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
02035000 01632900 01656903 01638500 01646500 03524740 02079500 0205551614 0163287828 02054550 02054750 01668000 01673000 01646000 01674500 01654500 01654670 0164578734 01654000 01645704 02041650 01645762 01654107 01646305 01646305 0164579522 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.