Changes in the new Industrial Stormwater General Permit

The new Industrial Stormwater General Permit became effective January 1, 2010. Changes to the permit include:

  • New Mandatory BMPs.
  • Benchmarks now trigger action for all parameters – no more Action Levels.
  • Copper benchmark has been reduced from 149 μg/L to 14 μg/L.
  • Level 2 and 3 corrective actions now triggered on an annual basis.
  • Numeric effluent limits now apply to facilities with discharges to 303(d) waterbodies. Some sites must commence fecal coliform sampling.
  • Monthly visual inspections now required.

Click here for the two page Ecology document outlining the changes.

Whatcom Environmental Services can help you make a smooth transition to the new permit by:

  • Helping you to understand and implement the changes
  • Updating your SWPPP to reflect all the new changes
  • Being a liaison to Ecology for questions you may have

Please call or e-mail us for a free consultation or with any questions you may have. Click on Contact at the bottom of this page.


Click here for Ecology’s Industrial Stormwater General Permit page.

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