Big Doctor is a 213-acre seepage lake in Siren Wisconsin. For decades, the lake has been an idyllic, sandy bottom recreation spot for fishing, boating and swimming by people using the State owned public boat landing and the fortunate few who own property on the lake. Between 2000-2010, lake residents began to notice an increase in aquatic plant growth and algae blooms that impeded recreation. The Big Doctor Lake Association (BDLA) partnered with Burnett County and the DNR staff on an Aquatic Plant Management Plan. Participants learned that excessive phosphorus was the primary cause of these problems. Further study revealed the primary source of elevated phosphorous pollution was the Village of Sirens waste water treatment facility one mile to the south. The BDLA considered league action for the pollution which was causing explosive plant growth and algae, including recent Cyanobacteria blooms. However, the BDLA pursued a collaborative partnership with various government entities to correct the problem. Presentation will summarize collaborative effort, results to date, next steps.