This map shows water quality results for Enterococcus, a sewage-indicating bacteria. Results are from NYC Department of Environmental Protection Harbor Survey and NYC Water Trail Association , a group of citizen scientists. DEP tests 90 sites monthly from November to April, and weekly from May to October. NYCWTA tests around 50 sites weekly from May to October.
Use the slider in the precipation chart to see weekly water quality results and the dropdown menu to change years. Precipitation data come from NOAA's JFK weather station.