Dixon/Solano RCD Water Quality Coalition conducts representative water quality monitoring on behalf of coalition members that includes regular sampling at the Ulatis Creek monitoring site and two groundwater sites (see map of monitoring sites below). Where water quality standards are exceeded, Management Plans are triggered. Water quality sampling is on a three-year cycle of assessment-core-core.  This mean on an assessment year, the monitoring schedule is nearly monthly testing and on a core year (non-assessment), the monitoring is on the month an exceedance occured from the prior year, if on a management plan.

On the Central Valley Regional Water Board website, ILRP coalition submittals of approved annual monitoring plans and water quality summaries can be accessed here.

Annual Monitoring Plans

For most documents, you will need to submit a request to received the document.

Water quality monitoring for the Sediment Toxicity Management Plan at Ulatis Creek/Brown Road is preformed in April and August each year.  

For questions about water quality monitoring in the DS subwatershed, contact the Program Coordinator at (707) 678-1655 ext.103.

Water Quality Monitoring Schedule

Ulatis Creek Monitoring Schedule_2025-2026_20260205.pdfUlatis Creek Monitoring Schedule 2025-2026_revised.pdf

 

Water Quality Monitoring Map

DS RCDWQC Monitoring Sites.jpgDS RCDWQC Monitoring Sites.pdf

 

• ​Trend Well 1 and 2
  • Groundwater monitoring sites
• Ulatis Creek at Brown Road-UCBRD
  • Representative monitoring site (Management Plan for sediment toxicity and water column).
• Prospect Slough-PSCLD
  • Integrative monitoring site that incorporates surrounding watersheds.
• ​Z-Drain
  • Special project monitoring site not in use a this time.