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
09070500 09251000 07109500 06711565 09085160 09085000 09144250 09095500 09136100 09071750 09163500 391953108130201 07106000 09149500 09152500 393259107194801 09020500 09060799 400712108214601 394548108280501 09040500 09027100 06707525 09058000 09010500 09114500 09034250 06729470 09361500 09359020 09014050 09037500 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.