What was found in Laplace's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 73 µg/L 0.7% of the EPA limit 10000 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 2000 µg/L — ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 3/4 | SYR4 |
| Copper | 326.2 µg/L 25% of the EPA limit 1300 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 925 µg/L — ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 4/4 | SYR4 |
| Fluoride | 807 µg/L 20% of the EPA limit 4000 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 855 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Barium | 37.8 µg/L 1.9% of the EPA limit 2000 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 307 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| TTHM | 4.67 µg/L 5.8% of the EPA limit 80 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 134.22 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Chloroform | 4.67 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 99.49 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 20.325 µg/L 34% of the EPA limit 60 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 79.64 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 8.025 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 39.83 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 11.025 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 35.35 µg/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Dalapon | 33.279 µg/L 17% of the EPA limit 200 µg/L Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 2/4 | SYR4 |
| Bromodichloromethane | 22.09 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 33.155 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 7.01 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 10.9 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Lithium | 10.3 µg/L No EPA limit set Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2025 | 2/4 | UCMR-5 |
| Lead | 9.39 µg/L 63% of the EPA limit 15 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018 | 4/4 | SYR4 |
| Monochloroacetic Acid | 2.9 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 7.34 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Gross Beta Particle Activity | 1.66 pCi/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 4.1465 pCi/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Dibromoacetic Acid | 1.75 µg/L No EPA limit set Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2019
Highest in the city: 4.11 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Monobromoacetic Acid | 2.81 µg/L No EPA limit set Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.0839 pCi/L 22% of the EPA limit 5 pCi/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 2.4395 pCi/L — PLEASURE BEND WATER SUPPLY · 528 people · 2019 | 4/4 | SYR4 |
| Bromoform | 2.008 µg/L No EPA limit set Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 3/4 | SYR4 |
| Arsenic | 1.37 µg/L 14% of the EPA limit 10 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 1.68 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 4/4 | SYR4 |
| Xylenes, Total | 1.637 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 1/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.5095 µg/L 8.5% of the EPA limit 6 µg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2018
Highest in the city: 1.1575 µg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 3/4 | SYR4 |
| Combined Uranium | 0.8185 µg/L 2.7% of the EPA limit 30 µg/L Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2017 | 2/4 | SYR4 |
| Simazine | 0.6895 µg/L 17% of the EPA limit 4 µg/L Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 2/4 | SYR4 |
| Selenium | 0.6455 µg/L 1.3% of the EPA limit 50 µg/L Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 1/4 | SYR4 |
| Ethylbenzene | 0.6075 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 1/4 | SYR4 |
| 1,2-Dichloroethane | 0.6000 µg/L 12% of the EPA limit 5 µg/L Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 1/4 | SYR4 |
| Carbon Tetrachloride | 0.5000 µg/L 10% of the EPA limit 5 µg/L Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 1/4 | SYR4 |
| Atrazine | 0.4330 µg/L 14% of the EPA limit 3 µg/L Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2019 | 2/4 | SYR4 |
| Hexachlorocyclopentadiene | 0.0458 µg/L 0.1% of the EPA limit 50 µg/L Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2019 | 1/4 | SYR4 |
| Pfba | 0.0060 µg/L No EPA limit set Highest in the city: ST JOHN WATER DISTRICT 1 · 10,484 people · 2025 | 2/4 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Highest in the city: ST JOHN WATER DISTRICT 2 · 3,702 people · 2023 | 1/4 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: ST JOHN WATER DISTRICT 3 · 31,965 people · 2023
Highest in the city: 0.0020 mg/L — ST JOHN WATER DISTRICT 1 · 10,484 people · 2024 | 4/4 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Laplace
| Supplier | Population served |
|---|---|
| ST JOHN WATER DISTRICT 3 | 31,965 |
| ST JOHN WATER DISTRICT 1 | 10,484 |
| ST JOHN WATER DISTRICT 2 | 3,702 |
| PLEASURE BEND WATER SUPPLY | 528 |
Frequently asked questions about Laplace tap water
Is Laplace tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Laplace. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Laplace?
4 public water suppliers report drinking-water monitoring for Laplace, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Laplace's water?
The contaminants EPA monitoring detected in Laplace include Nitrate-Nitrite, Copper, Fluoride, Barium, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.