ALS Environmental - Newtown
Newtown
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Fuel and chemical compounds (organics)
- Radioactive elements (radiological)
- Uranium
Call to request a private well test kit and price.
Well water in Tolland County, CT: what to know and what to test for
Bottom line
About12,100people on private wells may have arsenic above the drinking water limit of 10 micrograms per liter (likely 8,700 to 16,700).
Among the higher estimated numbers of affected well users in Connecticut.
Indoor radon potential: Moderate
Connecticut recommends testing every private well for arsenic, uranium and radon at least once.
Find a certified labHow to read these numbers
USGS estimate based on 2010 population, published 2017.
Connecticut advises well owners to compare their results to this limit.
Larger counties have more well users, so higher counts don't mean any one well is more likely to be affected.
EPA zone for indoor air. It doesn't measure your well water.
What to test for
The Connecticut Department of Public Health recommends these tests for every private well.
| Test | How often |
|---|---|
| Basic indicators (bacteria, nitrate, pH, iron and other common measures) | Every year, and after any repair to your well, pump or pipes, or if your well head floods |
| Arsenic, uranium and radon in water | At least once, ideally every 5 years |
| Lead | At least once; also if you're planning a pregnancy or have a child under 6; every 3 to 5 years if your water is corrosive |
| Volatile organic compounds (VOCs: gasoline, oil, solvents) | At least once; more often if a problem is suspected |
| Fluoride | Every 5 years when a child under 12 lives in the home |
Questions about testing or treatment? Call the CT DPH Private Well Program at (860) 509-8401.
Where to test
No certified private-well labs are listed for Tolland County.
These labs elsewhere in Connecticut accept private-well samples.
Fairfield County
Greenwich Health Department Laboratory
Greenwich
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Radioactive elements (radiological)
Call to request a private well test kit and price.
Stamford Health Department Laboratory
Stamford
Certified for
- Bacteria
- Minerals and metals (inorganics)
Call to request a private well test kit and price.
Hartford County
Envirotech Laboratory
Windsor
Certified for
- Bacteria
- Minerals and metals (inorganics)
- Radioactive elements (radiological)
Call to request a private well test kit and price.
Northeast Laboratories, Inc
Rocky Hill
Certified for
- Bacteria
- Minerals and metals (inorganics)
Call to request a private well test kit and price.
Middlesex County
Eastern Analytical Laboratory, Inc.
Old Saybrook
Certified for
- Bacteria
- Minerals and metals (inorganics)
Call to request a private well test kit and price.
New Haven County
Aquatek Labs, Inc.
Woodbridge
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Fuel and chemical compounds (organics)
- Radioactive elements (radiological)
- Uranium
Call to request a private well test kit and price.
Environmental Consulting Lab
Madison
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Uranium
Call to request a private well test kit and price.
EMSL Analytical, Inc. - CT
Meriden
Certified for
- Asbestos
- Bacteria
Call to request a private well test kit and price.
Environmental Monitoring Lab
Wallingford
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Fuel and chemical compounds (organics)
Call to request a private well test kit and price.
Northwest Environmental Water Labs
Waterbury
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
Call to request a private well test kit and price.
Regional Water Authority
New Haven
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Fuel and chemical compounds (organics)
- PFAS
Call to request a private well test kit and price.
Windham County
Microbac Laboratories, INC. - Dayville
Dayville
Certified for
- Arsenic
- Bacteria
- Minerals and metals (inorganics)
- Fuel and chemical compounds (organics)
- Uranium
Call to request a private well test kit and price.
These are the test groups marked yes for that lab. A yes means the lab is certified for some or all of the tests in that group.
Lab list current as of October 9, 2026, from the Connecticut Department of Public Health.