St. Tammany Parish Water Quality Report
9 cities ranked · Average grade: C · Louisiana
Avg Score
63.2
Cities Ranked
9
Health Violations
9
PFAS Detected
4
63.2
County avg score
9
Cities ranked
33%
A or B grade
44%
D or F grade
9
Health violations
4
PFAS detected
Grade Distribution
How St. Tammany Parish cities scored
A
3
33%
Excellent
B
0
0%
Good
C
2
22%
Fair
D
0
0%
Poor
F
4
44%
Failing
Comparison
County vs Louisiana average
▼ 2.3 pts below state average
City Map
Water quality across St. Tammany Parish
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in St. Tammany Parish
Worst cities
County context
1.3%
of residents on fluoridated water (CDC, 2020)
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in St. Tammany Parish
Industrial polluters nearby
Facilities reporting the most surface-water releases in St. Tammany Parish, 2023.
Total reported releases to surface water: 0 lbs
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
PEBBLE TECHNOLOGY INTERNATIONAL SLIDELL, LA70460 | Lead And Lead Compounds | 0 |
PAVESTONE - NEW ORLEANS LA PLANT LACOMBE, LA70445 | — | — |
US ARMY NATIONAL GUARD - CAMP VILLERE RANGE(S) SLIDELL, LA70460 | — | — |
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 9 cities in St. Tammany Parish
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Pearl River | A | 92.2 | 4K | 11 | Health Unresolved | |
| 2 | Abita Springs | A | 90.8 | 4K | 13 | Health Unresolved | |
| 3 | Folsom | A- | 89.6 | 2K | 11 | Health Unresolved | |
| 4 | Madisonville | C+ | 66.3 | 2K | 54 | Health Unresolved | |
| 5 | Sun | C | 64.9 | 726 | 31 | Health Unresolved | |
| 6 | Mandeville | F | 42.9 | 65K | 578 | Health Unresolved | |
| 7 | Loranger | F | 42 | 2K | 148 | Health Unresolved | |
| 8 | Covington | F | 40.9 | 84K | 273 | Health Unresolved | |
| 9 | Slidell | F | 39.5 | 48K | 396 | Health Unresolved |