WaterQualityWatch -- Continuous Real-Time Water Quality of Surface Water in the United States

Real-Time Chlorophyll, in µg/l

Map of , showing which states provide real-time computed water-quality data
05549500 05586300 05558300 03378500 05553700 05543010 05538010 05537980 05568705 05559900 423784088133401 Explanation

* Site operated on a seasonal basis or currently is not operating.
No values are available for the last 6 hours.

The "Real-time" map tracks short-term changes (over several hours) of water quality. Although the general appearance of the map changes very little from one hour to the next, individual sites may change rapidly in response to major rain events or to reservoir releases. The data used to produce this map are provisional.