
TABLE K 101.5.1 MINIMUM POTABLE RAINWATER CATCHMENT SYSTEM TESTING, INSPECTION, AND MAINTENANCE FREQUENCY
DESCRIPTION MINIMUM FREQUENCY Inspect and clean filters and screens, and replace (where necessary). Every 3 months Inspect and verify that disinfection, filters and water quality treatment devices and
systems are operational. Perform water quality tests in accordance with the Author-
ity Having Jurisdiction.In accordance with the manufacturer’s instructions,
and the Authority Having Jurisdiction.Perform applicable water quality tests to verify compliance with Section K 104.3. Every 3 months Perform a water quality test for E. Coli, Total Coliform, and Heterotrophic bacte-
ria.CPC § 8-19 High relevance — show source text
Project change orders and information d. Current requirements i. Building operating schedules
2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-19
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
ii. Space temperature, humidity and pressure, CO 2 setpoints
iii. Summer and winter setback schedules
iv. Chilled and hot water temperatures v. As-built control setpoints and parameters
- Site contact information
a. Owner information
b. Emergency contacts c. Design team: architect, mechanical engineer, electrical engineer, etc.
d. Prime contractor contact information
e. Subcontractor information
f. Equipment supplier contact information 3. Basic operation and maintenance, including general site operating procedures, basic trouble shooting, recommended maintenance requirements site events log
a. Basic operation i. Written narratives of basic equipment operation ii. Interfaces, interlocks and interaction with other equipment and systems iii. Initial maintenance provided by contactor b. General site operating procedures i. Instructions for changes in major system operating schedules ii. Instructions for changes in major system holiday and weekend schedules c. Basic troubleshooting i. Cite any recommended troubleshooting procedures specific to the major systems and equipment installed in the building. ii. Manual operation procedures iii. Standby/backup operation procedures iv. Bypass operation procedures v. Major system power fail resets and restarts vi. Trend log listing d. Recommended maintenance events log e. Operation & Maintenance manuals - location or delivery information
- Major systems a. Renewable energy systems i. Photovoltaic panels and inverters ii. Wind-powered electrical generators and inverters b. Landscape irrigation systems i. Water distribution diagrams ii. Control system
c. Water reuse systems i. Reclaimed water system for indoor use ii. Reclaimed water for irrigation use 5. Site equipment inventory and maintenance notes
a. Spare parts inventory b. Frequently required parts and supplies c. Special equipment required to operate or maintain systems d. Special tools required to operate or maintain systems 6. A copy of all special inspection verifications required by the enforcing agency of this code
- Other resources and documentation
6.1.3 Enforcement:
At their discretion, the inspector confirms demonstrated compliance during on-site enforcement by: a. Receipt of a copy of the Systems Manual, or b. Receipt of a form signed by the owner or owner’s representative attesting that the systems manual has been completed.
8-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
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COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
Reference: 6.2 Documentation and training
CALGreen Section 5.410.2.5, Documentation and training.
Section 5.410.2.5.2, Systems operations training.
6.2.1 Intent:
The systems operation training verifies that a training program is developed to provide training to the appropriate maintenance staff for each equipment type and/or system and that this training program is documented in the commissioning report. The systems operations training program is specified in the project specifications for the major systems listed. The systems manual, Operation and Maintenance (O&M) documentation and record drawings are prepared and available to the maintenance staff prior to implementation of any training or the development of a written training program. The training program is to be administered when the appropriate maintenance staff is made available to receive training.
CPC § 6.1.3 High relevance — show source text
c. Water reuse systems i. Reclaimed water system for indoor use ii. Reclaimed water for irrigation use 5. Site equipment inventory and maintenance notes
a. Spare parts inventory b. Frequently required parts and supplies c. Special equipment required to operate or maintain systems d. Special tools required to operate or maintain systems 6. A copy of all special inspection verifications required by the enforcing agency of this code
- Other resources and documentation
6.1.3 Enforcement:
At their discretion, the inspector confirms demonstrated compliance during on-site enforcement by: a. Receipt of a copy of the Systems Manual, or b. Receipt of a form signed by the owner or owner’s representative attesting that the systems manual has been completed.
8-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
Reference: 6.2 Documentation and training
CALGreen Section 5.410.2.5, Documentation and training.
Section 5.410.2.5.2, Systems operations training.
6.2.1 Intent:
The systems operation training verifies that a training program is developed to provide training to the appropriate maintenance staff for each equipment type and/or system and that this training program is documented in the commissioning report. The systems operations training program is specified in the project specifications for the major systems listed. The systems manual, Operation and Maintenance (O&M) documentation and record drawings are prepared and available to the maintenance staff prior to implementation of any training or the development of a written training program. The training program is to be administered when the appropriate maintenance staff is made available to receive training.
6.2.2 Compliance Method:
The written training program includes: (a) learning goals and objectives for each session, (b) training agenda, topics and length of instruction for each session, (c) instructor information and qualifications, (d) location of training sessions (on-site, off-site, manufacturer’s or vendor’s facility), (e) attendance forms, (f) training materials and (g) description on how the training will be archived for future use.
- Systems/equipment overview a. Review OPR and BOD related to the major systems and equipment b. Describe system type and configuration c. Explain operation of all major systems and equipment and how it interfaces with other systems and equipment d. Describe operation of critical devices, controls and accessories e. Review location of the major systems and equipment f. Describe operation of control system for each system, location of critical control elements and procedures to properly operate control system g. Review recommendations for implementation to reduce energy and water use
- Review and demonstration of servicing/preventive maintenance a. Explain location or delivery contact of the Operation & Maintenance manuals b. Review of all manufacturer’s recommended maintenance activities to maintain warranty c. Review and demonstrate frequent maintenance activities and suggested schedule d. Review and demonstrate typical servicing procedures and techniques (electrical current, pressure and flow readings, etc.; calibration procedures, point trending, power fail restart procedures, etc.) e. Locate, observe and identify major equipment, systems, accessories and controls f. Review emergency shut-offs and procedures
- Review the information in the systems manual a. Describe use of systems manual b. Review elements of systems manual c. Explain how to update and add revisions to systems manual
CPC § 1504.2 High relevance — show source text
fields and mulch basins . . . . . . . . . . . . . . . . . .1504.2
Drainage or sewer connections . . . . . . . . .304.1, 713.0
Filters . . . . . . . . . . . . . . . . . . . . . . . .1506.10.5, 1603.18
Flushing devices . . . . . . . . . . . . . . . . . . . . . . . . . .413.1 Fuel gas pipe size . . . . . . . . . . . . . . . . . . . . . . . .1215.0 Fuel gas supply . . . . . . . . . . . . . . . . . . . . . . . . . .1214.0 Gravity drainage . . . . . . . . . . . . . . . . . . . . . . . . . .709.0
Hot and cold water . . . . . . . . . . . . . . . . . . . . . . .601.2.1
Inspections . . . . . . . . . . . . . . . . . . . . .1406.0, 1502.3.4,
1605.3.4
Low-pressure cutoff . . . . . . . . . . . . . . . . . . . . . . . .609.9 Medical gas and medical vacuum pipe size . . . . . . . . . . . . . . . .1323.1
Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104.0
Plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103.3
Plumbing fixtures . . . . . . . . . . . . . . .422.0, Table 422.1
Tests . . . . . . . . . . . . . . . . .1502.2 – 1502.3.4, 1504.10,
1505.6, 1506.6, 1602.5
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .901.2
RESPONSIBLE FOR TESTING . . . . . . . . . . . . . . . .105.2.5
RESTAURANT, GREASE INTERCEPTORS . . . . . . .1014.1
RETESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3.2
RISERS
Fuel gas . . . . . . . . . . . . . . .1208.5.6, 1210.1.7, 1210.4.4,
E 403.6, E 404.3
Medical gas and
medical vacuum . . . . . . . . . . . . . . .1323.3, 1323.13.3
Sewer . . . . . . . . . . . . . . . . . . . . . . . .E 504.6, E 504.6.2
CPC § 1505.14 High relevance — show source text
1505.14 Inspection and Testing . . . . . . . . .320
1505.15 Minimum Water Quality Requirements for Reclaimed (Recycled) Water . . . . . . . . . . . . .322
1505.16 Maintenance and Inspection . . . .322
Table 1505.16 Minimum Reclaimed (Recycled) Water Source Testing, Inspection, and Maintenance Frequency . . . . . . .322
1506.0 On-Site Treated Nonpotable Gray Water Systems . . . . . . . . . .322
1506.1 General . . . . . . . . . . . . . . . . . . . . .322
1506.2 Plumbing Plan Submission . . . . . .322
1506.3 System Changes . . . . . . . . . . . . .322
1506.4 Connections to Potable or Recycled Water Supply Systems . . . . . . . . . . . . . . . . . . . .322
1506.5 Water Pressure . . . . . . . . . . . . . . .322
1506.6 Initial Cross-Connection Test . . . .323
1506.7 On-Site Treated Nonpotable Gray Water System Materials . . .323
1506.8 On-Site Treated Nonpotable Gray Water Devices and Systems . . . . . . . . . . . . . . . . . . . .323
1506.9 On-Site Treated Nonpotable Gray Water System Color and Marking Information . . . . . . . . . . .323
1506.10 Design and Installation . . . . . . . . .323
1506.11 Valves . . . . . . . . . . . . . . . . . . . . . .323
1506.12 Signs . . . . . . . . . . . . . . . . . . . . . . .323
1506.13 Inspection and Testing . . . . . . . . .323
CHAPTER 16 NONPOTABLE RAINWATER
CATCHMENT SYSTEMS . . . . . . .325
1601.0 General . . . . . . . . . . . . . . . . . . . . .327
1601.1 Applicability . . . . . . . . . . . . . . . . . .327
1601.2 System Design . . . . . . . . . . . . . . .327
1601.3 Permit . . . . . . . . . . . . . . . . . . . . . .327
1601.4 Component Identification . . . . . . .327
1601.5 Maintenance and Inspection . . . .327
Table 1601.5 Minimum Alternate Water Source Testing, Inspection, and Maintenance Frequency . . . .327
1601.6 Operation and Maintenance Manual . . . . . . . . . . . . . . . . . . . . .328
1601.7 Minimum Water Quality Requirements . . . . . . . . . . . . . . . .328
1601.8 Material Compatibility . . . . . . . . . .328
1601.9 System Controls . . . . . . . . . . . . . .328
1601.10 Separation Requirements . . . . . . .328
CPC § 101.13 High relevance — show source text
The test shall be ruled successful by the Authority Having Jurisdiction before final approval is granted. S 101.13 Commissioning. Onsite stormwater treatment systems shall be commissioned in accordance with the requirements of Section S 101.13.1 through Section S 101.13.4.
S 101.13.1 Commissioning Requirements. Commissioning for stormwater treatment systems shall be included in the design and construction processes of the project. Commissioning shall be performed by a person who demonstrates competency in commissioning stormwater treatment systems as required by the Authority Having Jurisdiction. S 101.13.2 Commissioning Plan. The construction documents shall include the commissioning plan for the stormwater treatment system. The commissioning plan shall be approved by the Authority Having Jurisdiction prior to commissioning the stormwater treatment system. The commissioning plan shall include the following:
(1) General project information.
(2) Equipment to be tested, including the test methodology.
(3) Processes to be tested.
(4) Criteria or process for testing.
(5) Criteria or process for acceptance.
(6) Commissioning team contact information.
(7) Commissioning process activities, schedules, and responsibilities.
(8) Plans for the completion of functional performance testing, post construction documentation and training, and the commissioning report. S 101.13.3 Performance Testing. Performance tests shall verify that the installation and operation of the
TABLE S 101.11(2)
MONITORING PARAMETERS
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APPENDIX S
equipment of the stormwater treatment system is in accordance with the approved plans and specifications. The performance test report shall include the equipment tested, the testing methods utilized, and proof of proper calibration of the equipment. S 101.13.4 Commissioning Report. The commissioning report shall be submitted to the Authority Having Jurisdiction.
S 101.14 Operation and Maintenance Manual. An operation and maintenance manual shall be provided in accordance with Section 1501.6 and shall also include the following:
(1) Instructions on operating and maintaining the system, including treatment process operations, instrumentation and alarms, and chemicals storage and handling.
(2) Site equipment inventory and maintenance notes.
(3) Equipment/system warranty documentation and information.
(4) As-built design drawings.
(5) Details on training requirements and qualifications of personnel responsible for operating the system.
(6) Maintenance schedule. S 101.15 Inspection. Field inspections shall take place during and after construction while the contractor is on-site to verify that the stormwater treatment system components have been properly supplied and installed according to the plans and specifications used for installation. Record drawings shall be maintained with changes to the approved plans by the contractor and available for periodic inspection as needed.
S 102.0 Definitions.
S 102.1 General. For the purpose of this appendix, the following definitions shall apply: Challenge Test. The evaluation of a unit treatment process for pathogen log 10 reduction performance using selected surrogate or indigenous constituents. This includes a detailed technology evaluation study conducted to challenge the treatment technology over a wide range of operational conditions. Commissioning. The activities associated with bringing a new process into normal working condition. **Field Verification.
CPC § 301.5 Medium relevance — show source text
** A domestic water supply connection to a non-sewered sanitation system shall be protected in accordance with this code.
O 301.5 Effluent Storage. Any container or vessel for the storage of effluent discharged from a non-sewered sanitation system and not integral to such system shall be installed in accordance with the plumbing code. O 301.6 Systems Employing Combustion. A non-sewered sanitation system employing combustion shall comply with the mechanical code.
O 301.7 Connection to Plumbing System Not Required. Unless the Authority Having Jurisdiction determines otherwise, a non-sewered sanitation system is not required to be connected to the drainage system of the building or premises.
O 401.0 Manual Required. O 401.1 Operation and Maintenance Manual. Nonsewered sanitation systems shall have an operation and maintenance manual provided by the manufacturer.
O 501.0 System Output. O 501.1 General. The use or disposal of all substances exiting the non-sewered sanitation system shall be determined by the Authority Having Jurisdiction.
2025 CALIFORNIA PLUMBING CODE 533
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
534 2025 CALIFORNIA PLUMBING CODE
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE
APPENDIX P - PROFESSIONAL QUALIFICATIONS
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
Adopting Agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGSFM 1 2 1-AC AC ** SS** SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6 Adopt Entire Chapter Adopt Entire Chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowChapter/Section 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 535
CPC § 2205.1 Medium relevance — show source text
Cold-Formed Steel 2204
Cold-formed Stainless Steel 2205.1 Cutting and notching 2206.3 Light-frame construction 2206 Special inspection 1705.12.2, 1705.13.3, 1705.2.3, 1705.2.7 Combustible Dusts 307.4, 414.5.1, 426.1 Combustible Liquids 307.1, 307.4, 307.5, 414.2.5, 414.5.3, 415.9.2, 415.10.1, 418.6
Combustible Material
Concealed spaces 413.2, 718.5 Exterior side of exterior wall 1405 High-pile stock or rack storage 413.1, 910.2.2 Type I and Type II 603, 805 Combustible Projections 705.2, 705.2.3.1 Combustible Storage 413, 910.2.2 Common Path of Egress Travel 1006.2.1 Compartmentation Ambulatory care facilities 422.2, 422.3 Group I-2 407.5, 407.6 Group I-3 408.6 Laboratory suites 428.3 Underground buildings 405.4, 405.5.2 Compressed Gas 307.2, 415.11.8 Concealed Spaces 413.2, 718 Concrete Chapters 19 and 19A Anchorage 1901.3 Calculated fire resistance 722.2
Cellular 721.2
Construction documents 1603.1,
1901.5 Durability 1904 Footings 1809, 1906 Foundation walls 1807.1.5, 1808.8 Materials 1705.3.2, 1901, 1903 Plain, structural 1906 Reinforced gypsum concrete 2514 Rodentproofing Appendix F Roof tile 1504.3, 1507.3, 1513 Shotcrete 1908 Slabs-on-ground 1907 Special inspections 1705.3, Table 1705.3 Specifications 1903 Strength testing 1705.3.2 Structural concrete with GFRP
reinforcement 1901.2.1 Wood support 2304.13 Concrete Masonry Calculated fire resistance 722.3
Construction 2104
Design 2101.2, 2108, 2109 Materials 2103.1 Surface bonding 2103.2.2, 2109.2 Wood support 2304.13 Concrete Roof Tile 1504.3, 1507.3, 1513 Wind Resistance 1504.3, 1609.6.3.1 Condominium (see Apartment Houses) Conduit, Penetration Protection 713.3,
1023.5 Conflicts in Code 102, 104.2.4.1 Congregate Living Facilities 310.2, 310.3, 310.4
Construction (See Safeguards During Construction) Construction Documents 107, 1603 Alarms and detection 907.1.1
Balconies 107.2.5
CPC § 4.00 Medium relevance — show source text
10
wood screw|1|24|4.00|0.90|DR|DR|2.85|DR|DR|DR| |Minimum 1x
Wood Furringd|Minimum 2x
Wood Stud|1/4" lag screw|11/2|12|4.00|2.65|1.50|0.90|4.00|1.65|0.80|DR| |Minimum 1x
Wood Furringd|Minimum 2x
Wood Stud|1/4" lag screw|11/2|16|4.00|1.95|0.95|0.50|4.00|1.10|DR|DR| |Minimum 1x
Wood Furringd|Minimum 2x
Wood Stud|1/4" lag screw|11/2|24|4.00|1.10|DR|DR|3.25|0.50|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 framing and furring shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS.
b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths.
c. The thickness of wood structural panels complying with the specific gravity requirements of Note a shall be permitted to be included in satisfying the minimum required
penetration into framing.
d. Where the required cladding fastener penetration into wood material exceeds3/4 inch and is not more than 11/2 inches, a minimum 2-inch nominal wood furring or an
approved design shall be used.
e. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.
f. Furring shall be spaced not greater than 24 inches on center in a vertical or horizontal orientation. In a vertical orientation, furring shall be located over wall studs and attached with
the required fastener spacing. In a horizontal orientation, the indicated 8-inch and 12-inch fastener spacing in furring shall be achieved by use of two fasteners into studs at 16 inches
and 24 inches on center, respectively.|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 framing and furring shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS.
b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths.
c. The thickness of wood structural panels complying with the specific gravity requirements of Note a shall be permitted to be included in satisfying the minimum required
penetration into framing.
d. Where the required cladding fastener penetration into wood material exceeds3/4 inch and is not more than 11/2 inches, a minimum 2-inch nominal wood furring or an
approved design shall be used.
e.CPC § 8-33 Medium relevance — show source text
Return to Normal – Instructions that all systems and equipment are to be returned to their as-found state at the conclusion of the tests.
Deficiencies – A list of deficiencies and how they were mitigated.
Commissioning Agent Acknowledgment
I have reviewed the test reports listed above and verified that they are complete; these tests have been executed with deficiencies
corrected.
Name: _______________________________________
Company Name (if applicable): ________________________________________
Agent’s Signature: ____________________________ Date: ______________
2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-33
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
CALGreen Commissioning Requirement 5.410.2.5.1, Documentation and Training — Systems Manual
5.410.2.5.1 Systems Manual. [N] Documentation of the operational aspects of the building shall be completed within the systems manual and delivered to the building owner or representative. The systems manual shall include the following:
(See elements checklist below.)
Col1 SYSTEM MANUAL ELEMENTS INCLUDED 1. Site information including facility description, history and current requirements 2. Site contact information 3. Basic operations and maintenance and troubleshooting 4. Systems covered include major systems listed under the BOD 5. Site equipment inventory and maintenance notes 6. Special inspection verifications 7. Other resources and documentation
Owner/Owner’s Representative Signature Date
8-34 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
SYSTEM OPERATIONS TRAINING
COMPLIANCE FORM
CALGreen Commissioning Requirement 5.410.2.5.2, System Operations Training
5.410.2.5.2 Systems Operations Training. [N] A program for training of the appropriate maintenance staff for each equipment type and/or system shall be developed and documented in the commissioning report and shall include the following.
(See elements checklist below.)
The written training program includes the checked elements listed below.
Col1 TRAINING PROGRAM ELEMENTS INCLUDED 1. System/equipment overview (what it is, what it does, and with what other systems and/or equipment it
interfaces) 2. Review and demonstration of servicing and preventive maintenance 3. Review of the information in the systems manual 4. Review of the record drawings on the system/equipment The owner or owner’s representative attests that when the appropriate maintenance staff are made available prior to certificate of occupancy that the written training program was executed with these staff. Or, if appropriate maintenance staff are not available, that the written training program was submitted and approved by the owner or owner’s representative.
Owner/Owner’s Representative Signature Date
2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-35
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
CPC § 1601.5 High relevance — show source text
TABLE 1601.5 MINIMUM ALTERNATE WATER SOURCE TESTING, INSPECTION, AND MAINTENANCE FREQUENCY
DESCRIPTION MINIMUM FREQUENCY
Inspect and clean filters and
screens, and replace (where
necessary).Every 3 months
Inspect and verify that
disinfection, filters, and water
quality treatment devices and
systems are operational and
maintaining minimum water
quality requirements as
determined by the Authority
Having Jurisdiction.In accordance with manufac-
turer’s instructions and the
Authority Having Jurisdiction.
Inspect and clear debris from
rainwater gutters, downspouts,
and roof washers.Every 6 months
Inspect and clear debris from
the roof or another above-
ground rainwater collection
surfaces.Every 6 months
Remove tree branches and
vegetation overhanging a roof
or other aboveground rainwater
collection surfaces.As needed
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
Cross-connection inspection
and test.*After initial installation and
every 12 months thereafter
Test water quality of rainwater
catchment systems required by
Section 1603.4 to maintain a
minimum water quality.Every 12 months. After system
renovation or repair.- The cross-connection test shall be performed in the presence of the Authority Having Jurisdiction in accordance with the requirements of this chapter.
1601.5.1 Maintenance Responsibility. The required maintenance and inspection of rainwater catchment systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.
2025 CALIFORNIA PLUMBING CODE 327
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NONPOTABLE RAINWATER CATCHMENT SYSTEMS
1601.6 Operation and Maintenance Manual. An operation and maintenance manual for rainwater catchment systems required to have a permit in accordance with Section 1601.3, shall be supplied to the building owner by the system designer or installer . The operating and maintenance manual shall include the following:
(1) Diagram(s) of the entire system and the location of system components.
(2) Instructions for operating and maintaining the system.
(3) Instructions on maintaining the required water quality as for rainwater catchment systems .
CPC § 1603.4 High relevance — show source text
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| |
Cross-connection inspection
and test.*|After initial installation and
every 12 months thereafter| |
Test water quality of rainwater
catchment systems required by
Section 1603.4 to maintain a
minimum water quality.|Every 12 months. After system
renovation or repair.|- The cross-connection test shall be performed in the presence of the Authority Having Jurisdiction in accordance with the requirements of this chapter.
1601.5.1 Maintenance Responsibility. The required maintenance and inspection of rainwater catchment systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.
2025 CALIFORNIA PLUMBING CODE 327
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NONPOTABLE RAINWATER CATCHMENT SYSTEMS
1601.6 Operation and Maintenance Manual. An operation and maintenance manual for rainwater catchment systems required to have a permit in accordance with Section 1601.3, shall be supplied to the building owner by the system designer or installer . The operating and maintenance manual shall include the following:
(1) Diagram(s) of the entire system and the location of system components.
(2) Instructions for operating and maintaining the system.
(3) Instructions on maintaining the required water quality as for rainwater catchment systems .
(4) Details startup, shutdown, and deactivating the system for maintenance, repair, or other purposes.
(5) Applicable testing, inspection, and maintenance frequencies in accordance with Section 1601.5.
(6) A method of contacting the installer and/or manufacturer(s).
(7) Directions to the owner or occupant that the manual shall remain with the building throughout the life cycle of the structure.
1601.7 Minimum Water Quality Requirements. The minimum water quality for rainwater catchment systems shall comply with the applicable water quality requirements for the intended application as determined by the Authority Having Jurisdiction. Water quality for nonpotable rainwater catchment systems shall comply with Section 1603.4. In the absence of water quality requirements for harvested rainwa- ter, Table 1603.4 shall apply.
Exceptions:
(1) Water treatment is not required for rainwater catchment systems used for aboveground irrigation with a maximum storage capacity of 360 gallons (1363 L).
(2) Water treatment is not required for rainwater catchment systems used for surface, subsurface or drip irrigation. 1601.8 Material Compatibility. Rainwater catchment systems shall be constructed of materials that are compatible with the type of pipe and fitting materials, water treatment, and water conditions in the system. 1601.9 System Controls. Controls for pumps, valves, and other devices that contain mercury that come in contact with rainwater supply shall not be permitted. 1601.10 Separation Requirements. Underground rainwater catchment service piping shall be separated from the building sewer in accordance with Section 609.2.
CPC § 1505.15. High relevance — show source text
Exception s :
(1) Water treatment is not required for gray water used in a disposal field or for subsurface or subsoil irrigation.
(2) [DWR] Recycled water shall comply with the water quality requirements of Section 1505.15.
2025 CALIFORNIA PLUMBING CODE 309
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ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
TABLE 1501.5 [BSC-CG] RECOMMENDED MINIMUM ALTERNATE WATER SOURCE TESTING, INSPECTION, AND MAINTENANCE FREQUENCY
DESCRIPTION MINIMUM FREQUENCY Inspect and clean filters and screens, and replace
(where necessary).In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or every 3 months.Inspect and verify that disinfection, filters, and
water quality treatment devices and systems are
operational and maintaining minimum water qual-
ity requirements as determined by the Authority
Having Jurisdiction.In accordance with manufacturer’s instructions,
and the Authority Having Jurisdiction.Inspect pumps and verify operation. In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or after installation and every 12 months thereafter.Inspect valves and verify operation. In accordance with manufacturer’s instructions, and/or
Authority Having Jurisdiction, or after installation and every 12 months thereafter.Inspect pressure tanks and verify operation. In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or after installation and every 12 months thereafter.Clear debris from and inspect storage tanks, lock-
ing devices, and verify operation.In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or after installation and every 12 months thereafter.Inspect caution labels and marking. In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or after installation and every 12 months thereafter.Inspect and maintain mulch basins for gray water
irrigation systems.As needed to maintain mulch depth and prevent ponding and runoff. Cross-connection inspection and test* In accordance with this chapter, and/or the
Authority Having Jurisdiction, or after installation and every 12 months thereafter.- The cross-connection test shall be performed in the presence of the Authority Having Jurisdiction in accordance with the requirements of this chapter , unless site conditions do not require it. Alternate testing requirements shall be permitted by the Authority Having Jurisdiction ..
1501.8 Material Compatibility. Alternate water source systems shall be constructed of materials that are compatible with the type of pipe and fitting materials, water treatment, and water conditions in the system.
1501.9 Signage. [BSC-CG, HCD 1, HCD 2 & HCD 1- AC] Signage for on-site treated nonpotable gray water shall comply with Sections 1501.9.1 and 1501.9.2. [DWR] Signage for reclaimed (recycled) water shall comply with Section 1505.13.
CPC § 1501.0 High relevance — show source text
1501.0 General . . . . . . . . . . . . . . . . . . . . .309
1501.1 Applicability . . . . . . . . . . . . . . . . . .309
1501.2 System Design . . . . . . . . . . . . . . .309
1501.3 Permit . . . . . . . . . . . . . . . . . . . . . .309
1501.4 Component Identification . . . . . . .309
1501.5 Maintenance and Inspection . . . .309
1501.6 Operation and Maintenance Manual . . . . . . . . . . . . . . . . . . . . .309
1501.7 Minimum Water Quality Requirements . . . . . . . . . . . . . . . .309
Table 1501.5 Recommended Minimum Alternate Water Source Testing, Inspection, and Maintenance Frequency . . . . . . . . . . . . . . . . . . .310
1501.8 Material Compatibility . . . . . . . . . .310
1501.9 Signage . . . . . . . . . . . . . . . . . . . .310
1501.10 System Controls . . . . . . . . . . . . . .310
1502.0 Inspection and Testing . . . . . . . . .310
1502.1 General . . . . . . . . . . . . . . . . . . . . .310
1502.2 Supply System Inspection and Test . . . . . . . . . . . . . . . . . . . .310
1502.3 Cross-Connection
Inspection and Testing . . . . . . . . .310
1502.4 Separation Requirements . . . . . . .311
1502.5 Abandonment . . . . . . . . . . . . . . . .311
1502.6 Sizing . . . . . . . . . . . . . . . . . . . . . .312
1503.0 Gray Water Systems . . . . . . . . . .312
1503.1 General . . . . . . . . . . . . . . . . . . . . .312
1503.2 System Requirements . . . . . . . . .313
1503.3 Connections to Potable and
Reclaimed (Recycled) Water Systems . . . . . . . . . . . . . . . . . . . . .313
1503.4 Location . . . . . . . . . . . . . . . . . . . .313
1503.5 Plot Plan Submission . . . . . . . . . .313
1503.6 Prohibited Location . . . . . . . . . . . .313
Table 1503.4 Location of Gray Water System . . .314
1503.7 Drawings and Specifications . . . .314
1503.8 Procedure for Estimating Gray Water Discharge . . . . . . . . .314
1503.9 Gray Water System Components . . . . . . . . . . . . . . . . .315
1504.0 Subsurface Irrigation System Zones . . . . . . . . . . . . . . . .316
1504.1 General . . . . . . . . . . . . . . . . . . . . .316
CPC § 1506.11 High relevance — show source text
1506.11 Valves . . . . . . . . . . . . . . . . . . . . . .323
1506.12 Signs . . . . . . . . . . . . . . . . . . . . . . .323
1506.13 Inspection and Testing . . . . . . . . .323
CHAPTER 16 NONPOTABLE RAINWATER
CATCHMENT SYSTEMS . . . . . . .325
1601.0 General . . . . . . . . . . . . . . . . . . . . .327
1601.1 Applicability . . . . . . . . . . . . . . . . . .327
1601.2 System Design . . . . . . . . . . . . . . .327
1601.3 Permit . . . . . . . . . . . . . . . . . . . . . .327
1601.4 Component Identification . . . . . . .327
1601.5 Maintenance and Inspection . . . .327
Table 1601.5 Minimum Alternate Water Source Testing, Inspection, and Maintenance Frequency . . . .327
1601.6 Operation and Maintenance Manual . . . . . . . . . . . . . . . . . . . . .328
1601.7 Minimum Water Quality Requirements . . . . . . . . . . . . . . . .328
1601.8 Material Compatibility . . . . . . . . . .328
1601.9 System Controls . . . . . . . . . . . . . .328
1601.10 Separation Requirements . . . . . . .328
1601.11 Abandonment . . . . . . . . . . . . . . . .328
1601.12 Sizing . . . . . . . . . . . . . . . . . . . . . .328
1602.0 Nonpotable Rainwater Catchment Systems . . . . . . . . . . .328
1602.1 General . . . . . . . . . . . . . . . . . . . . .328
1602.2 Plumbing Plan Submission . . . . . .328
1602.3 System Changes . . . . . . . . . . . . .328
1602.4 Connections to Potable or Reclaimed (Recycled) Water Systems . . . . . . . . . . . . . . .328
1602.5 Initial Cross-Connection Test . . . .328
1602.6 Sizing . . . . . . . . . . . . . . . . . . . . . .328
1602.7 Rainwater Catchment System Materials . . . . . . . . . . . . . . . . . . . .329
1602.8 Rainwater Catchment System Color and Marking Information . . .329
1602.9 Deactivation and Drainage for Cross-Connection Test . . . . . . . . .329
1603.0 Design and Installation . . . . . . . . .329
1603.1 Rainwater Catchment Systems . . .329
1603.2 Outside Hose Bibbs . . . . . . . . . . .329
1603.3 Rainwater Catchment
Collection Surfaces . . . . . . . . . . . .329
1603.4 Minimum Water Quality . . . . . . . .329
CPC § 1501.5.1 High relevance — show source text
Exception: [DWR] Recycled water supply systems that are within or a part of a building shall comply with Section 1505.16 .
1501.5.1 Maintenance Responsibility. The required maintenance and inspection of alternate water source systems shall be the responsibility of the property owner unless otherwise required by the Authority Having Jurisdiction.
1501.6 Operation and Maintenance Manual. [BSC- CG, HCD 1 & DWR] An operation and maintenance manual for gray water, on-site treated nonpotable water , [DWR] and recycled water supply systems required to have a permit in accordance with Section 1501.3, Section 1505.2, and Section 1506.2 shall be supplied to the building owner by the system designer or installer . The operation and maintenance manual shall include the following:
(1) Diagram(s) of the entire system and the location of system components.
(2) Instructions for operating and maintaining the system.
(3) Instructions on maintaining the required water quality for on-site treated nonpotable water systems.
(4) Details on startup, shutdown, and deactivating the system for maintenance, repair, or other purposes.
(5) Applicable testing, inspection, and maintenance frequencies in accordance with Section 1501.5 [DWR] or Section 1505.16 as applicable .
(6) A method of contacting the installer and/or manufacturer(s).
(7) Directions to the owner or occupant that the manual shall remain with the building throughout the life cycle of the structure.
1501.7 Minimum Water Quality Requirements. [BSC- CG, HCD 1 & DWR] The minimum water quality for alternate water source systems shall meet the applicable water quality requirements for the intended application as determined by the Authority Having Jurisdiction. In the absence of water quality requirements, for on-site treated nonpotable systems, the water quality requirements of IAPMO IGC 324 or NSF/ANSI 350 shall apply. [BSC-CG & HCD 1] Water quality requirements for on-site treated nonpotable graywa- ter shall comply with this section and Section 1506.10.2.
Exception s :
(1) Water treatment is not required for gray water used in a disposal field or for subsurface or subsoil irrigation.
(2) [DWR] Recycled water shall comply with the water quality requirements of Section 1505.15.
2025 CALIFORNIA PLUMBING CODE 309
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ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
TABLE 1501.5 [BSC-CG] RECOMMENDED MINIMUM ALTERNATE WATER SOURCE TESTING, INSPECTION, AND MAINTENANCE FREQUENCY
DESCRIPTION MINIMUM FREQUENCY Inspect and clean filters and screens, and replace
(where necessary).In accordance with manufacturer’s instructions, and/or the
Authority Having Jurisdiction, or every 3 months.Inspect and verify that disinfection, filters, CPC § 1505.14.2.1 Medium relevance — show source text
(1) Notify the Authority Having Jurisdiction of the cross-connection.
(2) The reclaimed (recycled) water piping to the building and its premises shall be shut down at the meter, and the reclaimed (recycled) water riser shall be drained.
(3) Potable water piping to the building and its premises shall be shut down at the meter.
(4) The cross-connection shall be uncovered and disconnected.
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ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
(5) The building and its premises shall be retested in accordance with Section 1505.14.2.1 and
Section 1505.14.2.2.
(6) The potable water system shall be chlorinated with 50 parts-per-million (ppm) chlorine for 24 hours.
(7) The potable water system shall be flushed after 24 hours, and a standard bacteriological test shall be performed. Where test results are acceptable, the potable water system shall be permitted to be recharged. 1505.14.2.4 Periodic Inspection. Periodic visual inspections of recycled water supply systems shall be required by the recycled water supplier or designee following the procedures in Section 1505.14.2.1. Pursuant to California Code of Regu- lations, Title 22, Section 60316, annual visual inspections shall be required for recycled water sup- ply systems that are within or a part of a building. 1505.15 Minimum Water Quality Requirements for Reclaimed (Recycled) Water. The minimum water qual- ity for reclaimed (recycled) water shall meet the applicable water quality requirements of California Code of Regulations, Title 22, Division 4, Chapter 3 (commencing with Section 60301) for disinfected tertiary recycled water and the appli- cable reclaimed (recycled) water use. The reclaimed (recy- cled) water supplier shall supply water in accordance with permits issued by the State Water Resources Control Board or Regional Water Quality Control Board. 1505.16 Maintenance and Inspection. Recycled water supply systems and components shall be inspected and main- tained in accordance with the manufacturer’s recommendations and/or as required by the Authority Having Jurisdiction. The frequency of testing, inspection, and maintenance shall be in accordance with Table 1505.16. The required inspection and maintenance shall be the responsibility of the property owner, unless otherwise required by the Authority Having Jurisdiction.
1506.0 On-Site Treated Nonpotable Gray Water Sys- tems.
1506.1 General. The provisions of this section shall apply to the installation, construction, alteration, and repair of onsite treated nonpotable gray water systems intended to supply uses such as water closets, urinals, trap primers for floor
drains and floor sinks, above and belowground irrigation, and other uses approved by the Authority Having Jurisdiction.
Frequently asked questions
Who must keep the maintenance records and where do they need to be stored?
The property owner is responsible for maintaining the records (unless the AHJ assigns otherwise). Records and the maintenance log must be available for inspection by the AHJ; Appendix K specifically requires retention of water quality test records for at least 2 years for potable rainwater.
Are the table frequencies absolute or can the manufacturer require more frequent actions?
The tables establish minimum frequencies. The manufacturer’s instructions and any AHJ requirements may require more frequent maintenance; those take precedence. See Table 1601.5 and Table 1501.5 language.
Is an O&M manual mandatory, and what must it include?
Yes — an O&M manual is mandatory for systems requiring a permit. It must include system diagrams, operating and maintenance instructions, water‑quality maintenance instructions, deactivation procedures, applicable inspection/maintenance/testing frequencies, and installer/manufacturer contacts. See § 1601.6 and § 1501.6.
How often must cross‑connection testing occur and who must witness it?
Cross‑connection inspection and testing is required after initial installation and every 12 months thereafter per Table 1601.5; the test is required to be performed in the presence of the AHJ unless the AHJ permits alternate arrangements. Coordinate scheduling with the AHJ.
What if my system only serves aboveground irrigation?
There are specific exceptions for very small irrigation systems in Chapter 16 and Chapter 15 (treatment may not be required for some small aboveground irrigation uses). Confirm the exception details with the AHJ and check § 1601.7 and relevant exceptions in Chapter 15.
More in California Plumbing Code
- Administration
- Definitions
- General Regulations
- Plumbing Fixtures and Fixture Fittings
- Water Heaters
- Water Supply and Distribution
- Sanitary Drainage (Drain, Waste, and Vent)
- Indirect Wastes
- Vents
- Traps and Interceptors
- Storm Drainage
- Fuel Gas Piping
- Health Care Facilities — Medical Gas and Medical Vacuum Systems
- Alternate Water Sources and Nonpotable Rainwater Catchment Systems
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