Centennial, CO Environmental Rules: Stormwater Management (2026)
Key Facts
- Governing section
- City Code § 13-1-210
- Minimum fine
- $500 per violation
- Intentional violation fine
- $1,000 minimum
- Enforcement
- City and SEMSWA inspections
Summary
Centennial bans discharging pollutants into the storm drain system or watercourses, with limited exemptions for clean water sources like irrigation runoff and air conditioning condensation.
It shall be unlawful to discharge, cause to be discharged or permit to be discharged into the MS4 or watercourses any direct or indirect release of pollutants to the storm drainage system, except as specifically exempted in Subsection 13-1-210(b) below. Discharges may not result in a noncompliance with the Permit.
Full Breakdown
City Code Section 13-1-210 makes it unlawful to discharge, cause, or permit any pollutant into the MS4 or watercourses unless specifically exempted. Exempt discharges include water line flushing, landscape irrigation, foundation drains, air conditioning condensation, dechlorinated pool water, and firefighting water, when they don't violate the City's NPDES permit. SEMSWA and the City enforce compliance and can inspect property to check for illicit discharges.
Violations & Fines
Prosecutable violation; minimum penalty $500 per offense, rising to at least $1,000 if the court finds the violation intentional. Each calendar day of violation is a separate offense.
Frequently Asked Questions
Can I wash my car in the driveway in Centennial?
What counts as an illicit discharge in Centennial?
Sources & Official References
Other rules in Centennial
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Stormwater Management in Nearby Cities
How other cities in Arapahoe County handle stormwater management.