Certified well water labs in Maine (2026)

WellTestList · Monday, September 28, 2026 · state page

MaineTracking Network puts more than half of Maine people on private residential wells — among the highest shares in the U.S. University of Maine Cooperative Extension says about half of residents drink from a private source. Those taps are not under the Safe Drinking Water Act the way public systems are. You pick an accredited laboratory — usually Maine’s Health and Environmental Testing Laboratory (HETL) kit from the state webshop, or a commercial lab on the state’s in-state list — and plan around a 30-hour bacteria clock. Arsenic, uranium, and radon in crystalline-bedrock aquifers are the local hedges Maine CDC names first.

The short version

1. Order a HETL kit, or call an accredited commercial lab. The state webshop sells homeowner packages (Basic Safety $42 for annual bacteria + nitrate/nitrite; Well Evaluation / New Well / Residential Home Sales $127; RES1 / RES2 with radon $147) plus a mandatory $2 Private Well Safe Drinking Water Fund fee on residential private-well orders. Or use a lab on Maine’s commercial accredited list.
2. Hit the 30-hour bacteria window — and skip Friday collection. HETL must receive the sample within 30 hours of collection. The lab is closed weekends and holidays and does not collect samples on Fridays, Saturdays, or the day before a holiday. Mail or drop at 47 Independence Drive, Augusta.
3. Match the panel to Maine rock and to the purpose of the test. Annual: coliform, E. coli, nitrate/nitrite. Every 3–5 years: arsenic, uranium, radon, and the rest of Maine CDC’s metals list. Selling? Title 33 § 173 is a disclosure statute, not a required sale test — but lenders still often want a panel. Landlords: arsenic every five years under Title 22 § 2660-Y.

How Maine’s system actually works

Maine CDC Private Well Water is the clearest state page: private wells are not regulated the way public systems are; the owner is responsible for testing and treating. Free technical help: 866-292-3474 (toll-free in Maine) or 207-287-4311, email ehu@maine.gov. Annual minimum: coliform bacteria, E. coli, nitrates and nitrites. Every 3–5 years: arsenic, chloride, copper, fluoride, hardness, iron, lead, magnesium, manganese, pH, radon, sodium, uranium. Test again when expecting a baby, when taste/odor/color changes, after the well runs dry and recovers, when buying a home, after treatment work, or after well work.

Maine CDC Laboratory Accreditation accredits environmental labs for drinking-water work. The short homeowner-facing PDF is Maine In-State Commercial Drinking Water Labs (text footer: Last updated 5/16/2026; file we fetched also shows Word metadata CreationDate May 18, 2026). A fuller Excel of all accredited labs sits on the same accreditation page. Labs are accredited by analyte — confirm bacteria, arsenic, radon, or PFAS before you ship. Accreditation questions: Drinking Water Program 207-287-2070 (ask for the Laboratory Accreditation Officer).

The Health and Environmental Testing Laboratory is the state lab that accepts private-well kits from homeowners. Order bottles through the HETL webshop (or the order form linked from the water page). Ship or drop samples to 47 Independence Drive, State House Station #12, Augusta, ME. HETL phone on the commercial list: (207) 287-2727.

UMaine Extension Well Water points homeowners to Maine CDC / HETL for kits and the annual vs 3–5-year schedule (bacteria and nitrates yearly; arsenic, radon, and uranium every three to five years). Extension does not run the lab itself.

Low-income path: Maine CDC’s Well Water Information Request form lets residents currently eligible for MaineCare, SNAP, TANF, or other benefit programs request a free HETL well-water test kit (eligibility may be confirmed against benefit rolls). Everyone else can still request the certified-lab list and arsenic / treatment information through the same form.

Options we verified

Fees and rules live on the HETL webshop, Maine CDC private-well and accreditation pages, legislature statutes, and the mail-in product pages. What we could verify with a public URL tonight:

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We did not find published county health-department private-well fee sheets tonight the way Maryland or Colorado counties post them. Maine’s public homeowner path is HETL + accredited commercial labs. Call your town or county environmental health if you have a local program — we are not inventing town fees.

Labs that clearly serve private wells (curated from Maine’s list)

Names, locations, lab codes, and phones below are copied from Maine’s In-State Commercial Drinking Water Labs PDF (Last updated 5/16/2026). We kept HETL plus in-state commercial names that are not labeled PFAS-only on that PDF, and we note where a lab’s own site shows a homeowner / kit path. Maine CDC does not endorse specific labs. We are not inventing commercial fees. Call for private-well acceptance, bottles, hold times, current fees, and whether your lender’s analyte list is covered.

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PDF labels: Eurofins Portland and Mi'Kmaq are bacteria only on the commercial list — do not assume metals or arsenic. NELAnalytical’s site has a Homeowners & Landlords / Order Kits path (verified tonight). Mi'Kmaq’s site advertises water test kits including total coliform, E. coli, and arsenic — still confirm current accreditation for each analyte. The same PDF also lists PFAS-only shops we are not treating as general private-well panels: Bigelow Laboratory for Ocean Sciences (East Boothbay), Maine Laboratories, LLC (Norridgewock), and Nova Analytic Labs / Nova EnviroLabs (Portland). For PFAS methods, see our PFAS Method 533 / 537.1 guide and Maine’s separate PFAS-accredited labs PDF on the accreditation page.

What Maine guidance actually warrants

Match the panel to the land. Maine CDC private-well pages, MaineTracking, UMaine Extension, and HETL product notes line up on the core schedule:

• Every year: total coliform, E. coli, nitrate and nitrite (Maine CDC; HETL Basic Safety is the state kit for that bundle). Especially before water goes to an infant under six months. If total coliform is present, treat it as a well-structure / contamination warning — boiling is a short-term fix only for microbes, not for nitrate or arsenic.
• Every 3–5 years / baseline: arsenic, chloride, copper, fluoride, hardness, iron, lead, magnesium, manganese, pH, radon, sodium, uranium (Maine CDC list). HETL Well Evaluation / RES1 / RES2 map onto that schedule.
• Arsenic (bedrock): Maine CDC and MaineTracking both stress that many Maine wells have too much arsenic. Maine’s tracking guideline for arsenic is 10 μg/L (same numeric value as the federal public-system MCL). Crystalline-rock aquifers are the classic New England story — test; do not guess from a neighbor’s result.
• Uranium and radon in water: on the same 3–5 year list. HETL sells radon-in-water ($42) and gross alpha ($122) kits; RES1/RES2 bundle radon into the broader panel. Follow bottle instructions carefully — radon leaves water if the sample is mishandled.
• Chloride / sodium near roads and coasts: on Maine CDC’s 3–5 year list (road salt and coastal influence are real local questions; we are not inventing a town exceedance map).
• Nitrate near septic or agriculture: take the annual nitrate/nitrite seriously. Public-supply MCL guidance is 10 mg/L as nitrogen. Do not boil high-nitrate water — boiling concentrates it.
• PFAS concern: Maine CDC publishes PFAS Q&A for private wells; § 2660-Z covers information when the department tests a private well for PFAS. Use a PFAS-accredited lab (separate list on the accreditation page). Details: PFAS Method 533 / 537.1.
• After a flood, well work, or a change in taste / color / odor: bacteria first. See our after-a-flood guide.

When the Certificate of Analysis arrives, more: how to read a well water report.

Hardware-store strips are screening-only. Softener sales “tests” are screening-only. Neither is what a lender or a landlord statute means by “tested.”

Hold times, collection, and shipping

Plan around HETL’s bacteria clock. From the state lab water page: samples must arrive within 30 hours of collection; the lab is closed weekends and holidays; do not collect on Fridays, Saturdays, or the day before a holiday. Address: 47 Independence Drive, State House Station #12, Augusta. Use the lab’s bottles and forms — wrong container, fill line, or missing date/time can invalidate the sample. Commercial labs set their own hold times; the commercial-list PDF warns you to confirm bacteria mailing provisions for your postal area. More after weather events: what to test after a flood.

Mail-in kits that work from Maine

Independent mail-in labs ship to and from Maine as ordinary domestic US kits. They email a PDF. They are not selling you a softener in the same breath. For a lender or a landlord statutory test, confirm the analyzing lab is Maine-accredited for the analytes named — mail-in self-collect often does not satisfy a named-lab letter. Listed prices we checked on September 28, 2026:

• Tap Score / SimpleLab Essential Well: $209 listed (54 analytes; standard shipping and prepaid return on the product page).
• National Testing Laboratories WaterCheck Basic: $220 listed plus free delivery on watercheck.com. Next-day return shipping is not included. Budget for overnight return on the bacteria bottle.

Those are listed prices, not coupons. Kits change. Read the current product page before you buy. If HETL Basic Safety at $42 (+$2) covers your annual bacteria + nitrate question and you can hit the 30-hour window — check that path before you spend $200 on a national kit for the same core question.

Side by side for a Maine well

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Real estate, landlords, and lenders

Maine does not appear to require a private-well water test as a condition of residential sale the way Maryland’s § 10-713 does. What Maine does require is disclosure. Under Title 33 § 173, a seller of residential real property must disclose, for a private water supply: system type and location, malfunctions, the date of the most recent water test (if any), and whether the seller has experienced an unsatisfactory test or a test with notations. That is a disclosure duty — not a mandate that a new test be run before closing. Buyers and lenders still often insist on a current panel (HETL’s Residential Home Sales / TSFHA kit is the state webshop’s sale-oriented SKU).

Landlords are different. Title 22 § 2660-Y (effective beginning January 1, 2022, and every five years thereafter) requires a landlord of a residential building to test each private drinking-water well that serves a tenant for arsenic, through a laboratory certified or accredited under section 567, and to give tenants the results within 10 days (including new tenants, who get the most recent results). Keep the accredited-lab chain of custody for that path.

Lenders and title companies may still name a lab, form, or “mortgage test” panel — use what they named. More: home purchase / lender chain of custody.

Related: New York · Maryland · Pennsylvania · Virginia · Colorado · PFAS 533 / 537.1 · how to read a report · after a flood · lender / CoC · cost table · Home Depot free kit vs a certified lab · How it works · back to the directory.