Thursday, July 19, 2012

No Exposure Certification Under Proposed California General Permit

Phase II of the Federal stormwater rules changed the requirement for “no exposure certification” or NEC which existed in 1997, then the current California general permit was finalized. EPA extended the option to certify no exposure to any industrial sector. The draft IGP applies US EPA’s Phase II rules regarding a conditional exclusion for facilities where there is no exposure of industrial activities and materials to storm water. The previous California permit mandated that light industries obtain coverage only if their activities were exposed to storm water. This General Permit meets US EPA rules allowing any type of industry to claim the conditional exclusion.

In the draft IGP, the NEC requires enrollment for coverage but conditionally excludes dischargers from a majority of the permit requirements. Some minor modifications were added to clarify the types of “storm resistant shelters” and the periods when “temporary shelters” may be used to meet the NEC requirements. Under the draft ICP, dischargers meeting all the NEC would need to recertify each year.

Facilities that self-certified no exposure under the previous permit (category 11) are required to designate a Legally Responsible Person (LRP) to certify and submit via SMARTS for NOI or NEC coverage under this General Permit. NEC will need to be recertified through SMARTS on an annual basis.

Click here for a summary of the Draft California Industrial Storm Water Permit

Caltha LLP provides expert consulting services to public and private sector clients nationwide to address Stormwater Permitting and Regulatory Support, Stormwater Pollution Prevention Plans (SWPPP), Stormwater Monitoring and Stormwater Training.

For further information contact Caltha LLP at or Caltha LLP Website

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