NE
Northwest Environmental Water Labs
Oakville, CT
State-certified water testing labs in Connecticut
17 state-accredited labs for drinking and well water testing in Connecticut.
4 cities & counties17 certified labs
Source: Connecticut DPH list of in-state labs certified to test drinking water, list dated Jul 2, 2026. Find a Water Test is independent and not affiliated with the Connecticut Department of Public Health. Certification covers specific tests, so confirm the lab is certified for the ones you need:.
Major cities
Counties in Connecticut A–Z
Smaller counties in Connecticut
Counties with only a few listings so far, grouped by county.
Litchfield County 1
Middlesex County 1
EA
Eastern Analytical Laboratory, Inc.
Old Saybrook, CT
Windham County 1
ML
Microbac Laboratories, Inc. - Dayville
Dayville, CT
Mail-in labs that ship to Connecticut
How mail-in testing worksNT
National Testing Laboratories (WaterCheck)
Ships nationwide
Single tests from $75; well and city packages $165 to $440
Certified in Connecticut
TS
Tap Score by SimpleLab
Ships nationwide
Single-contaminant kits from about $145; full well and city panels about $300 to $870
Testing service: sends your sample to a partner lab.
Bad result? Get help from water treatment pros near Connecticut
Tell us what your test found and we'll connect you with up to three local water treatment companies.
What happens next
- We match your ZIP to water treatment companies nearby.
- They contact you directly to talk through your results.
- Compare options and pick one, or none. No fee, no obligation.
Free, no obligation. We don't sell your details to anyone else.
Just need a lab? Every certified lab is listed above with directions.