Find a Water Test Add or claim a listing

State-certified water testing labs in Maryland

38 state-accredited labs for drinking and well water testing in Maryland.

18 cities & counties38 certified labs

Source: MDE list of certified drinking water laboratories, list dated Oct 1, 2026. Find a Water Test is independent and not affiliated with the Maryland Department of the Environment. Certification covers specific tests, so confirm the lab is certified for the ones you need: Verify a certification.

Major cities

Baltimore 6Aberdeen 2Annapolis 2Frederick 2Salisbury 2Stevensville 2Towson 2

Counties in Maryland A–Z

Smaller counties in Maryland

Counties with only a few listings so far, grouped by county.

Garrett County 1

DC

Deep Creek Lake Laboratory

762 Mayhew Inn Road, Oakland, MD

State-accredited labDrinking waterBacteria testingPublic or utility lab

Public water system lab. Many don't accept private well samples, so call first.

(301) 387-6162Directions
Claim, correct or remove

Howard County 1

HC

Howard County Government - Little Patuxent Water Reclamation Plant

8900 Greenwood Place, Savage, MD

State-accredited labDrinking waterBacteria testingPublic or utility lab

Public water system lab. Many don't accept private well samples, so call first.

(410) 313-1210Directions
Claim, correct or remove

Montgomery County 1

WS

Washington Suburban Sanitary Commission Laboratory Division

12245 Tech Road, Silver Spring, MD

State-accredited labDrinking waterBacteria testingChemical testingPublic or utility lab

Public water system lab. Many don't accept private well samples, so call first.

(301) 206-7575Directions
Claim, correct or remove

St. Mary's County 1

SM

St. Mary's Metcom DW Lab - Lexington Park

48020 Pine Hill Run Road, Lexington Park, MD

State-accredited labDrinking waterBacteria testingPublic or utility lab

Public water system lab. Many don't accept private well samples, so call first.

(301) 737-7400Directions
Claim, correct or remove

Worcester County 1

TO

Town of Ocean City Laboratory Services

6405 Seabay Drive, Ocean City, MD

State-accredited labDrinking waterBacteria testingChemical testingPublic or utility lab

Public water system lab. Many don't accept private well samples, so call first.

(410) 723-5090Directions
Claim, correct or remove

Mail-in labs that ship to Maryland

How mail-in testing works

Bad result? Get help from water treatment pros near Maryland

Tell us what your test found and we'll connect you with up to three local water treatment companies.

What happens next

  1. We match your ZIP to water treatment companies nearby.
  2. They contact you directly to talk through your results.
  3. Compare options and pick one, or none. No fee, no obligation.

Free, no obligation. We don't sell your details to anyone else.

Just need a lab? Every certified lab is listed above with directions.