The Clean Water Act provides for discharges into waters of the United States, provided these discharges are in compliance with the National Pollutant Discharge Elimination System (NPDES) permit requirements. Pursuant to the Clean Water Act, the City of Gilroy as a small municipality (population below 100,000) with a municipal separate storm system, is classified as a MS4 and is operating under a NPDES permit for this classification.
The State Water Resources Control Board (SWRCB) governs and regulates the State’s NPDES permitting program. The SWRCB is comprised of nine Region Water Quality Control Boards. The City of Gilroy is under the jurisdiction of the Central Coast Regional Water Quality Control Board (CCRWQCB). In February 2010 the City of Gilroy along with Morgan Hill and San Martin received their approved NPDES General Permit for a small municipal storm water system. Under this permit the City is required to implement a Storm Water Management Program (SWMP) to prevent the pollution in storm water and urban runoff from entering the storm drain system, protecting the water quality of creeks, streams in the Pajaro River and Monterey Bay watershed. The Storm Water Program is a Regional Plan to be carried out in all 3 jurisdictions.
The six target areas identified in the SWMP to improve storm water quality are:
Public Involvement and Participation
Illicit Discharge Detection and Elimination
Construction Site Storm Water Runoff Control
Post Construction Storm Water Management in New Development/Redevelopment
Pollution Prevention/Good Housekeeping for Municipal Operations