St. Mary's, MD
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for St. Mary's in Maryland · Population: 114,372
St. Mary's, MD is tracked across three EPA datasets covering 2 Toxics Release Inventory (TRI) facilities, 33 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 24/100 (Low Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 37.0K lbs of reported toxic releases under EPCRA Section 313, while 3 water systems carry an active health-based violation in the SDWIS record. No EPA Air Quality System monitors currently report data for this county.
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
Water Systems (33)
| System | Population | Violations |
|---|---|---|
| LEXINGTON PARK | 43,030 | 0 |
| PATUXENT NAVAL AIR STATION (NAVFAC-WASH) | 22,000 | 0 |
| TOWN OF LEONARDTOWN | 5,000 | 2 |
| COUNTRY LAKES | 3,016 | 0 |
| CEDAR COVE | 2,728 | 0 |
| WICOMICO SHORES | 1,262 | 0 |
| GREENBRIER | 1,161 | 0 |
| BRETON BAY | 1,012 | 0 |
| LORD CALVERT TRAILER PARK | 892 | 1 |
| HUNTING QUARTERS | 715 | 0 |
| ROLLING ACRES | 699 | 0 |
| PINEY POINT | 672 | 0 |
| ST. CLEMENTS SHORES | 620 | 0 |
| CHARLOTTE HALL | 615 | 0 |
| FORREST FARM SUBDIVISION | 577 | 0 |
| LAUREL RIDGE | 560 | 0 |
| PERSIMMON HILLS | 514 | 0 |
| WILDERNESS RUN | 511 | 0 |
| BIRCH MANOR | 272 | 0 |
| GRANDVIEW HAVEN | 269 | 0 |
| PINEY POINT LANDINGS | 239 | 0 |
| VILLAGES AT LEONARDTOWN | 239 | 0 |
| FENWICK MANOR | 234 | 0 |
| LEONARDTOWN FARM | 193 | 0 |
| SOUTHGATE | 188 | 0 |
| KING & KENNEDY | 169 | 0 |
| HOLLAND FOREST | 139 | 0 |
| FOX MEADOW | 128 | 0 |
| COOK'S TRAILER COURT (AKA GARRETT TP) | 120 | 0 |
| CHRISTMAS TREE FARM TRAILER PARK | 100 | 5 |
| MULBERRY SOUTH | 65 | 0 |
| HEARTS DESIRE | 65 | 0 |
| WILD GOOSE CREST SUBDIVISION | 65 | 0 |
TRI Facilities (2)
| # | Facility | Total Releases |
|---|---|---|
| 1 | US Naval Air Station Patuxent River | 37.0K lbs |
| 2 | Smo Mechanicsville Plant | 0 lbs |
Cities in St. Mary's (3)
Frequently Asked Questions
What is the environmental risk level in St. Mary's, Maryland? ▼
Are there Superfund sites in St. Mary's? ▼
How many toxic release facilities are in St. Mary's? ▼
What is the air quality in St. Mary's? ▼
Is the drinking water safe in St. Mary's? ▼
What environmental agencies cover St. Mary's? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.