New York Harbor Water Quality Results
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.

This map is a project of Open Sewer Atlas NYC through the support of NYC Soil & Water Conservation District and the generous volunteer technical assistance of Gus Rylander and SAVI class instruction of Eric Brelsford.
NYC Deptarment of Health's Water Quality Standards for Swimming

Acceptable: less than 35 colonies
Unacceptable if levels persist: 35-104 colonies
Unacceptable: more than 104 colonies

This is the estimated count of Enterococcus colonies for a 100 milliliter water sample. Their presence indicates possible fecal pollution.