What was found in Monroe'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 |
|---|---|---|---|
| Copper | 250 µg/L 19% of the EPA limit 1300 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 920 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Fluoride | 80.05 µg/L 2% of the EPA limit 4000 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 716.5 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2018 | 2/2 | SYR4 |
| Nitrate-Nitrite | 190 µg/L 1.9% of the EPA limit 10000 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 1/2 | SYR4 |
| TTHM | 58.1 µg/L 73% of the EPA limit 80 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 102.54 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 71.3 µg/L 119% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Bromoform | 58.62 µg/L No EPA limit set Highest in the city: PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 1/2 | SYR4 |
| Chloroform | 54.22 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 47.195 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 4.184 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 33.505 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Barium | 25.7 µg/L 1.3% of the EPA limit 2000 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 23.26 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 0.8900 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 19.55 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Lead | 8.35 µg/L 56% of the EPA limit 15 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 18.5 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 15.315 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 6.57 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 11.4 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Dalapon | 8.496 µg/L 4.2% of the EPA limit 200 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 2.29 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 8.05 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 3.94 pCi/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Arsenic | 1.17 µg/L 12% of the EPA limit 10 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019
Highest in the city: 3 µg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2018 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.5386 pCi/L 51% of the EPA limit 5 pCi/L Highest in the city: PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2018 | 1/2 | SYR4 |
| Atrazine | 1.06 µg/L 35% of the EPA limit 3 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 1/2 | SYR4 |
| Mercury | 1 µg/L 50% of the EPA limit 2 µg/L Highest in the city: PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2018 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.9685 µg/L 19% of the EPA limit 5 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9685 µg/L 16% of the EPA limit 6 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 2/2 | SYR4 |
| Hexachlorocyclopentadiene | 0.0666 µg/L 0.1% of the EPA limit 50 µg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0082 µg/L No EPA limit set Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CITY OF MONROE WATER SYSTEM · 57,000 people · 2025
Highest in the city: 0.0023 mg/L — PRAIRIE ROAD WATER DISTRICT · 2,598 people · 2025 | 2/2 | 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 Monroe
| Supplier | Population served |
|---|---|
| CITY OF MONROE WATER SYSTEM | 57,000 |
| PRAIRIE ROAD WATER DISTRICT | 2,598 |
Frequently asked questions about Monroe tap water
Is Monroe tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Monroe. 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 Monroe?
2 public water suppliers report drinking-water monitoring for Monroe, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Monroe's water?
The contaminants EPA monitoring detected in Monroe include Copper, Fluoride, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5). 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.