Last checked: October 23, 2026

Registered well drilling companies and accredited drinking water labs in Maine

Maine licenses well drillers and pump installers, and keeps a separate list of registered well drilling companies. This page lists every company on that list and every lab on Maine CDC's list of in-state commercial drinking water labs. Filter by county or search by name.

How Maine licenses well drillers and pump installers

• The Maine Water Well Commission (also called the Well Drillers' Commission) sets standards for well location and construction and minimum requirements for well driller and pump installer licenses. It also investigates complaints about possible violations of the Well Drillers and Pump Installers Rules, 144 CMR 232.¹
• Two lists. The Commission publishes a list of licensed individuals (well drillers and pump installers) and a list of well drilling companies. Both are "licensed in Maine only" listings.¹ This page uses the company list, dated 7/8/2026.²
• Who to ask: the Commission's clerk at [email protected] or (207) 287-2070. Maine CDC also has a well driller complaint form on the same page.¹
• Labs are accredited test by test. Maine CDC says to check with a lab to find out exactly which tests it's accredited for. You can confirm a lab's tests by calling the Maine Drinking Water Program at 207-287-2070 and asking for the Laboratory Accreditation Officer.³

Check a license yourself

• Drillers and pump installers (individuals): the Commission's Well Drillers and Pump Installers - Individuals list (PDF) shows each person's license number, expiration and driller/installer grade. Ask whoever comes to your property for their license number and check it there.¹
• Companies: the Well Drilling Companies list (PDF), linked from the Commission's page.¹
• Labs: Maine CDC's in-state commercial drinking water labs (PDF). That list links a spreadsheet of every lab Maine accredits, including out-of-state labs.³

The list

Drilling companies: every company on the Commission's list, with the registration number (WDC) and the expiration date it shows. The list gives a mailing town but no county. We matched each Maine town to its county using the U.S. Census Bureau's list of Maine towns;⁴ where the mailing address is a village or post office name that isn't a town (for example Springvale or Cumberland Center), the county shows as not listed, so search by town too. Out-of-state companies are grouped by state. Labs: the labs on Maine CDC's in-state list, as Maine CDC names them (including notes such as "PFAS only" or "bacteria only"), with the website Maine CDC lists. Maine CDC notes that if you mail samples, you should check that the lab can receive bacteria samples within the holding time.³ Home inspectors: we haven't loaded a Maine home inspector list.

Sources for this list

• Maine Water Well Commission (Maine CDC Drinking Water Program), Well Drilling Companies list dated 7/8/2026 (2026-07-08): 112 entries
• Maine CDC, Maine In-State Commercial Drinking Water Labs (last updated 5/16/2026) (2026-05-16): 12 entries

Home inspectors and well inspections

A standard home inspection usually doesn't include a full check of the well. If you're buying or selling a home with a well, ask the home inspector whether they do a well flow (yield) test and water sampling, which state-certified lab runs the samples, and whether they look at the well cap, pressure tank and pump controls. Otherwise, hire a licensed well contractor for the well itself and a certified lab for the water. Are you a home inspector? See our well inspection guide for home inspectors.

NGWA (the National Ground Water Association, a private trade group) recommends a yearly well checkup by a qualified water well professional: a flow test, checks of the water level, pump, pressure tank and switch, a sanitary and code check, a coliform bacteria and nitrate test (plus anything of local concern), and a written report.⁵ To find one, use NGWA's contractor lookup on wellowner.org and its certified professionals directory. These are run by a trade association, not a state agency, so still check the state license.

Where a state publishes its home inspector license list, we load it on that state's page (currently North Carolina and New York). Other states we cover: Texas licenses inspectors through the Texas Real Estate Commission, but TREC's public data file doesn't include a location, so use TREC's license holder search. Wisconsin credentials home inspectors through DSPS, which sells its list rather than publishing it, so use DSPS's credential search. Pennsylvania and Michigan don't have a state license list for home inspectors that we could use.

Water treatment dealers

We list water treatment dealers (softener, filter and treatment system installers) only where a state publishes an official license list. A few states license this work. Where a state publishes its license list we load it (so far Texas: TCEQ Water Treatment Specialists), and where we've found a state license without a usable list, it's noted on that state's page, so check with your state too. To find someone with a voluntary credential, use these lookups. They are run by private trade associations, not by any government agency. A listing there is not a state license, and these groups mostly list their own members:

• Water Quality Association (WQA): Find a WQA-certified professional (people who hold WQA's voluntary certifications) and find WQA-certified treatment products (products WQA has tested and certified).
• National Ground Water Association (NGWA): Find a water well contractor on NGWA's wellowner.org (NGWA members; NGWA says it "neither endorses nor guarantees the work of any company listed")⁶ and the directory of NGWA-certified professionals.

Before you buy treatment, get your water tested by a state-certified lab (each state page lists or links them) and run the results through the free Well Test Results Checker, so you only treat for what's actually in your water.

Questions to ask before hiring a well contractor

Get information on several contractors before you choose.⁷ These questions come from the National Ground Water Association's well owner guidance and New York DEC's consumer checklist:⁷⁸

• Are you licensed, registered or certified by the state for this work? Not every state requires it. Check the answer yourself with the state lookup on this page.
• Is the person supervising the job certified? NGWA offers voluntary certification; its highest level is Master Groundwater Contractor (MGWC).⁷
• Do you file a well log or completion report, and will I get a copy? Some states require the driller to give the owner a copy (New York does, for example).⁸ Keep it with your deed.⁷
• What liability and workers' compensation insurance do you carry?⁷
• Can I talk to recent customers? Ask for references and call them.⁸
• Will you give me a written contract?⁷ In New York, for example, home improvement work over $500 needs a written contract by law.⁸
• Do I need a local permit? Check with your local health and building code officials. Some counties set their own rules.⁸

What to check on a quote

Get more than one estimate.⁸ NGWA says an itemized list of charges is better than a lump sum, because you can't compare offers unless you know what each one covers.⁷ For a drilled well, look for:⁷

• Price per foot of drilling and per foot of casing, plus the casing diameter and thickness
• Other materials (drive shoe, grout, well cap) and other steps (grouting, development, test pumping, disinfection)
• The type of well cap or seal, and the disinfection procedure
• What happens, and what it costs, if they must drill deeper or drill a second well, or abandon and seal a dry or bad hole
• Cleanup of the site, an expected start date, and a guarantee of materials and workmanship
• A statement that the work will meet state and local codes
• What is not included

When the well is finished, NGWA suggests checking the depth against the construction report, asking what yield (gallons per minute) the well was tested at, making sure the cap is secure and at least 6 inches above ground, asking whether the well was disinfected, and getting your copy of the well record.⁷

Buying treatment? Test first. A lab report from a state-certified lab tells you what you're actually treating for. Pennsylvania DEP, for example, says to pick a treatment device for the specific contaminant your test found, and points to NSF's product database.⁹ Put your numbers into our free Well Test Results Checker to see how they compare with EPA benchmarks.

More for Maine well owners

• Private wells in Maine: the seller disclosure rules, what Maine CDC says to test for, the state lab's kits and who to call
• County pages: Cumberland County · Penobscot County
• Arsenic in well water · Uranium and radon in well water