LW
Laconia Water Works Laboratory
117 Stark St, Lakeport, NH
Public water system lab. Many don't accept private well samples, so call first.
Water testing in New Hampshire
16 certified labs for drinking and well water testing in New Hampshire, from the official list, plus mail-in labs certified in New Hampshire, typical costs and what to test for.
9 cities & counties16 certified labs
Source: New Hampshire DES accredited laboratory search (NHELAP), drinking water, list dated Oct 29, 2026. Find a Water Test is independent and not affiliated with the New Hampshire Department of Environmental Services. Certification covers specific tests, so confirm the lab is certified for the ones you need: Verify a certification.
16Certified labs in New Hampshire on our list
8Counties with a listed lab
0Labs certified for bacteria (coliform)
1Mail-in labs certified in New Hampshire
Major cities
Counties in New Hampshire A–Z
Smaller counties in New Hampshire
Counties with only a few listings so far, grouped by county.
Belknap County 1
Coos County 1
GW
Gorham Wastewater Treatment Facility Laboratory
8 Main St, Gorham, NH
Public water system lab. Many don't accept private well samples, so call first.
Grafton County 1
EI
Endyne Inc
56 Etna Road, Lebanon, NH
Strafford County 1
SA
Seacoast Analytical Services LLC
72 Pinkham Rd, Lee, NH
Mail-in labs that ship to New Hampshire
How mail-in testing worksNT
National Testing Laboratories (WaterCheck)
Ships nationwide
Single tests from $75; well and city packages $165 to $440
Certified in New Hampshire
TS
Tap Score by SimpleLab
Ships nationwide
About $189 to $1,125 (city and well kits, Oct 2026)
Testing service: sends your sample to a partner lab.
How to get your water tested in New Hampshire
- Pick a certified lab. In New Hampshire, drinking water labs are certified by the New Hampshire Department of Environmental Services.
- Choose your tests. For a private well, the EPA recommends testing every year for total coliform bacteria, nitrates, total dissolved solids and pH. Add local concerns like arsenic, lead or PFAS.
- Get the lab's bottles. Use the lab's sterile bottles and follow its instructions exactly. Bacteria samples usually have to reach the lab within about a day.
- Check the results against EPA limits with our results checker, and retest after any repair or treatment.
Lab list from the New Hampshire Department of Environmental Services, current as of 2026-10-29.
Certifying agencies: State programs that certify labs to conduct drinking water analyses (US EPA).
What water testing costs in New Hampshire
Prices vary by lab. These are one state lab's published fees, so you have a benchmark when you call around. See the full cost guide.
Bad result? Get help from water treatment pros near New Hampshire
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.
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Just need a lab? Every certified lab is listed above with directions.
Common questions
Where can I get my water tested in New Hampshire?
There are 16 certified labs in New Hampshire on our list, drawn from the state's official list. 1 mail-in lab is also certified in New Hampshire. Labs are certified by the New Hampshire Department of Environmental Services, so confirm the lab is certified for the specific tests you need.
How much does well water testing cost in New Hampshire?
A basic bacteria test costs about $35 at a state public health lab, and bacteria plus nitrate about $70. Full homeowner packages run a few hundred dollars. Call two or three labs for current prices.
How often should I test my well in New Hampshire?
The EPA recommends testing a private well every year for total coliform bacteria, nitrates, total dissolved solids and pH, and right away after flooding, well repairs, or a change in taste, color or smell.
Is a mail-in kit as good as a local lab?
If the lab analyzing it is certified in your state for those tests, yes. For a home sale, check whether your lender requires the sample to be collected by the lab or an inspector.