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
01310740 01304562 01372043 01304650 01304057 01303152 04213500 01311143 01304200 01427207 404028073384601 0135749950 04231600 0135980207 01433500 01427510 01376269 01302020 01518700 01359165 01376307 01376520 01355475 01342732 01354330 01374019 04236000 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.