Water Testing in New Hampshire
Find a state-certified drinking water laboratory, see what to test for first, and learn how to read your results.
Getting your water tested in New Hampshire
Drinking water labs serving New Hampshire are certified by the New Hampshire Department of Environmental Services under the NH Environmental Laboratory Accreditation Program (NHELAP). Certification is a federal requirement under 40 CFR 142 — only state-certified labs can produce results that count for regulatory, real-estate, or legal purposes. Across 119 New Hampshire cities tested by WaterVerge, our data shows 58 cities with lead exceeding the EPA action level, 21 cities with PFAS detections (15 above the 2024 limits), 118 cities with health-based violations on record. That context shapes which tests are worth prioritizing. For peace-of-mind testing or filter selection, a reputable mail-in kit will do. For real-estate transactions, well permits, landlord disputes, school testing, or any result that has to be defensible, you must use a state-certified laboratory.
Should you test your water?
What to test for in New Hampshire
Recommendations driven by water-quality patterns we observe in New Hampshire cities. Your specific situation may require additional analytes.
- 01
Lead
58 New Hampshire cities have lead exceeding the EPA action level. Lead in tap water comes from service lines and home plumbing — your tap may have it even when the system overall is fine.
Lead in New Hampshire data → - 02
PFAS
PFAS "forever chemicals" detected in 21 New Hampshire cities, 15 above the 2024 EPA limits. Look for labs accredited to EPA Method 533 or 537.1.
PFAS in New Hampshire data → - 03
Nitrate & bacteria
62% of tested New Hampshire cities rely on groundwater. Wells and ground-sourced systems should screen for nitrate, arsenic, and total coliform regularly.
What it costs & how long it takes
Mail-in kits vs. state-certified labs
Mail-in test kits
- Best for: general curiosity, picking a filter, screening for a single concern, comparing tap to filtered water.
- Not for: real-estate transactions, legal disputes, well permits, anything where the result needs to be defensible.
- Most kits use accredited partner labs but the chain-of-custody isn't certified. Cheaper, simpler, fine for personal use.
State-certified labs
- Best for: regulatory compliance, well permits, legal evidence, landlord disputes, school/daycare testing, formal complaints to your utility.
- Tradeoffs: more expensive, may require courier/dropoff with strict timing, sample bottles coordinated in advance.
- The directory above lists every lab New Hampshire has formally certified. Pick from this list if the result needs to count.
How to pick the right lab
- 01Confirm certification scope. A lab can be certified for some methods and not others. Verify they're accredited specifically for what you want tested (e.g. EPA 533 for PFAS, EPA 200.8 for lead).
- 02Use the official sample bottles. Labs ship pre-cleaned, pre-preserved bottles. Don't substitute — improper containers invalidate results.
- 03Mind the hold times. Bacteria samples ~30 hours. Metals 6 months. VOCs 14 days. Plan shipping accordingly.
- 04Get a written report, not just numbers. Reputable labs include MDL/MRL (detection limits), regulatory limits, and method codes — you need these to interpret results.
- 05Confirm the result will hold up. If it's for a real-estate sale, court case, or regulatory dispute, the lab must be state-certified and follow chain-of-custody procedures.
Look up your city in New Hampshire
All 119 cities →Before testing, check what's already on record for your local water system — it tells you what to focus on.
Explore what's been measured in New Hampshire
Frequently asked questions about water testing in New Hampshire
Where can I get my water tested in New Hampshire?
New Hampshire certifies drinking water labs through the New Hampshire Department of Environmental Services (NH Environmental Laboratory Accreditation Program (NHELAP)). The official directory is hosted at www4.des.state.nh.us. Use a state-certified lab if you need results that hold up for legal, real-estate, or regulatory purposes.
How much does it cost to test water in New Hampshire?
A single-contaminant test (lead, nitrate, bacteria) typically runs $25–$60. A general panel covering common parameters is usually $50–$150. A comprehensive panel including PFAS or VOCs runs $250–$450 or more depending on the analyte list. Mail-in kits are cheaper but may not be accepted as legal evidence.
What contaminants should I test for first?
Based on New Hampshire water-quality data, prioritize: Lead; PFAS; Nitrate & bacteria. Your specific home and source water determine the rest — homes built before 1986 should always test for lead.
Do I need a state-certified lab, or is a mail-in kit enough?
For peace-of-mind testing or to inform a filter purchase, a reputable mail-in kit is fine. For real-estate transactions, well permits, landlord disputes, or any result you need to defend, you must use a state-certified drinking water laboratory. Certified labs follow EPA-approved methods and are audited by the state.
How do I collect a water sample correctly?
The lab provides specific bottles and instructions — follow them exactly. For lead, run a "first draw" sample (water that has sat in pipes 6+ hours). For bacteria, sterilize the tap and avoid touching the bottle interior. For VOCs, fill bottles to the brim with no headspace. Improper collection is the #1 cause of unreliable results.
How long do results take?
Most chemical tests return in 5–10 business days. Bacterial tests are quicker (24–48 hours after the lab receives the sample). PFAS and specialty methods can take 2–4 weeks. Rush turnaround is usually available for an extra fee.