The Washington State Department of Ecology (Ecology) is hosting an informal meeting on January 28, 2021 to discuss implementing the U.S. Environmental Protection Agency’s (EPA) new total maximum daily load (TMDL) for temperature in the Columbia and Lower Snake rivers. On 18 May 2020, EPA released a draft TMDL for water temperatures in these rivers, and it invited public comment on the TMDL between 21 May 2020 and 21 August 2020. Ecology must now develop a plan to implement this new TMDL. Ecology’s implementation plan will impact a host of industries, as summarized below, including hydropower facilities, agriculture, forestry, industrial and manufacturing operations, and municipal waste water treatment plants along the Columbia and Lower Snake rivers subject to Clean Water Act (CWA) National Pollutant Discharge Elimination System (NPDES) permits. We will be monitoring what actions Ecology will require to implement the TMDL and the potential impact it will have on the operations and activities of affected parties so we can provide clients with an informed assessment of what to expect and how to proceed