Nobody has been allowed to swim in the Anacostia River for 50 years, and that streak will continue for at least a couple more weeks as Washington D.C.’s inaugural Anacostia River Splash has been postponed due to E. Coli in the water.

The event was supposed to take place on Saturday, but Anacostia riverkeeper Trey Sherard said he received test results Saturday morning confirming what organizers called results “above E. coli recreational standards.”