Stormwater Discharges from Construction Activities

Stormwater runoff from construction activities can impact water quality. As stormwater flows over construction sites, it picks up pollutants, debris and chemicals. These untreated contaminants are transported to our rivers, creeks, sloughs and eventually to the Delta. Polluted runoff can harm or kill fish and other wildlife, destroy aquatic habitat, or erode stream banks.


The National Pollutant Discharge Elimination System (NPDES) stormwater program requires construction site operators engaged in clearing, grading and excavating activities that disturb one or more acres – including smaller sites in a larger common plan of development or sale – obtain coverage under an NPDES permit for their stormwater discharges.


Stormwater Discharges from Industrial Facilities

Likewise, industrial activities at industrial facilities are often exposed to the weather and generate runoff with residual pollutants from the industrial site. This runoff is transported to our open waterways.


To minimize the impact of stormwater discharges from industrial facilities, the NPDES program includes:

  • an industrial stormwater permits for 10 categories of industrial activity
  • that require authorization under an NPDES industrial stormwater permit for stormwater discharges.


Industrial and Commercial businesses within the City can request a Stormwater Pollution Prevention Evaluation to learn how to reduce or eliminate stormwater pollution. Commercial inspection fees are listed in the Fee Schedule. The Inspection Report forms listed below will show what inspectors look for during the inspection.


For more on construction or industrial facilities inspections, contact our Stormwater Program Coordinator.


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This City of Stockton web page last reviewed on --- 4/17/2019