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

USGS is updating how statistical information is delivered. WaterWatch and WaterQualityWatch will be retired around February 24, 2026. Explore alternative tools and share feedback at wdfn@usgs.gov.

Real-Time pH, field, in standard units

Map of , showing which states provide real-time computed water-quality data
11452500 11510700 11451800 11511990 11044000 11463980 11273400 11204100 11447650 381142122015801 11467000 11176900 10260500 11462500 11461500 10261500 11203580 11455095 11447890 11465240 11337190 11455340 11463682 11312676 11452800 11455485 10260950 11455142 11455315 11455385 380631122032201 11455338 390029122410601 09429490 11455140 11455276 11336790 11455136 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.