What was found in Lewiston'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 | 1001 µg/L 25% of the EPA limit 4000 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2019 | 1/4 | SYR4 |
| Nitrate | 200 µg/L 2% of the EPA limit 10000 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2016 | 1/4 | SYR4 |
| Nitrate-Nitrite | 194.39 µg/L 1.9% of the EPA limit 10000 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2019 | 1/4 | SYR4 |
| TTHM | 68.48849999999999 µg/L 86% of the EPA limit 80 µg/L Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 75.94799999999998 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Chloroform | 46.7225 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 51.463999999999984 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 36.14 µg/L 60% of the EPA limit 60 µg/L Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 39.387999999999984 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Dichloroacetic Acid | 21.4545 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 23.70799999999999 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Barium | 21.365 µg/L 1.1% of the EPA limit 2000 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 16.399999999999995 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019 | 3/4 | SYR4 |
| Bromodichloromethane | 15.783 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 16.150000000000002 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Monochloroacetic Acid | 6.018999999999999 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 9 µg/L — NIAGARA COUNTY WATER DISTRICT · 0 people · 2013 | 3/4 | SYR4 |
| Dibromochloromethane | 6.4715 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 6.569999999999999 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 2.3779999999999997 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019
Highest in the city: 4.8785 µg/L — LEWISTON VILLAGE · 2,781 people · 2019 | 3/4 | SYR4 |
| Bromoform | 1.6434999999999997 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019 | 3/4 | SYR4 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2019 | 2/4 | SYR4 |
| Arsenic | 0.8900 µg/L 8.9% of the EPA limit 10 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 0.1200 pCi/L 2.4% of the EPA limit 5 pCi/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2014 | 1/4 | SYR4 |
| Combined Uranium | 0.0360 µg/L 0.1% of the EPA limit 30 µg/L Highest in the city: NIAGARA COUNTY WATER DISTRICT · 0 people · 2014 | 1/4 | SYR4 |
| Pfba | 0.0130 µg/L No EPA limit set Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: LEWISTON WATER IMPROVEMENTAREA · 16,257 people · 2023 | 3/4 | 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 Lewiston
| Supplier | Population served |
|---|---|
| LEWISTON WATER IMPROVEMENTAREA | 16,257 |
| LEWISTON VILLAGE | 2,781 |
| NIAGARA COUNTY WATER DISTRICT | 0 |
| NIAGARA COUNTY WATER DISTRICT | 0 |
Frequently asked questions about Lewiston tap water
Is Lewiston tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Lewiston. 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 Lewiston?
4 public water suppliers report drinking-water monitoring for Lewiston, New York to the EPA. Each is listed above with its population served.
What contaminants are in Lewiston's water?
The contaminants EPA monitoring detected in Lewiston include Fluoride, Nitrate, Nitrate-Nitrite, TTHM, 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.