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Assessment of Stormwater Runoff, MS4

2018 Industrial Storm Water General Permit Amendment

The California statewide National Pollutant Discharge Elimination System (NPDES) Industrial Storm Water General Permit regulates the discharge of water associated with industrial activity.  On November 6, 2018 the State Water Board amended the General Permit to new requirements. These additional requirements become effective on July 1, 2020.

The amendments include:

  • Sufficiently Sensitive Test Methods – requiring a site pollutant source assessment for applicable Total Maximum Daily Loads (TMDL)
  • TMDL Implementation – including requirements for facility operators to collect industrial storm water samples for pollutant analysis and assessed for compliance
  • Additional State options incentivizing on-site or regional storm water capture and use

EEC Environmental specializes in the analysis, evaluation, communication and remediation of storm water runoff. 

In light of these amendments, EEC is available for related services including:

  • Conducting a site pollutant source assessment for applicable TMDLs.
  • Reviewing previous sample results to determine if the current BMPs implemented are adequate for meeting the TMDLs
  • Recommending additional BMPs both general and advanced that can help to meet the TMDL
  • Assist in responding to any enforcement actions taken by the Regional Water Quality Control Board.

The complete Amendment Fact Sheet is available as a download here. 

Contact EEC Environmental for storm water site support.

best management practices, BMP, NPDES, storm water permitting, TMDL