Seattle’s Denny Blaine Park was closed to swimming Wednesday after city inspectors detected high levels of fecal coliform bacteria in a stormwater pipe just upstream of the Lake Washington park.
The park will likely remain closed to swimming through the weekend until the lake water at the beach has been collected and tested and the area is declared safe for human contact, according to a news release.
The bacteria hasn’t been confirmed at the swimming beach, but tests are under way to verify the bacteria level in the lake.
The Seattle Parks and Recreation Illicit Discharge Detection and Elimination team has begun tracing the source of the bacterial contamination. Other utility workers will be setting up an emergency bypass system to divert flow from the stormwater drain and into a sanitary sewer line.
The high bacteria level was detected by the IDDE team during routine sampling of the city’s stormwater system.
The City of Bellevue reopened the swimming area at Meydenbauer Beach Park Wednesday after closing Tuesday afternoon because of high fecal bacteria levels in the water. The source of bacteria there remains unknown, but the sewer line was checked and no leaks were detected.