St. Mary'S Water Quality Report
4 cities ranked · Average grade: B- · Maryland
Avg Score
74.5
Cities Ranked
4
Health Violations
4
PFAS Detected
1
74.5
County avg score
4
Cities ranked
75%
A or B grade
0%
D or F grade
4
Health violations
1
PFAS detected
Grade Distribution
How St. Mary'S cities scored
A
1
25%
Excellent
B
2
50%
Good
C
1
25%
Fair
D
0
0%
Poor
F
0
0%
Failing
Comparison
County vs Maryland average
▲ 0.1 pts above state average
City Map
Water quality across St. Mary'S
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in St. Mary'S
County context
27.7%
of residents on fluoridated water (CDC, 2020)
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in St. Mary'S
Industrial polluters nearby
Facilities reporting the most surface-water releases in St. Mary'S, 2023.
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
SMO MECHANICSVILLE PLANT MECHANICSVILLE, MD20659 | — | — |
US NAVAL AIR STATION PATUXENT RIVER PATUXENT RIVER, MD20670 | — | — |
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 4 cities in St. Mary'S
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Patuxent River | A- | 86.7 | 22K | 58 | Health Unresolved | |
| 2 | Lexington Park | B+ | 81.1 | 892 | 20 | Health Unresolved | |
| 3 | Leonardtown | B- | 70.5 | 5K | 66 | Health Unresolved | |
| 4 | California | C- | 59.6 | 60K | 77 | Health Unresolved |