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Water Quality

Testing Well Water

Residents can conduct annual water testing through the County. Water testing is an inexpensive and effective way of assuring a safe and healthy water supply.

Water testing is required when there is a property transaction that includes any wells. When there is a property transaction, Dakota County requires that water samples be collected by an independent third party (County personnel, agent of a certified lab or County designated person).

State and local health authorities recommend that private drinking water supplies are tested annually for total coliform bacteria and nitrate.  Well owners may also consider a pesticide screen and immunoassay screen to confirm pesticides and breakdown products of pesticides in a water sample.

Routine testing
Residents interested in routine testing can get water test kits in the following ways:

  • Pick up a water test kit at the Dakota County Extension Office, 4100 220th Street, Farmington.
  • Pick up a water test kit at the Dakota County Water Resources Department, Western Service Center, 14955 Galaxie Avenue, Apple Valley.
  • Request that a water test kit be mailed—call Dakota County at 952-891-7000 or  order a private water supply test kit


Cost of testing
The Dakota County Water Resources Department can perform tests for the following contaminants:

  • Coliform bacteria and nitrate – $32.00
  • Coliform bacteria – $18.00
  • Nitrate – $18.00
  • Pesticide screening  – $50.00*
  • Perfluorochemicals (PFCs) – $387.00 (includes sample collection)

A check or money order should be made payable to: Dakota County Property Taxation & Records Department. You may request that the County both collect the water sample. The County charges $80 for collecting a water sample, plus the cost of testing. Call 952-891-7000 for more information.

*For pesticide screening tests, Dakota County requires prepayment and checks only, payable to: Heidelberg College. A specific sample kit and procedure is required for the pesticide screening test.  Mail payment to Dakota County Water Resources Department, Western Service Center, 14955 Galaxie Avenue, Apple Valley, MN  55124.

Additional tests (fluoride, lead, etc.) are available upon request for an additional charge.

Testing for perfluorochemicals
To have your well water tested for perfluorochemicals, contact the Dakota County Water Resources Department at 952-891-7000 or email water@co.dakota.mn.us to schedule a water sample collection. The water sample must be collected by County personnel.

Collecting your own sample
Carefully follow the water sample collection instructions inside the test kit.

Water samples may be taken to any one of three drop-off locations. The samples should be delivered on or before the times listed for each location. Samples cannot be accepted if received after this time.

The following schedule is in effect each week except on holidays:

Wednesday - Western Service Center, Apple Valley
Water Resources Department (third floor)
14955 Galaxie Ave
Apple Valley, MN 55124
Delivery Deadline: Wednesdays, 11 a.m.

Tuesday - Dakota County Extension, Farmington
4100 220th Street West
Farmington, MN 55024
Delivery Deadline: Tuesdays, 10 a.m.

Tuesday – Northern Service Center, West St. Paul
Public Health Department
1 Mendota Rd W Ste 410
West St. Paul, MN 55118
Delivery Deadline: Tuesdays, 10 a.m.

Last updated: 3/4/2014 9:45 AM