San Marcos, CA Building Safety: Plumbing Permits (2026)
Key Facts
- Adopted code
- 2025 California Plumbing Code, Title 24 Part 5
- Based on
- 2021 Uniform Plumbing Code, Chapters 1-17
- Water softener rule
- No saline discharge into sewer or waterways
- Storm water rule
- No discharge into City storm drain system
- BMP devices
- Cannot be abandoned, modified, or removed
Summary
San Marcos plumbing permits run on the 2025 California Plumbing Code, adopted by reference under Municipal Code Section 17.16.010 and based on the 2021 Uniform Plumbing Code. Local amendments in the same chapter ban saline-discharging water softeners and outlaw dumping anything into the City's storm water system.
The 2025 California Plumbing Code, California Code of Regulations, Title 24, Part 5, based on the Uniform Plumbing Code 2021 Edition, Chapters 1 through 17, and Appendices Chapter A, B, D, E, F, G, I and K and the Installation Standards, published by the International Association of Plumbing and Mechanical Officials are adopted by reference subject to amendments contained in this Chapter.
(Ord. No. 2019-1478, Exh. A, § 1.E, 10-22-2019; Ord. No. 2022-1526, § 1.E(Exh. A), 10-25-2022; Ord. No. 2025-1575, § 1.E(Exh. B), 1-13-2026)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 14 Update 1).
Full Breakdown
010 adopts the 2025 California Plumbing Code, California Code of Regulations Title 24 Part 5, based on the 2021 Uniform Plumbing Code, Chapters 1 through 17, plus Appendices A, B, D, E, F, G, I, and K and the Installation Standards published by the International Association of Plumbing and Mechanical Officials, subject to San Marcos's own amendments. 7 to make it unlawful to install or replace any plumbing equipment, including an automatic or self-regenerating water softener unit, whose operation could discharge saline waste into the sewer system or pollute any surface or underground stream, watercourse, lake, or other body of water; this targets self-regenerating softeners that periodically flush concentrated brine.
3, making it unlawful to discharge any material, directly or indirectly, into the City's storm water conveyance system, or to abandon, modify, remove, or destroy a Best Management Practice device installed to control storm water pollutants, unless done consistent with the City's Storm Water Management Program, the permit issued by the Regional Water Quality Control Board, or other federal or state law; any modification to a storm water conveyance system needs City approval first.
Violations & Fines
Installing a saline-discharging water softener or dumping material into the storm drain system violates Sections 17.16.030 and 17.16.040 and is enforced alongside standard Building Code permit violations: the Building Official can require removal of noncompliant equipment, order restoration of any damaged Best Management Practice device, and withhold plumbing permit approval until the installation is corrected, in addition to any separate enforcement the Regional Water Quality Control Board pursues under its own storm water permit.
Frequently Asked Questions
What plumbing code does San Marcos enforce?
Are self-regenerating water softeners legal in San Marcos?
Can I connect a sump pump or condensate line to the storm drain?
Sources & Official References
Other rules in San Marcos
California rules heatmap·Compare San Marcos to another location·View the California building safety overview
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