San Marcos, CA Environmental Rules: Stormwater Management (2026)
Key Facts
- Governing chapter
- Municipal Code Ch. 14.15
- Illegal discharge
- Prohibited unless NPDES-permitted
- Construction cleaning
- Required before each Wet Season
- Spill notification
- County Hazmat notified within 24 hours
- Charge level
- Misdemeanor, chargeable as infraction
Summary
San Marcos bans any illegal discharge into its storm drain system under Municipal Code Chapter 14.15. Businesses, construction sites and residents must keep pollutants such as wash water, pool chemicals, paint and pet waste out of gutters and storm drains, and violators face misdemeanor charges with fines up to $1,000 per day.
Illegal or Illicit Discharges to the Storm Water Conveyance System are prohibited, except that the following discharges are exempt from the prohibition set forth above: (a)Any discharge regulated under a NPDES Permit issued to the Discharger and administered by the State of California pursuant to Chapter 5.5, Division 7 of the California Water Code, provided that the Discharger is in compliance with all requirements of the Permit and other applicable laws and regulations. (b)Any discharge which the Director and the Regional Water Quality Control Board determine is necessary for the protection of the public health and safety.
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
15, the Storm Water Management and Discharge Control ordinance, prohibits any "Illegal or Illicit Discharge" to the city's Storm Water Conveyance System except discharges covered by a valid NPDES permit or those the Director and Regional Water Quality Control Board find necessary for public health and safety (Sec. 030). Establishing or maintaining an illegal connection to the storm drain system is separately banned under Sec. 040. 050 requires every discharger whose activity may add pollutants to storm water to implement Best Management Practices to the Maximum Extent Practicable, and lists prohibited discharges by name, including wash water from vehicle or equipment cleaning, chlorinated pool or fountain water, grease and food-processing waste, and sediment or pet waste.
Industrial, commercial and construction operators may be required to prepare a Storm Water Pollution Prevention Plan (SWPPP) documenting site controls, employee training and spill response procedures. Property owners along a watercourse must keep it free of trash and debris and may not modify its natural flow or build within 30 feet of a creek centerline (Sec. 060). Authorized Enforcement Officials may inspect premises, take samples, photograph violations and order corrective action plans (Sec. 070), and any person discovering a significant spill must notify the County's Hazardous Materials Management Division within 24 hours.
Violations & Fines
A violation of Chapter 14.15 is a misdemeanor, though the City may instead charge it as an infraction at its discretion (Sec. 14.15.080). Penalties follow Chapter 1.12 of the Municipal Code, and the ordinance separately authorizes civil actions, cease and desist orders, stop work orders, and permit suspension or revocation for continuing violations. Each day a violation continues is treated as a separate offense, and violations are also declared a public nuisance subject to abatement.
Frequently Asked Questions
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Who enforces San Marcos stormwater rules?
What happens if I drain a swimming pool into the street?
Sources & Official References
Other rules in San Marcos
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