Irrigated Lands Regulatory Program -
Surface Water Quality Data

Surface Water Quality Data

This webpage serves to provide public access to the surface water quality monitoring data collected under the Irrigated Lands Regulatory Program. Data are submitted to ILRP by participating third-parties and then processed by the ILRP Data Management Team (DMT) before becoming publicly available in an electronic format.


Surface water quality monitoring data collected under the ILRP are available on the California Data Exchange Network (CEDEN). The CEDEN table below details what data are currently available. The availability of the most recently submitted data is subject to data submission schedules, processing, review and upload of the data by the ILRP Data Management Team (DMT). The DMT strives to make data available to CEDEN and the public as quickly as possible.

California Environmental Data Exchange

Click graphic to travel to the CEDEN website ( Select "Irrigated Lands Regulatory Program" under the "Select Programs" drop-down menu.

Coalition Project Available Date Range
East San Joaquin Water Quality Coalition Jul-31-2004 to Oct-14-2020
San Joaquin & Delta Water Quality Coalition Aug-24-2004 to Sep-16-2020
Sacramento Valley Water Quality Coalition Jul-12-2004 to Sep-23-2021
Westside San Joaquin Water Quality Coalition Sep-08-2008 to Feb-09-2021
Westlands Storm Water Coalition Jan-03-2005 to Apr-07-2020
Grasslands Bypass Project Oct-01-1995 to Dec-31-2020
Buena Vista Coalition Apr-30-2013 to Sep-21-2017
California Rice Commission Jul-27-2004 to Aug-05-2018
Cawelo Water District Apr-01-2014 to May-06-2020
Kern River Watershed Coalition Authority Jan-02-2014 to Mar-12-2021
Kaweah Basin Water Quality Association Jan-26-2014 to Jul-06-2021
Kings River Watershed Coalition Authority Jan-20-2014 to Sep-21-2021
Tule Basin Water Quality Coalition Jan-17-2014 to Aug-13-2020
Southern San Joaquin Water Quality Coalition Jul-06-2004 to Dec-09-2013 (complete)
Goose Lake Coalition May-15-2007 to Jul-13-2012 (complete)
Modesto Irrigation District Jul-06-2004 to Jan-25-2009 (complete)
Merced Irrigation District Jul-12-2004 to Sep-16-2008 (complete)
Turlock Irrigation District Jul-14-2004 to Jul-23-2008 (complete)
San Luis Water District Mar-17-2006 to Feb-28-2007 (complete)
Oakdale Irrigation District Jun-23-2004 to Oct-06-2008 (complete)
Ag Waiver RWQCB5 (UCD Phase I & II Study) Mar-26-2003 to Nov-29-2007 (complete)
Last Transfer Date: 5/1/2021

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Central Valley
Regional Water Quality Control Board
Irrigated Lands Regulatory Program