St. John The Baptist Parish Water Quality Report
1 cities ranked · Average grade: D+ · Louisiana
Avg Score
52.5
Cities Ranked
1
Health Violations
1
PFAS Detected
1
52.5
County avg score
1
Cities ranked
0%
A or B grade
100%
D or F grade
1
Health violations
1
PFAS detected
Grade Distribution
How St. John The Baptist Parish cities scored
A
0
0%
Excellent
B
0
0%
Good
C
0
0%
Fair
D
1
100%
Poor
F
0
0%
Failing
Comparison
County vs Louisiana average
▼ 13.0 pts below state average
City Map
Water quality across St. John The Baptist Parish
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in St. John The Baptist Parish
Best cities
Worst cities
County context
98.9%
of residents on fluoridated water (CDC, 2020)
258,248
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in St. John The Baptist Parish
Industrial polluters nearby
Facilities reporting the most surface-water releases in St. John The Baptist Parish, 2023.
Total reported releases to surface water: 258,248 lbs
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
MARATHON PETROLEUM CO LP GARYVILLE, LA70051 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 256,703 |
NALCO CO GARYVILLE, LA70051 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 836 |
DENKA PERFORMANCE ELASTOMER LLC LA PLACE, LA70068 | Nickel | 694 |
MT. AIRY TERMINAL LLC MOUNT AIRY, LA70076 | Lead compounds | 15 |
PINNACLE POLYMERS GARYVILLE, LA70051 | — | — |
+ 5 more facilities
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 1 cities in St. John The Baptist Parish
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Laplace | D+ | 52.5 | 47K | 142 | Health Unresolved |