HomeMy WebLinkAboutOrdinance 5677
Ordinance No. 5677
Ordinance of the Council of the City of Palo Alto Repealing
Chapter 16.08 of the Palo Alto Municipal Code and Amending Title
16 to Adopt a New Chapter 16.08, California Plumbing Code, 2025
Edition, and Local Amendments and Related Findings
The Council of the City of Palo Alto does ORDAIN as follows:
SECTION 1. Chapter 16.08 of the Palo Alto Municipal Code is hereby amended by
repealing in its entirety 16.08 and adopting a new Chapter 16.08 to read as follows:
CHAPTER 16.08
CALIFORNIA PLUMBING CODE,
CALIFORNIA CODE OF REGULATIONS, TITLE 24, PART 5
Sections
16.08.010 2025 California Plumbing Code, Title 24, Part 5 adopted and amended.
16.08.020 Cross - References to California Plumbing Code.
16.08.030 Local Amendments.
16.08.040 Administration & Enforcement of 2025 California Plumbing Code.
16.08.050 Adoption of Chapter 1, Division II Administration.
16.08.060 Section 102.8 Appendices.
16.08.070 Section 306.3 Palo Alto sewer use.
16.08.080 Section 701.2, (4) Drainage piping.
16.08.090 Section 719.7 Cleanouts.
16.08.100 Section 808.2 Single pass cooling water systems prohibited.
16.08.110 Section 1014.1 Grease Interceptors - General.
16.08.115 Section 1014.2.1.1 Grease Capacity
16.08.120 Section 1101.4 Material use.
16.08.130 Section 1101.4.1 Copper and copper alloys.
16.08.140 Section 1101.4.2 Conductors.
16.08.150 Section 1101.4.3 Leaders.
16.08.160 Section 1102.1 Applications.
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16.08.010 2025 California Plumbing Code, Title 24, Part 5 adopted and amended.
The California Plumbing Code, 2025 Edition, Title 24, Part 5 of the California Code of Regulations
together with those omissions, amendments, exceptions and additions thereto, is adopted and
hereby incorporated in this Chapter by reference and made a part hereof the same as if fully set
forth herein.
Unless superseded and expressly repealed, references in City of Palo Alto forms, documents
and regulations to the chapters and sections of the former editions of the California Code of
Regulations, Title 24, shall be construed to apply to the corresponding provisions contained
within the California Code of Regulations, Title 24, 2025. Ordinance No. 5567 of the City of
Palo Alto and all other ordinances or parts of ordinances in conflict herewith are hereby
suspended and expressly repealed.
Wherever the phrases "California Plumbing Code" or "Plumbing Code" are used in this code
or any ordinance of the City, such phrases shall be deemed and construed to refer and apply
to the California Plumbing Code, 2025 Edition, Title 24, Part 4 of the California Code of
Regulations, as adopted by this Chapter.
One copy of the California Plumbing Code, 2025 edition, has been filed for use and examination
of the public in the Office of the Building Official of the City of Palo Alto.
16.08.020 Cross - References to California Plumbing Code.
The provisions of this Chapter contain cross-references to the provisions of the California
Plumbing Code, 2025 Edition, in order to facilitate reference and comparison to those
provisions.
16.08.030 Local Amendments.
The provisions of this Chapter shall constitute local amendments to the cross-referenced
provisions of the California Plumbing Code, 2025 Edition, and shall be deemed to replace the
cross- referenced sections of said Code with the respective provisions set forth in this Chapter.
Where used in this Chapter 16.08, ellipses shall indicate text of the California Plumbing Code,
2025 Edition, that has been adopted without amendment but is omitted for brevity.
16.08.040 Administration & Enforcement of 2025 California Plumbing Code.
Administration and enforcement of this code shall be governed by Chapter 1, Division II of
the 2025 California Building Code as amended by Palo Alto Municipal Code Chapter 16.04.
16.08.050 Adoption of Chapter 1, Division II Administration.
Chapter 1, Division II Administration of the 2025 California Plumbing Code is adopted by the
City of Palo Alto to supplement, to the extent it does not conflict with, Chapter 1, Division II
of the 2025 California Building Code as amended.
16.08.060 Section 102.8 Appendices.
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The following Appendix Chapters of the California Plumbing Code, 2025 Edition, are adopted
and hereby incorporated in this Chapter by reference and made a part hereof the same as if
fully set forth herein:
A. Appendix A – Recommended rules for sizing the water supply system
B. Appendix D – Sizing storm water drainage systems
16.08.070 Section 306.3 Palo Alto sewer use.
Section 306.3 of Chapter 3 of the California Plumbing Code is added to read:
306.3 Palo Alto sewer use. All non-domestic waste shall comply with the City of Palo Alto Sewer
Use Ordinance (Palo Alto Municipal Code Chapter 16.09). Where discrepancies exist between
the requirements of this code and said ordinance, the provisions of said ordinance shall apply.
16.08.080 Section 701.2, (4) Drainage piping.
Subdivsion (4) of Section 701.2 of Chapter 7 of the California Plumbing Code is amended to
read:
701.2 Drainage Piping
Materials for drainage piping shall be in accordance with one of the referenced
standards in Table 701.2 except that:
[. . .]
(4) Copper, copper alloys, lead and lead alloys, including brass, shall not be used for
building sanitary drainage lines, connectors or seals coming in contact with sewage
except for domestic waste sink traps and short lengths of associated connecting pipes
where alternate materials are impracticable.
Where permitted by the building official or their designee, copper tube for drainage
piping shall have a weight of not less than that of copper drainage tube type DWV.
[. . .]
16.08.090 Section 719.7 Cleanouts.
Section 719.7 of Chapter 7 of the California Plumbing Code is added to read:
719.7 Cleanouts. A cleanout shall be provided at the point of connection between the
building sewer and the city lateral and an approved fitting shall be used to bring the
cleanout riser to grade. Where sewer cleanouts are to be connected to existing city
laterals, such connections shall be accomplished by use of a City of Palo Alto Utility
approved fitting.
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16.08.100 Section 808.2 Single pass cooling water systems prohibited.
Section 808.2 of Chapter 8 of the California Plumbing Code is added to read:
808.2 Single pass cooling water systems prohibited. Clean running water used
exclusively as a cooling medium in an appliance, device, or apparatus is prohibited.
Refer to PAMC 16.14.350 for additional CALGreen measures.
16.08.110 Section 1014.1 Grease Interceptors - General
Section 1014.1 of Chapter 10 of the California Plumbing Code is amended to read as follows
(additions to the 2025 California Plumbing code are underlined, deletions are struck through):
1014.1 General. Where it is determined by the Authority Having Jurisdiction that
waste pretreatment is required, an approved type of grease interceptor(s) shall
comply with ASME A112.14.3, ASME A112.14.4, CSA B481, ANSI/CAN/IAPMO Z1001,
PDI G-101, or PDI G-102, and sized in accordance with Sections 1014.2.1 and
1014.2.1.1 or Section 1014.3.6, shall be installed in accordance with the
manufacturer’s installation instructions to receive the drainage from fixtures or
equipment that produce grease-laden waste. Grease-laden waste fixtures shall
include, but not be limited to, sinks and drains, such as floor drains, floor sinks, and
other fixtures or equipment in serving establishments, such as restaurants, cafes,
lunch counters, cafeterias, bars and clubs, hotels, hospitals, sanitariums, factory or
school kitchens, or other establishments where grease is introduced into the drainage
or sewage system in quantities that can effect line stoppage or hinder sewage
treatment or private sewage disposal systems. A combination of hydromechanical,
gravity grease interceptors and engineered systems shall be allowed to meet this code
and other applicable requirements of the Authority Having Jurisdiction where space
or existing physical constraints of existing buildings necessitate such installations. A
grease interceptor shall not be required for individual dwelling units or private living
quarters. Water closets, urinals, and other plumbing fixtures conveying human waste
shall not drain into or through the grease interceptor.
[…]
1014.1.2 Maintenance. Grease interceptors shall be maintained in efficient operating
condition by periodic removal of the accumulated grease and latent material. No such
collected grease shall be introduced into drainage piping or a public or private sewer.
Where the Authority Having Jurisdiction determines that a grease interceptor is not
being properly cleaned or maintained, the Authority Having Jurisdiction shall have the
authority to mandate the installation of additional equipment or devices. The
Authority Having Jurisdiction shall have the authority and to mandate a maintenance
program for grease interceptors.
1014.1.3 Food Waste Disposers and Dishwashers.
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Unless specifically required or permitted by the Authority Having Jurisdiction, no No
food waste disposer or dishwasher shall be connected to or discharge into a grease
interceptor. Commercial food waste disposers shall be permitted to discharge directly
into the building’s drainage system. Commercial Food Waste Disposal Units are
prohibited.
Exception: Food waste disposers shall be permitted to discharge to grease
interceptors that are designed to receive the discharge of food waste.
1014.1.4 Wastewater Discharge through Grease Interceptors. Wastewater
Discharge through grease interceptors shall be by means of gravity only. Unless
otherwise approved by the Authority Having Jurisdiction, mechanical pumping of
wastewater through a grease interceptor shall not be allowed. Pumps and/or other
mechanical pumping equipment to convey wastewater shall only be installed to
convey wastewater after the wastewater has passed through the grease interceptor.
1014.1.5 Two-Way Lateral Cleanouts. Two-way Lateral cleanouts shall be installed on
the inlet and outlet sides of grease interceptors for ease of maintenance and flushing
of the lateral line(s).
1014.1.6 Acceptable Materials. Grease interceptors made of the following materials
shall not be installed in the City: materials susceptible to corrosion in low pH
environments, concrete, metal, and acid-resistant enamel or epoxy (A.R.E.) coatings.
Examples of acceptable materials of construction include thermoplastic (low or high-
density polyethylene) or similar non-corrosive materials.
1014.1.7 Sharing of Grease Interceptors Prohibited. Unless specifically required or
permitted by the Authority Having Jurisdiction, a grease interceptor may be used by
only one food facility. Sharing grease interceptors between multiple food facilities is
prohibited.
16.08.115 Section 1014.2.1.1 Grease Capacity
Section 1014.2.1.1 of Chapter 10 of the California Plumbing Code is added to read:
1014.2.1.1 Grease Capacity. In addition to the sizing criteria based on flow rate specified
in Section 1014.2.1, hydromechanical grease interceptors shall meet the sizing criteria
based on grease capacity outlined in the “Palo Alto Regulations for Food Facilities
Related to Water Pollution Prevention and Management of Fats, Oils, and Grease.” The
correctly sized grease interceptor will have both the minimum flow rate determined
according to Section 1014.2.1 and the minimum grease storage capacity determined
according to this section.
16.08.120 Section 1101.4 Material use.
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Section 1101.4 of Chapter 11 of the California Plumbing Code is amended to read:
1101.4 Material use. Pipe, tube, and fittings conveying rainwater shall be of such
materials and design as to perform their intended function to the satisfaction of
the Authority Having Jurisdiction. Conductors within a vent or shaft shall be of cast-
iron, galvanized steel, wrought iron, Schedule 40 ABS DWV, Schedule 40 PVC DWV,
stainless steel 304 or 316L [stainless steel 304 pipe and fittings shall not be installed
underground and shall be kept not less than 6 inches (152 mm)
aboveground], or other approved materials, and changes in direction shall be in
accordance with the requirements of Section 706.0. ABS and PVC DWV piping
installations shall be installed in accordance with applicable standards referenced in
Chapter 17 and the firestop protection requirements in the California Building Code.
Except for individual single- family dwelling units, materials exposed within ducts or
plenums shall have a flame- spread index of not more than 25 and a smoke-developed
index of not more than 50, where tested in accordance with ASTM E84 or UL 723.
Plastic piping installed in plenums shall be tested in accordance with all requirements
of ASTM E84 or UL 723. Mounting methods, supports and sample sizes of materials for
testing that are not specified in ASTM E84 or UL 723 shall be prohibited.
[HCD 1 & HCD 2] ABS or PVC installations are limited to not more than two stories of
areas of residential accommodation.
[OSHPD 1, 2, 3 & 4] ABS and PVC installations are not allowed.
16.08.130 Section 1101.4.1 Copper and copper alloys.
Section 1101.4.1 of Chapter 11 of the California Plumbing Code is amended to read:
1101.4.1 Copper and copper alloys. Joints and connections in copper and copper
alloy pipe and tube is prohibited.
16.08.140 Section 1101.4.2 Conductors.
Section 1101.4.2 of Chapter 11 of the California Plumbing Code is amended to read:
1101.4.2 Conductors. Conductors installed aboveground in buildings shall comply with
the applicable standards referenced in Table 701.2 for aboveground drain, waste, and
vent pipe. Conductors installed aboveground level shall be of Schedule 40 copper pipe or
Schedule 40 copper alloy pipe; service weight cast-iron soil pipe or hubless cast-iron
soil pipe; standard weight galvanized steel pipe; stainless steel 304 or 316L [stainless
steel 304 pipe and fittings shall not be installed underground and shall be kept not less
than 6 inches (152 mm) aboveground], or Schedule 40 ABS or Schedule 40 PVC plastic
pipe.
16.08.150 Section 1101.4.3 Leaders.
Section 1101.4.3 of Chapter 11 of the California Plumbing Code is amended to read:
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1101.4.3 Leaders. Leaders installed outside shall be in accordance with the applicable
standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe;
aluminum sheet metal; or galvanized steel sheet metal.
16.08.160 Section 1102.1 Applications.
Section 1102.1 of Chapter 11 of the California Plumbing Code is amended to read:
1102.1 Applications. Roof drains shall be constructed of aluminum, cast-iron, stainless
steel, ABS, PVC, polypropylene, polyethylene, or nylon and shall comply with ASME
A112.3.1 or ASME A112.6.4.
SECTION 2. The Council adopts the findings for local amendments to the California
Plumbing Code, 2025 Edition, attached hereto as Exhibit “A” and incorporated herein by
reference.
SECTION 3. The Council finds that, with the exception of the changes codified at
PAMC Section 16.08.110 and 16.08.115, the changes or modifications to the California Plumbing
Code adopted by this ordinance are substantially equivalent to changes or modifications that
were previously filed by the governing body of the City and were in effect as of September 30,
2025, and are therefore exempt from the moratorium on new residential building standards
imposed by Assembly Bill (AB) 130 (2025). The changes codified at PAMC Section 16.08.110 and
16.08.115 do not affect residential units and are therefore not subject to the AB 130
moratorium.
SECTION 4. The Council finds that this project is exempt from the provisions of the
California Environmental Quality Act (“CEQA”) pursuant to Section 15308 of the CEQA
Guidelines, because it is an action by the City as a regulatory body for the protection of the
environment, and Section 15061 of the CEQA Guidelines, because it can be seen with certainty
that there is no possibility that the amendments herein adopted will have a significant effect
on the environment.
SECTION 5. If any section, subsection, clause or phrase of this Ordinance is for any
reason held to be invalid, such decision shall not affect the validity of the remaining portion or
sections of the Ordinance. The Council hereby declares that it should have adopted the
Ordinance and each section, subsection, sentence, clause or phrase thereof irrespective of the
fact that any one or more sections, subsections, sentences, clauses or phrases be declared
invalid.
//
//
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____________________________ ____________________________
____________________________
____________________________
____________________________
SECTION 6. This Ordinance shall be effective on the thirty-first day after the date of its
adoption.
INTRODUCED: OCTOBER 6, 2025
PASSED: OCTOBER 20, 2025
AYES: BURT, LAUING, LU, LYTHCOTT-HAIMS, RECKDAHL, STONE, VEENKER
NOES:
ABSENT:
ABSTENTIONS:
ATTEST:
____________________________ ____________________________
City Clerk Mayor
APPROVED AS TO FORM: APPROVED:
City Attorney or Designee City Manager
Director of Planning and
Development Services
Director of Administrative Services
Director of Public Works
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Exhibit A
FINDINGS FOR LOCAL AMENDMENTS TO CALIFORNIA PLUMBING CODE,
TITLE 24, PART 5
Section 17958 of the California Health and Safety Code provides that the City may make changes
to the provisions of the California Building Standards Code. Sections 17958.5 and 17958.7 of the
Health and Safety Code require that for each proposed local change to those provisions of the
California Building Standards Code which regulate buildings used for human habitation, the City
Council must make findings supporting its determination that each such local change is reasonably
necessary because of local climatic, geological, or topographical conditions.
Local building regulations having the effect of amending the uniform codes, which were adopted
by the City prior to November 23, 1970, were unaffected by the regulations of Sections 17958,
17958.5 and 17958.7 of the Health and Safety Code. Therefore, amendments to the uniform
codes which were adopted by the City Council prior to November 23, 1970 and have been carried
through from year to year without significant change, need no required findings. Also,
amendments to provisions not regulating buildings used for human habitation do not require
findings.
Code: California Plumbing Code, Title, 24, Part 5
Chapter(s),
Sections(s),
Appendices
Title Added Amended Replaced Justification
(See below
for keys)
Ch. 1, Div. II ADMINSTRATION A
Administration and Enforcement A
306.3 Palo Alto sewer use C
701.2 (4) Drainage piping C
719.7 Cleanouts C
808.2 Single pass cooling water systems C
prohibited
1014.1 Grease Interceptors - General C, T
1014.2.1.1 Grease Capacity C, T
1101.4 Material use C
1101.4.1 Copper and copper alloys C
1101.4.2 Conductors C
1101.4.3 Leaders C
1102.1 Applications C
Appx. A Recommended rules for sizing the water
supply system
A, C, T
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Appx. D Sizing storm water drainage systems A, C, T
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C
Key to Justification for Amendments to Title 24 of the California Code of Regulations
A This is an administrative amendment to clarify and establish civil and administrative
procedures, regulations, or rules to enforce and administer the activities by the Palo Alto Building
Inspection Department. These administrative amendments do not need to meet HSC
18941.5/17958/13869 per HSC 18909(c).
This amendment is justified based on a local climatic condition. The seasonal climatic
conditions during the late summer and fall create severe fire hazards to the public health and
welfare in the City. The hot, dry weather frequently results in wild land fires on the brush covered
slopes west of Interstate 280. The aforementioned conditions combined with the geological
characteristics of the hills within the City create hazardous conditions for which departure from
California Building Standards Code is required. In addition, Palo Alto’s local climatic conditions
create unique challenges for grease management in the sewer system. Heavy winter rains
contribute to infiltration and inflow, increasing flows that reduce the system’s tolerance for
blockages and making effective grease control devices (GCDs)critical to preventing backups and
overflows. Seasonal temperature variations further exacerbate the risk: hot summer conditions
can liquefy grease, allowing it to migrate through pipes, while cooler winter conditions cause
grease to solidify, increasing the likelihood of blockages. Bay-influenced humidity and saline air
accelerate corrosion of interceptor components and piping, making it necessary to prohibit
materials susceptible to corrosion in low-pH environments to ensure long-term reliability of
GCDs.
G This amendment is justified based on a local geological condition. The City of Palo Alto is
subject to earthquake hazard caused by its proximity to San Andreas fault. This fault runs from
Hollister, through the Santa Cruz Mountains, epicenter of the 1989 Loma Prieta earthquake, then
on up the San Francisco Peninsula, then offshore at Daly City near Mussel Rock. This is the
approximate location of the epicenter of the 1906 San Francisco earthquake. The other fault is
Hayward Fault. This fault is about 74 mi long, situated mainly along the western base of the hills
on the east side of San Francisco Bay. Both faults are considered major Northern California
earthquake faults which may experience rupture at any time. Thus, because the City is within a
seismic area which includes these earthquake faults, the modifications and changes cited herein
are designed to better limit property damage as a result of seismic activity and to establish criteria
for repair of damaged properties following a local emergency.
T The City of Palo Alto topography includes hillsides with narrow and winding access, which
makes timely response by fire suppression and emergency response vehicles difficult. Palo Alto
is contiguous with the San Francisco Bay, resulting in a natural receptor for storm and wastewater
run-off. Also, the City of Palo Alto is located in an area that is potentially susceptible to
liquefaction during a major earthquake. The surface condition consists mostly of stiff to dense
sandy clay, which is highly plastic and expansive in nature. The aforementioned conditions within
the City create hazardous conditions for which departure from California Building Standards Code
is warranted. In addition, much of Palo Alto has very low slope gradients. In flatter areas, sanitary
sewer lines experience reduced flow velocity. This condition increases the risk of grease
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accumulation and blockages in the system, making the use of appropriately sized grease
interceptors more critical.
Docusign Envelope ID: D173783A-121D-49F3-B499-7ED8B9E399CB
Certificate Of Completion
Envelope Id: D173783A-121D-49F3-B499-7ED8B9E399CB Status: Completed
Subject: ORD 5677 - Adopting a New Chapter 16.08, CA Plumbing Code
Source Envelope:
Document Pages: 12 Signatures: 7 Envelope Originator:
Certificate Pages: 2 Initials: 0 Christine Prior
AutoNav: Enabled
EnvelopeId Stamping: Enabled
Time Zone: (UTC-08:00) Pacific Time (US & Canada)
250 Hamilton Ave
Palo Alto , CA 94301
Christine.Prior@PaloAlto.gov
IP Address: 165.225.242.110
Record Tracking
Status: Original
11/3/2025 2:58:49 PM
Holder: Christine Prior
Christine.Prior@PaloAlto.gov
Location: DocuSign
Security Appliance Status: Connected Pool: StateLocal
Storage Appliance Status: Connected Pool: City of Palo Alto Location: Docusign
Signer Events Signature Timestamp
Madeleine Salah
Madeleine.Salah@paloalto.gov
Deputy City Attorney
City of Palo Alto
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Brad Eggleston
Brad.Eggleston@paloalto.gov
Director of Public Works
City of Palo Alto
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Lauren Lai
Lauren.Lai@paloalto.gov
Director Administrative Services/CFO
COPA
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Jonathan Lait
Jonathan.Lait@paloalto.gov
Director, Planning and Development Services
City of Palo Alto
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Ed Shikada
Ed.Shikada@paloalto.gov
Ed Shikada
City of Palo Alto
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Signed using mobile
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Ed Lauing
Ed.Lauing@paloalto.gov
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Mahealani Ah Yun
Mahealani.AhYun@paloalto.gov
City Clerk
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Signing Complete Security Checked 11/12/2025 9:04:57 AM
Completed Security Checked 11/12/2025 9:04:57 AM
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