The Stormwater Utility Division operates and maintains 620 miles of pipe, 72 pump stations, and over 100 discharge pipes that collect and route runoff from the streets and gutters to our local rivers, creeks, and sloughs. The Stormwater Divison also manages the City’s National Pollutant Discharge Elimination Permit (NPDES) and all monitoring, testing, education, and programs required under the permit.
The NPDES Stormwater Program regulates stormwater discharges from three potential sources:
Stormwater runoff occurs when precipitation from rain and snow melts does not absorb into the ground. As the runoff flows over the land or impervious surfaces (paved streets, parking lots, and rooftops), it accumulates debris, chemicals, and other pollutants that could adversely affect water quality.
Stockton’s stormwater is collected in catch basins and transported, untreated, directly into our local rivers, creeks, and sloughs, and eventually to the Delta. Best management practices (BMPs) is the primary method to stop contaminants from entering the system.
Municipal Separate Storm Sewer System (MS4) permits are required under the Clean Water Act and require the discharger to develop and implement a Storm Water Management Plan to reduce the discharge of pollutants to the Maximum Extent Practicable (MEP). The management plans specify what BMPs will be used to address certain program areas: such as public education and outreach, illicit discharge detection and elimination, construction and post-construction, and good housekeeping for municipal operations.
Each year the City is required to provide an Annual Report to the State on their Stormwater Program and BMPs.
Operators of construction sites on one-acre or larger, including smaller sites part of a larger common plan of development, are monitored under the State’s Construction General Permit. The Stormwater Program also requires specific control measures for post-construction runoff from new developments and redeveloped areas.
The Stormwater Quality Control Criteria Plan (SWQCCP) provides development standards on these controls, including general site control measures, site-specific source control measures, and treatment control measures for the following:
Retail gas outlets with 5,000 or more sq. ft. of impervious area
Overview of Federal, State and local stormwater regulations:
Description of various BMPS that may be implemented on construction sites:
The Stormwater Program works with local industries to prevent stormwater pollution using:
Industrial companies may require authorization under an NPDES industrial stormwater permit for stormwater discharges.
Other related documents available:
This City of Stockton web page last reviewed on --- 8/29/2017