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
11455276 11455315 11455136 381142122015801 11455142 11455095 11312676 11455485 11447890 11447650 11337190 11455508 11455385 11336790 374938122251801 11455140 380631122032201 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.