This map indicates 2013 bacteria monitoring results of Chicago beaches by the NRDC.
The EPA developed the Beach Action Value as a safety standard to make swimming advisory decisions.
Beaches with samples exceeding BAV by 1-10 percent are green. Samples exceeding BAV by 11-20 percent are yellow. Samples exceeding BAV by 21 percent and over are red. A white dot indicates a beach with no data provided.