Drinking Water Well Testing

The new requirement to test all drinking water wells for Nitrate + Nitrite as Nitrogen is going to be starting in the Sacramento Valley in January 2022. Coalition members or associated landowners with drinking water wells on enrolled parcels are required to sample. If your drinking water well is not on a enrolled parcel, you are not required to test. 

Drinking Water Well Testing Resources

Please see the below resources for testing your Drinking Water Wells.  We are recommending that members test their drinking water wells before the January 2022 date to see what their Nitrate + Nitrite as Nitrogen levels are.  If you test that you have Nitrate + Nitrate as Nitrogen in your drinking water, there is an option to start providing bottled water to the users of the well and you will not need to test and report your results to the state GeoTracker website. To use this option you will need to keep receipts proving that you are purchasing bottled water. 

There is more information in the Drinking Water Well Monitoring FAQ pdf below. 

You must use an ELAP certified laboratory if you want your testing results to count towards the required testing. Prices for the local ELAP certified laboratories can be found in the pricing pdf that can be found below. If you do not use a ELAP certified lab, your results cannot be uploaded into the GeoTracker website and you will need to obtain a new test. 

Sampling Frequency Requirements: 

Sampling frequency depends on the Nitrate + Nitrite concentration in the drinking water. The sum of Nitrate + Nitrite is: 

  1. Below 8mg/L: sample for three consecutive years. If Nitrate + Nitrite is below 8mg/L for all three years, then sample once every 5 years. 
  2. Between 8mg/L and 10mg/L: Sample every year. 
  3. Above 10mg/L: Notify the water user and no additional sampling is required. 

Local ELAP Certified Laboratories: 

The Yolo County Farm Bureau is no longer a drop off for water samples. However, you can obtain sample bottles while supplies last in our office and drop it off to one of the below laboratories. Please see pricing information for each of the below labs in the attached PDF files.  We recommend that you call our office for sampling bottle availability before coming in so that you do not waste time if we are out of bottles 530-662-6316. 

Dellavalle Laboratory, Inc.

502 Mace Blvd #2-B

Davis, CA 95618


Anteris Agronomics [Consulting Firm - Tests Using Denele Analytical]

40 N East St., Ste A & B 

Woodland, CA 95776


Denele Analytical

40 N East St., Ste A & B 

Woodland, CA 95776


PDF Files 

Sampling Guide - Dellavalle Laboratories, Inc. 
Drinking Well Monitoring FAQs
Pricing Guide for Local ELAP Labs
Yolo County Farm Bureau is a non-governmental, non-profit, voluntary membership, California corporation whose purpose is to protect and promote agricultural interests in Yolo County and to find solutions to problems of the farm, the farm home, and the rural community.
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