Stormwater Discharge Permits


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In California specific industries are required to obtain a Stormwater Discharge Permit for normal storm water run off from the site.

The intent of the regulation is to reduce the impact of accidental discharges and hazardous material residuals being washed into the storm drain by stormwater run off, where it goes directly to waterways untreated. Many companies mistakenly assume that if they are not discharging any industrial wastewater into the storm drain, this regulation does not apply to them. This is not the case. Unauthorized industrial wastewater discharge to storm drains is prohibited in all cases. This regulation focuses on unintentional discharge that most companies have the potential for, including spills (i.e. during loading and unloading), residue from emissions settling on the roof and local area, outside operations or storage that may contribute to stormwater washing residues into the storm drains.

Regulated facilities are required to:

  • Submit an Initial Notification of Intent (NOI)
  • Develop a Stormwater Pollution Prevention Plan
  • Develop a Stormwater Monitoring Plan
  • Conduct regular visual observations and collect stormwater samples
  • Prepare an Annual Report of observation and sampling results

CDMS prepares the Notification of Intent (NOI), the Pollution Prevention Plan, Monitoring Program, and the Annual Stormwater Report required to comply with this permit. Contact CDMS for more information.

Stormwater Sampling Kits

CDMS provides stormwater sampling kits to make stormwater sampling easier.  Kits are provided to clients before the rainy season starts, including the appropriate type and number of sampling media. The kits are then simply shipped from the site to the laboratory for analysis of the samples. CDMS provides analysis reports for use in the Annual Stormwater Report.

Stormwater Annual Reports

CDMS prepares Annual Stormwater Reports for facilities to meet annual Reporting requirements. Reports are due July 1 every year.

Form information on how this regulation effects your facility, assistance in developing required programs or preparing reports, or to order Sampling kits, contact CDMS.