Water Quality & Stormwater

The City of Temecula is committed to improving water quality by implementing programs that systematically reduce and eliminate pollutants from urban runoff before reaching our local creeks. These creeks historically receive untreated runoff from numerous storm drain systems throughout the city. Flows from each creek drain into the Santa Margarita River, which ultimately discharges into the Pacific Ocean. Urban runoff pollutants include:
  • Fertilizer
  • Grease
  • Oil
  • Paint
  • Pesticide
  • Pet waste
  • Sediment
  • Trash, etc.
Small Creek

Illegal Discharges

Discharges of any substance, including over-irrigation, resulting in runoff into the City street or storm drain system other than rainwater are prohibited by City ordinance 8.28.200 and are punishable by fines up to $1,000.00 per day per violation. Businesses and residents are encouraged to visit the RCWD Outdoor Water Use Efficiency website for tips to adjust irrigation and conserve water. Citizens are encouraged to report any observed illegal discharges to the City using the NPDES Hotline.


Only Rain in the Drain Illustration

NPDES Hotline


If you observe illegal discharges you may report them online, or call us at 951-694-6411 during business hours, and at 800-506-2555 after business hours.
EPA Regulations
To effectively address this issue, the City adopted EPA's National Pollution Discharge Elimination System (NPDES) regulations as part of the City's Water Quality Program and Sustainability Program to reduce pollutants in urban runoff and in storm water.
Plantlife Near a Creek
As part of the NPDES regulations, the City of Temecula was issued a Municipal Separate Storm Sewer System (MS4) Permit by the San Diego Regional Water Quality Control Board. This State Permit places pollution prevention requirements on planned developments, construction sites, commercial and industrial businesses, municipal facilities and activities, and residential communities.

Water Quality Program


The City's Water Quality Program includes, but is not limited to:
  • Assisting the development community in plan review so they comply with post-construction Water Quality Management Plan requirements
  • Conducting outreach and public education
  • Eliminating illegal discharges
  • Identifying pollutant sources
  • Inspecting businesses and construction sites
  • Monitoring water quality
  • Promoting Best Management Practices (BMPs)

References