Drinking Water Well Monitoring

Water Quality Coalition

ILRP-Irrigated Lands Regulatory Program
Drinking Water Well Monitoring Program

​The Drinking Water Well Monitoring Program started in January 2022 in the Sac-Valley making the first drinking water well samples due by December 31, 2022. This program is administered by the Regional Water Quality Control Board. Landowners with parcels enrolled in the ILRP that have drinking water wells actively used for drinking and cooking have this requirement. The Regional Board send postcards reminding landowners to complete their well water sampling. Annual sampling may be required. Sampling is required based on results of the test.  See below. If you did not test the first go around, please do it now. Well owners that have three consecutive years with results of less than 8 mg/L can reduce the monitoring to every five years. You should received a letter from the Regional Board stating this when you are eligible.  

If you have any questions about this program, please contact the Regional Board at (916) 464-4611 or irrlands@waterboards.ca.gov

Drinking  Water Well Sampling Guidelines:

After three years of consecutive samples...

  • If all results are less than 8mg/L, sampling is reduced to every five years;  
  • If sample results are between 8mg/L - 10mg/L, continue to sample annually;
  • If the sample exceeds 10mg/L, notification is required to the user and Regional Board, then no further sampling is required.

(Safe drinking levels are 10mg/L or less, nitrate + nitrite as nitrogen.)

Pick up water sample bottle at the following locations:

  • Dixon/Solano RCD Water Quality Coalition
    • 1170 N. Lincoln Street, Suite 110
    • Dixon, CA 95620
    • (707) 678-1655 x103
    • Call before stopping by the office. 
  • Grow West Dixon
    • 8751 Pedrick Road
    • Dixon, CA 95620
    • (707) 678-5564
    • M-F 7am-4pm
  • Dellavalle Labs

Links to resources:

Geo Tracker Database TutorialList of Certified Environmental Laboratory Accreditation Program (ELAP) Labs ILRP-Drinking Water Well Member Information Form-revised, Member ID is no longer required on formNotification templateDWW Quick GuideDellavalle Laboratory Cost ListDellavalle Lab Fillable Water Work Request FormResidential Water Treatment Systems State Water Board's Approved List

The information about providers and services contained on this website does not constitute endorsement or recommendation by Dixon RCD and/or D/S RCD Water Quality Coalition and is presented only as a courtesy to our Coalition Members.