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100-J General NPDES Permit

100-J Water Quality General Permit is a statewide NPDES general permit for minor sources. This is a permit for industrial sources that discharge no more than 0.5 MGD of non-contact cooling water, defrost water, heat pump transfer water, and cooling tower blowdown. Also included are cooling and sump water discharges from hydroelectric facilities.

DEQ is working to update the 100-J Water quality General Permit that was issued in 1996.

Information sessions

DEQ hosted an information session in late January 2022 to let permit holders and other interested stakeholders know that the permit was going to be renewed, that renewal involved a review of current regulations and to expect significant changes since the permit was last issued 20 years ago. A second information session was held in September 2022 to relay current temperature criteria and provide an overview of DEQ's temperature total maximum daily loads.

More recently, DEQ held smaller more focused information sessions at the end of January 2023 in preparation for having a draft permit for public comment.

A release of a draft 100J for public comment is expected in April 2023.


For more information about these presentations, or about the permit renewal in general, please contact Beth Moore, General Permits Coordinator.