California Real-time Water Quality

California 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

Continuous Water-Quality Gage
Discontinued Continuous Water-Quality Gage
Station Name Station Identifier County Computation Period
Cache Slough at Ryer Island, CA 11455350 Solano Jul. 2008 to Jul. 2013
Cache Slough at South Liberty Island near Rio Vista, CA 11455315 Solano Dec. 2010 to Present
Colorado River Below Parker Dam, AZ-CA 09427520 San Bernardino Jan. 2014 to present
Georgiana Slough near Sacramento River, CA 11447903 Sacramento Oct. 2011 to Jan. 2015
Liberty Cut at Little Holland Tract near Courtland, CA 11455146 Yolo Jan. 2014 to Jan. 2019
Little Holland Tract at North Breach near Courtland, CA 11455143 Yolo Aug. 2014 to May. 2018
Little Potato Slough at Terminous, CA 11336790 San Joaquin Oct. 2012 to Jan. 2015
Middle River at Middle River, CA 11312676 San Joaquin Oct. 2010 to Sep. 2020
Miner Slough At Highway 84 Bridge, CA 11455165 Solano Jul. 2008 to May 2015
Prospect Slough at Toe Drain near Courtland, CA 11455167 Solano Oct. 2014 to May. 2018
Sacramento River Deep Water Ship Channel near Rio Vista, CA 11455335 Solano Aug. 2008 to May 2015
San Joaquin River at Jersey Point, CA 11337190 Contra Costa Oct. 2011 to Oct. 2014
San Joaquin River below Garwood Bridge at Stockton, CA 11304810 San Joaquin Oct. 2010 to Dec. 2014
Toe Drain at Mallard RD near Courtland, CA 11455139 Yolo Aug. 2014 to Dec. 2016