Dixon/Solano RCD
Water Quality Coalition
Drinking Water Well Sampling Guidelines:
After three years of consecutive samples...
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If all results are less than 8mg/L, sampling is reduced to every five years;
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If sample results are between 8mg/L - 10mg/L, continue to sample annually;
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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
502 Mace Blvd, Suite 2B
Davis, CA 95618
Contact Name: Octavio Zarate Rocha (559) 301-1129
o.zaraterocha@dellavallelab.com
M-W 8am-3pm
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 sent postcards in August of 2023 to remind landowners to complete their well water sampling. The second sample was due by December 31, 2023, and the 3rd due on December 31, 2024. If you did not test the first go around, please do it now. Well owners that have three consecutive years less than 8 mg/L deo their well, 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
Links to resources:
Regional Water Board-ILRP Website-Drinking Water Well Monitoring
ILRP-Drinking Water Well Monitoring FAQ-Frequently Asked Questions
List of Certified Environmental Laboratory Accreditation Program (ELAP) Labs
ILRP-Drinking Water Well Member Information Form-revised, Coalition Member ID is no longer required on form
Drinking Water Well Notification Template
Dellavalle Laboratory Cost List
Dellavalle Lab Fillable Water Work Request Form
Residential 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.