Water Data Portal

About Our Monitoring Program

The mission of the District’s Water Resources Monitoring program is to provide quality-assured water data for use in research, planning, public safety, recreation, and education. The District is committed to documenting our hydrologic conditions for present and future stewards of the unique water resources in our community.

Hydrologic Conditions Reports

These monthly reports compare current conditions to historic data.

Most Recent Report | Past Reports

Rivers

Lakes

Springs

Groundwater

Rainfall

Water Quality Data

Water quality data helps determine the health of our groundwater, springs, rivers, and estuaries.  The link below will lead you to the map of active water quality monitoring stations, as well as it contains links for downloading water quality data for individual active stations and for downloading all historical water quality data.  

Additional District Data Available by Request

Please contact the Water Resources Department Data Manager for more information about data available.  

In additional to water level and water quality data, additional data sets may be available for select locations.  For example:

  • Doppler Radar daily rainfall estimates on a number of scales, from county-wide down to a 2-kilometer area. Data can be provided in maps or tables. Records begin in February 2001.
  • Biological data including algae and aquatic invertebrates on major rivers and streams. Records begin in 1989.
  • Groundwater data (levels and/or quality) for over 800 inactive stations.
  • Hourly data for a number of groundwater and surface water sites.

Important Change in River Level Measurements

In August 2016, the District began the use of a new vertical datum, the North American Vertical Datum of 1988 (NAVD88). In the past, the District has used the National Geodetic Vertical Datum of 1929 (NGVD29). The new datum resulted in a downward shift of between 0.64 to 0.90 feet depending on location. There is no change in the actual river level, only the value used to represent the level is different. 

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