Virginia Real-Time Water Quality
Real-time computed concentrations of water-quality constituents such as suspended sediment, total nitrogen, and total phosphorus are calculated using ordinary least squares regression models. The results of these models, along with direct water-quality measurements, can be viewed here as time-series graphs, or downloaded as tabular data.
Ordinary least squares regression models on this site use conventional sensor measurements (for example, discharge, temperature, pH, specific conductance, turbidity, and dissolved oxygen) to compute concentrations and loads of other water-quality constituents in real time. This makes it possible to compute instantaneous values of many constituents in real time for public safety without the lengthy time delay of collecting a sample and waiting for analysis of a sample at a laboratory.
Please select a site from below to start viewing data. You also can read more about the methods, measured constituents, and disclaimers by using the navigation bar at the top of each page.
Map Legend
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Continuous Water-Quality Gage |
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Discontinued Continuous Water-Quality Gage |
| Station Name | Station Identifier | County | Computation Period |
|---|---|---|---|
| Accotink Creek Near Annandale, VA | 01654000 | Fairfax | Jan 2014 to present |
| Clinch River at Route 65 at Dungannan, VA | 03524740 | Scott | Jan 2009 to present |
| Dead Run at Whann Avenue Near Mclean, VA | 01646305 | Fairfax | Jan 2007 to present |
| Difficult Run Above Fox Lake Near Fairfax, VA | 01645704 | Fairfax | Jan 2007 to present |
| Difficult Run Near Great Falls, VA | 01646000 | Fairfax | Jan 2012 to present |
| Flatlick Branch Above Frog Branch at Chantilly, VA | 01656903 | Fairfax | Jan 2007 to present |
| James River at Cartersville, VA | 02035000 | Goochland | Jan. 2003 to present |
| Lick Run Above Patton Avenue at Roanoke, VA | 0205551460 | Roanoke City | Jan. 2019 to present |
| Pamunkey River Near Hanover, VA | 01673000 | Hanover | Jan 2007 to present |
| S F Little Difficult Run Above Mouth NR Vienna, VA | 01645762 | Fairfax | Jan 2007 to present |
| Smith Creek Near New Market, VA | 01632900 | Shenandoah | Jan 2010 to present |