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2019 NPDES General Permits for Aquaculture Facilities in Idaho

Permittees: Because of COVID-19 response, access to the Region 10 EPA building is limited. Please use the new electronic tool (Central Data Exchange) for submitting Notices of Intent (NOIs) or updated NOIs. Please send any other permit-related notices (e.g., notice to transfer or terminate coverage) to Maria Lopez ( Please send compliance-related and enforcement-related notices or reports to Jason Rodriguez (

Below are EPA's 2019 National Pollutant Discharge Elimination System (NPDES) general permits and supporting documents for aquaculture facilities in Idaho (excluding facilities in the Upper Snake-Rock subbasin).

  • Permit numbers: IDG131000 & IDG133000
  • Effective date: December 1, 2019
  • Permits expire: November 30, 2024

Note: When these permits were reissued, EPA separated out discharges from aquaculture facilities located in Indian Country in Idaho under a separate general permit number (IDG133000) from the pre-existing permit number (IDG131000), which now covers only discharges to state waters. This change will facilitate the transfer of IDG131000 to Idaho in 2020 as part of the phased implementation of Idaho’s administration of the NPDES Program. EPA will remain the permitting authority for IDG133000.

For fish processors and facilities discharging within the Upper Snake-Rock subbasin, the 2007 NPDES General Permits for Aquaculture and Associated Fish Processing Facilities in the Upper Snake-Rock are still in effect.

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