Lynwood — Ch. 18 Art. II Minimum Standards Codes § 18-148
Amendments to adopted code
Operative Text
The plumbing code adopted above, shall be amended by the following: Sewer and water service: Public water main or public sewer shall be considered available to a building when the building is located within 400 feet of the public main or sewer. Section 890.210. "PEX-pipe may be used as a material in the interior of homes". Section 890.410, TRPS. Add "Every fixture shall have its own trap". Section 890.410(e). Delete entirely. Section 890.420(f,1). Insert "All buildings shall have outside clean-outs for sewer". Section 890.520. Floor drains in any garage require triple basin. Section 890.910. Add "As per manufacturer". Section 890.910. Add "Secure laundry tub at all four legs". Section 890.1120(b). All underground sprinkler systems shall use an RPZ backflow preventer outside of building with unions to be disconnected during cold season. If installed inside the building, the RPZ must be near or at a floor drain. Section 890.1130(6g). Expansion tank has to be installed at water heater on cold water pipe between tank and valve. Section 890.1150(1). Sewer and water must have a ten-foot minimum separation. Section 890.1150(3). Water service C five feet below grade. Section 890.1190(b). Flare fitting on street side of service and full port, gate or ball valves. Section 890.1200. Insert "Minimum water service - one inch in diameter type k copper". Section 890.1210. Add "Hot and cold waterlines require full size risers with 24-inch air chambers". Section 890.1210(f). Add "Air chamber 1 = B0 minimum in length for all plumbing fixtures". Section 890.1320(c). House sewer shall be no less than four feet below grade. Section 890.1320(f). One-fourth-inch pitch on horizontal waste pipes up to three inches in diameter. Section 890.1320(g). One-eighth-inch pitch on larger pipes. Section 890-1320(j) and (m). Cottage tees, crosses, utility tees are not allowed. Section 890.1320. Add "Washing machines located on second floor or higher must be installed inside a pan with a two vented P-trap". Section 890.1330(a). Minimum size pipes for bathtubs, showers, kitchen sinks and laundry tubs shall be two inches in diameter. Section 890.1340(b)4). All underground sanitary plumbing shall be four inches in diameter except for venting. Section 890.1340(e). Waste lines and vents shall be installed for future fixtures. Section 890.1370(1). All floor drains shall be vented. Section 890.1370(3). Each bathroom in commercial or public buildings having masonry or concrete floors shall have vented floor drains. Section 890.1500. Delete entire section. (Wet venting is not permitted.) Section 890.1510. Delete entire section. (Wet venting is not permitted.) Section 890.1520. Delete entire section. (Wet venting is not permitted.) Section 890.1580. Add "No vent shall be less than two inches in diameter when carried to open air with 2 x 3 increaser to terminate above the roof line". Section 890.1580. Delete b), c) and d). Section 890.1370(2). Sump basin shall be two inches above floor heights. Section 890.1920. Air or water test of the plumbing system shall be as needed. Section 890. Appendix, table A. Approved materials for water service pipe. 3) and 6). Below ground water pipe shall be of ductile iron or type AK copper. Section 890, Appendix, table A. Above ground water pipe shall be of type AL copper. Delete all plastic pipe references. Plastic pipe is not permitted. Section 890, Appendix A, table L. Minimum vent size shall be no less than 1½-inch diameter.
Section 18-148 of Lynwood's Chapter 18, Article II modifies the locally adopted plumbing code by adding, deleting, or replacing numerous specific technical requirements. These amendments govern materials, pipe sizing, installation depths, venting configurations, backflow prevention, and related plumbing standards for buildings within the city. The changes collectively establish stricter or more specific local standards than the base code, such as prohibiting plastic pipe, banning wet venting, and requiring minimum pipe diameters and burial depths.
Plain English — not legal advice.
Property owners and managers operating in Lynwood must ensure that any plumbing work on their buildings conforms to the locally amended code under § 18-148, not just the base adopted plumbing code. Compliant operators typically verify that contractors use approved materials—such as type K copper for water service and ductile iron or type AK copper below grade—and follow the specific requirements for pipe sizing, burial depth, venting, backflow preventers, and clean-outs. Engaging licensed plumbers familiar with Lynwood's local amendments under Ch. 18 Art. II § 18-148 is a common practice for ensuring inspections and permits proceed without issue.
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
Tenants in Lynwood have an interest in knowing that § 18-148 sets detailed minimum plumbing standards that landlords must meet, covering everything from pipe materials and venting to sewer separation and backflow prevention. If a rental unit appears to have substandard or non-compliant plumbing—such as improper drainage, inadequate venting, or prohibited materials—tenants may consider contacting the City of Lynwood's building or code enforcement department to report potential violations. Tenant-rights organizations can also help residents understand how plumbing code violations under Ch. 18 Art. II may relate to habitability rights and what general options exist for addressing them.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated November 9, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
Effective Timeline
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