What was found in Zwolle'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 |
|---|---|---|---|
| Fluoride | 3930 µg/L 98% of the EPA limit 4000 µg/L Highest in the city: TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2018 | 3/5 | SYR4 |
| Copper | 300 µg/L 23% of the EPA limit 1300 µg/L Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 1050 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| TTHM | 143.2 µg/L 179% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 177.3 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Barium | 130 µg/L 6.5% of the EPA limit 2000 µg/L Highest in the city: EBARB WWKS DIST #1 - MARSH · 54 people · 2017 | 3/5 | SYR4 |
| Chloroform | 69.4 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 72.73 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 52.82 µg/L 88% of the EPA limit 60 µg/L Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 70.37 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 69 µg/L 0.7% of the EPA limit 10000 µg/L Highest in the city: EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 3/5 | SYR4 |
| Dibromochloromethane | 62.43 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 42.48 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 59.46 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 16.365 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 36 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Monochloroacetic Acid | 34.5 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019 | 4/5 | SYR4 |
| Bromoform | 30.16 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 16 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 20.83 µg/L — EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 5/5 | SYR4 |
| Dibromoacetic Acid | 17.74 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019 | 5/5 | SYR4 |
| Monobromoacetic Acid | 3.5 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 14.75 µg/L — TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2019 | 4/5 | SYR4 |
| Lithium | 11.2 µg/L No EPA limit set Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2023 | 1/5 | UCMR-5 |
| Lead | 8.75 µg/L 58% of the EPA limit 15 µg/L Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2019
Highest in the city: 9 µg/L — EBARB WWKS DIST #1 - MARSH · 54 people · 2018 | 5/5 | SYR4 |
| Gross Beta Particle Activity | 4.6115 pCi/L No EPA limit set Highest in the city: TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2017 | 3/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.7312 pCi/L 35% of the EPA limit 5 pCi/L Highest in the city: EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 3/5 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.23 µg/L 21% of the EPA limit 6 µg/L Highest in the city: TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2017 | 3/5 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Highest in the city: EBARB WWKS DIST #1 - NORTH EBARB · 1,761 people · 2019 | 1/5 | SYR4 |
| Mercury | 1 µg/L 50% of the EPA limit 2 µg/L Highest in the city: TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2017 | 1/5 | SYR4 |
| Dalapon | 0.7200 µg/L 0.4% of the EPA limit 200 µg/L Highest in the city: TOWN OF ZWOLLE WATER SYSTEM · 2,520 people · 2017 | 1/5 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: EBARB WWKS DIST # 1 - AIMWELL AREA · 6,738 people · 2025
Highest in the city: 0.0015 mg/L — EBARB WWKS DIST # 1 - N EBARB/BELMONT · 789 people · 2025 | 5/5 | 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 Zwolle
| Supplier | Population served |
|---|---|
| EBARB WWKS DIST # 1 - AIMWELL AREA | 6,738 |
| TOWN OF ZWOLLE WATER SYSTEM | 2,520 |
| EBARB WWKS DIST #1 - NORTH EBARB | 1,761 |
| EBARB WWKS DIST # 1 - N EBARB/BELMONT | 789 |
| EBARB WWKS DIST #1 - MARSH | 54 |
Frequently asked questions about Zwolle tap water
Is Zwolle tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Zwolle. 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 Zwolle?
5 public water suppliers report drinking-water monitoring for Zwolle, Louisiana to the EPA. Each is listed above with its population served.
What contaminants are in Zwolle's water?
The contaminants EPA monitoring detected in Zwolle include Fluoride, Copper, TTHM, Barium, Chloroform. 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.