The watershed serving Summit County is 18 percent cleaner than it was at the turn of the century, according to a report released by the Environmental Protection Agency.

Much of the historical contamination came from storm water runoff that carried pollutants such as oil, salts, sediments, fertilizers and pesticides into the water shed, according to a press release from Park City. In 2000, nearly 50 percent of the total phosphorous load in the water came from the city.

The improvement can be attributed to a storm water management plan that went into affect in 2002, said Park City Environmental Coordinator Jeff Schoenbacher. The plan included education for contractors and the public and applied new rules for sediment detention basins. For a draft copy of the EPA report, visit eastcanyoncreek.org