Water Quality Management Plan

Urban runoff contains pollutants that adversely affect water quality in our local creeks, harm our aquatic habitats, and degrade our water supplies. Urbanization not only increases the concentration of existing pollutants in everyday runoff but also introduces new pollutants into our surrounding ecosystems. In addition, increased stormwater flows caused by urban sprawl cause erosion, hydromodification, and other environmental damages downstream.
In order to mitigate the effects of urbanization on water quality, and in accordance with State and Regional water quality mandates, the City of Temecula conditions all new developments and modifications to existing developments that add, create, extend or replace impervious surfaces, or that result in the disturbance of one acre or more of land, to implement project-wide Low Impact Development (LID) and hydromodification Best Management Practices (BMPs). By implementing BMPs, pollutants can be effectively removed from the project's post-construction runoff before reaching our local creeks.

Water Quality Management Plan (WQMP)
To meet this requirement, the Riverside County permittees in the Santa Margarita River watershed developed a WQMP.
Trees and Rocks in a Parking Lot for Stormwater Prevention
What is a WQMP?
  • A WQMP is a special engineering study that must be prepared by a Registered Civil Engineer during the project's entitlement phase and accepted by the City.
  • A WQMP identifies all project-related pollutants, impacts to the site's hydrologic condition, and potential impacts to our local creeks caused by the project's post-construction runoff.
  • A WQMP identifies the BMPs required to remove pollutants from the project's post-construction runoff and prevent downstream hydromodification.
  • A WQMP identifies the parties responsible for long-term operation and maintenance activities of all BMPs.
The WQMP contains step-by-step instructions and a project-specific template to design effective combinations of post-construction BMPs that meet local, state, and federal regulations.

NPDES Hotline
Report illegal discharges at 951-694-6411 during business hours, and at 800-506-2555 after business hours.
Only Rain in the Drain Illustration


Links for WQMPS Submitted Prior to July 11