privatewelldata / States / New Hampshire
New Hampshire well water testing
8 labs are listed on New Hampshire’s official certified-lab list; 14% of 863 sampled wells were above the arsenic limit across 10 counties. Updated 2026-10-18.
Official lab list for New Hampshire
Coverage map
Where the labs are
| Town | Labs |
|---|---|
| Concord | 2 |
| Kennebunk | 1 |
| Lebanon | 1 |
| Lee | 1 |
| Manchester | 1 |
| Portsmouth | 1 |
| Swanzey | 1 |
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Well water results by county
| County | Arsenic > 10 µg/L | Nitrate > 10 mg/L |
|---|---|---|
| Belknap County | 0% of 31 | 0% of 166 |
| Carroll County | 1% of 72 | 0% of 221 |
| Cheshire County | 6% of 18 | 2% of 60 |
| Coos County | 0% of 40 | 0% of 161 |
| Grafton County | 2% of 62 | 0% of 234 |
| Hillsborough County | 20% of 211 | 0% of 187 |
| Merrimack County | 28% of 163 | 0% of 436 |
| Rockingham County | 17% of 167 | 2% of 119 |
| Strafford County | 6% of 68 | 2% of 60 |
| Sullivan County | 3% of 31 | 0% of 41 |
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Nitrate: 0% of 1,685 sampled wells statewide. All New Hampshire counties →
Labs on the New Hampshire DES list
- Eurofins Environmental Testing Eastern Analytical, ConcordListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- NHDHHS Public Health Laboratories, ConcordListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Nelson Analytical Maine, KennebunkListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Endyne Inc., LebanonListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Seacoast Analytical Services LLC, LeeListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Nelson Analytical LLC, ManchesterListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Eurofins Portsmouth, PortsmouthListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
- Nelson Analytical Keene, SwanzeyListed in New Hampshire DES’s certified lab list. See the official list → (checked 2026-10-17)
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How to choose a lab
- Pick a lab on the official list above that is certified for each test you need (bacteria and chemistry are often separate certifications).
- Ask for the lab’s own sample bottles and instructions; bacteria samples usually must reach the lab within 24–30 hours.
- Compare prices for a basic package (bacteria, nitrate, pH/TDS) and add arsenic or other metals where local data shows a risk.
- Be wary of free in-home tests from treatment-system sellers — see our salesperson checklist.
Questions
Where can I get my well water tested in New Hampshire?
Use a lab on New Hampshire’s official certified-lab list. We count 8 listed labs (excluding those marked as serving public water systems only), most in Concord, Kennebunk, Lebanon. Confirm the lab is certified for the exact tests you need before you send a sample.
What should I test my well for in New Hampshire?
Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). In New Hampshire, 14% of sampled wells with arsenic data were above the EPA limit, so include arsenic. Use our test helper for a list that fits your home.
Is there well water data for my county in New Hampshire?
Yes for 10 counties: we show the share of sampled wells above the EPA arsenic and nitrate limits, from the Water Quality Portal (USGS/EPA). These are monitoring wells as well as private wells, so test your own well.