ST. MARY'S METCOM DW LAB - LEXINGTON PARK

At a glance

Price

not published on the state list: ask the lab for a quote

Turnaround

not stated on the state list or the lab’s website: ask when you order

Homeowner samples

not stated: ask the lab

Lab facts

Listed by

Maryland (Maryland Department of the Environment (MDE) - Water Supply Program, Laboratory Certification Program)

Address

48020 Pine Hill Run Road, Lexington Park, MD 20653 · Open in Google Maps

Phone

(301) 737-7400

Public / homeowner samples

Public samples: ask the lab

Not stated per lab. MDE's Be Well Wise page for private well owners says: "Have your water tested periodically by a state-certified laboratory that conducts a drinking water test." It names no lab, and MDE's list does not say which labs take samples from homeowners.

Left blank on the list

The Maryland list (version Latest Revisions: 10/1/2026) gives no website for this lab.

Certification record

Certificate ID

G-1055

Issued by

Maryland Department of the Environment (MDE) - Water Supply Program, Laboratory Certification Program (certification program)

List version

Maryland's Certified Drinking Water Laboratories (MDE Laboratory Certification Program), version Latest Revisions: 10/1/2026

We fetched it

7 Nov 2026 (file SHA-256 9d19de9053bf…) · open the state file

Tests on the state list

This list does not break certification down by analyte. Ask the lab which tests it is certified for; the groups as written on the list are below.

• Named on the official list The state list names this analyte (or a column for it) for this lab.
• Group-level certification Certified for a parent group (e.g. 'Inorganics') that includes this analyte. Confirm the specific test with the lab.
• Partial group certification The list marks the group as 'Partial'. Confirm this analyte with the lab.
• Subcontracted The lab sends this analyte to another accredited lab (MDH 'X*').

MDE prints the approved tests as "Micro 4" (codes keyed to MDE's List of Approved Contaminants, Revised 10/10/2024). MDE prints no expiry date. MDE's key describes Microbiology Group 4 only as "Enzyme Substrate Determinations" and does not name coliform bacteria or E. coli, so no bacteria certification is shown. Ask the lab. MDE also prints: (new lab as of 5/9/2024).

Nearest labs that take homeowner samples

No other lab that takes homeowner samples is within 25 miles of this lab; the nearest is 36 miles away. Distances are straight-line from the address on the state list (approx. = ZIP-code centre). “Takes homeowner samples” comes from a state list column or the lab’s own website, as named.

Price and turnaround as printed on each lab’s own website and checked by a second reader; – = not published or not read yet.

Around this lab: St. Mary's County, MD

• Private wells: about 46,880 people, 42% of St. Mary's County’s 111,413 residents (USGS, 2015); rank 13 of 24 counties in Maryland by people on wells.
• At house sale: Statewide (Real Property Article) has a well_test rule (Md. Code, Real Property § 10-713 (Ch. 587 of 2023, HB 11, Private Well Safety Act of 2023)). What it requires

• EPA radon zone (indoor air): Zone 2: moderate potential (average indoor radon may be between 2 and 4 pCi/L). EPA says the zone map should not decide whether one home needs testing.
• Arsenic above 10 µg/L (USGS model): about 2,348 private-well users (95% range 1,510 to 3,620; 2010 base), rank 6 of 24 in the state. A screening estimate, not a measurement of any well.
• Older homes (Census ACS 2020–2024): 30% of 46,385 housing units were built before 1980, below the state share of 51%. Homes built before 1986 are more likely to have lead solder or fittings, so test tap water for lead there.
• PFAS in public water nearby (public supply, not your well): 4 public systems serving this county reported EPA UCMR 5 results; 0 had a PFOA or PFOS sample at or above 4.0 ng/L.

County figures describe where the lab is, not the lab. Sources: USGS 2015 water use and 2017 arsenic estimates, EPA radon zones, Census ACS table B25034 (2020–2024), EPA UCMR 5 (2023–2026); details and links on the sources page.

Before you send a sample

Call the lab to confirm it's currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Bacteria samples have short holding times. Status can change between list updates. To check a status, contact the Maryland certification program.

Is this your lab?

Labs can ask for corrections through the agency that publishes their state list. Homeowner service, prices and turnaround above come only from the lab’s own website. To ask us to correct or remove this listing, write to us (how we handle listings).