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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.

The comment period for the 100-J water quality general permit renewal closed on June 26, 2023. More information, which includes the notice and proposed permit, is provided below:


DEQ hosted information sessions starting in late January 2022 to let permit holders and other interested stakeholders know that the permit is being renewed, that renewal involves a review of current regulations and to expect significant changes since the permit was last issued in 1996.

A second information session was held to relay current temperature criteria and provide an overview of DEQ's temperature total maximum daily loads.
DEQ held additional information sessions in preparation for having a draft permit for public comment.


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