Orange County, CA Environmental Rules: Stormwater Management (2026)
Key Facts
- Governing law
- Water Quality Ordinance, Div. 4-13
- Key ban
- Illicit connections & prohibited discharges
- Intent standard
- Violation applies regardless of intent
- Nonconforming grace period
- 5 yrs structural / 6 mo after notice
- Nuisance authority
- Gov't Code Sec. 38771 abatement
- Infraction fines
- $100 / $200 / $500 tiers
- Misdemeanor penalty
- Up to $1,000 or 6 months jail
Summary
Orange County's Water Quality Ordinance bars anyone in the unincorporated area from creating an illicit connection to the stormwater drainage system or causing a prohibited discharge into it, including excess irrigation runoff that carries pollutants. Section 4-13-40 applies regardless of intent, and OC Public Works can order cleanup, seek a nuisance abatement, or refer the case for criminal prosecution.
(a)No person shall:(1)Construct, maintain, operate and/or utilize any illicit connection.(2)Cause, allow or facilitate any prohibited discharge.(3)Act, cause, permit or suffer any agent, employee, or independent contractor, to construct, maintain, operate or utilize any illicit connection, or cause, allow or facilitate any prohibited discharge.(4)Irrigate their property in a manner that causes excessive runoff into the stormwater drainage system, resulting in unnatural flows, or transports pollutants to a receiving water as so defined by the NPDES permit... (c)A civil or administrative violation of section 4-13-40(a) shall occur irrespective of the negligence or intent of the violator to construct, maintain, operate or utilize an illicit connection or to cause, allow or facilitate any prohibited discharge.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 157).
Full Breakdown
Section 4-13-40 of the County's Water Quality Ordinance, Title 4, Division 13, prohibits four things: constructing, maintaining, operating or using any illicit connection; causing, allowing or facilitating a prohibited discharge; directing an agent, employee or contractor to do either; and irrigating property in a way that causes excessive runoff into the stormwater system, producing unnatural flows or carrying pollutants to a receiving water as the NPDES permit defines it. The prohibition reaches connections that predate the ordinance, though a legal nonconforming connection gets a grace period, five years for structural improvements or six months after the County gives notice for nonstructural ones, and the Director of OC Public Works can grant a reasonable extension based on the risk to receiving waters, the discharger's investment, and the financial hit from shutting it down.
Subsection (c) makes clear a violation occurs irrespective of the negligence or intent of the violator, so a connection or discharge does not need to be deliberate to violate the section. 5. New development and significant redevelopment projects must also follow the County's Drainage Area Management Plan under Section 4-13-50 before OC Public Works will issue a grading, building, or nonresidential plumbing permit.
Violations & Fines
Section 4-13-72 lets the County's Enforcing Attorney charge a violation as an infraction, punishable by a fine of up to $100 for a first offense, $200 for a second within a year, and up to $500 for each additional violation, or prosecute it as a misdemeanor, punishable by up to $1,000 and up to six months in jail, for anyone who negligently or knowingly violates the division, conceals a violation, or lets one continue after notice. Section 4-13-73 makes each day of a violation a separate offense.
Frequently Asked Questions
What counts as an illicit connection to the stormwater system in unincorporated Orange County?
Can I be cited even if I didn't mean to cause a discharge?
What happens if OC Public Works finds a violation on my property?
What are the criminal penalties for a stormwater violation?
Sources & Official References
Other rules in Orange County
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