Related Program: Idaho Matters Many Of Idaho's Sewage Treatment Plants Get A Failing Grade By Samantha Wright • Jul 1, 2019 Related Program: Idaho Matters ShareTweetEmail Idaho Conservation League Listen Listening... / 13:05 A lot of sewage treatment plants in Idaho got a failing grade in the latest Idaho Conservation League study. Gemma Gaudette talks to the League about why they scored so low and how the ICL wants to help change that trend. Tags: SewageWastewaterIdaho Conservation LeagueEnvironmentShareTweetEmailView the discussion thread. Related Content Raw Sewage Leaked Into Northern Idaho Lake By Associated Press • Apr 6, 2017 Eustacia B / Flickr Creative Commons Officials in northern Idaho say thousands of gallons of raw sewage seeped into Hayden Lake. KREM-TV reports that the Hayden Lake Recreational Water and Sewer District was notified Wednesday of the sewage spill. The sewage seeped up from the ground due to a faulty sewer service connection. District representatives estimate that 3,500 to 17,000 gallons of sewage was released into the lake. The lake has since been disinfected with sodium hypochlorite and does not pose a known threat to the public.