What was found in Lewisboro'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 | 350 µg/L 3.5% of the EPA limit 10000 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 3820 µg/L — FOREST PARK WATER CO PLANT #3 · 67 people · 2019 | 14/15 | SYR4 |
| Nitrate-Nitrite | 350 µg/L 3.5% of the EPA limit 10000 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 3226 µg/L — KEELER FIELD · 100 people · 2019 | 13/15 | SYR4 |
| Fluoride | 807 µg/L 20% of the EPA limit 4000 µg/L Highest in the city: MEADOWS AT CROSS RIVER · 630 people · 2019 | 4/15 | SYR4 |
| Barium | 34.945 µg/L 1.7% of the EPA limit 2000 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2018
Highest in the city: 402.5 µg/L — MEADOWS AT CROSS RIVER · 630 people · 2019 | 14/15 | SYR4 |
| Cyanide | 165 µg/L 83% of the EPA limit 200 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2018 | 4/15 | SYR4 |
| TTHM | 105.78 µg/L 132% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 14/15 | SYR4 |
| Combined Uranium | 16.4004 µg/L 55% of the EPA limit 30 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 55.4705 µg/L — TWIN LAKES WATER CO., INC. · 366 people · 2017 | 14/15 | SYR4 |
| Chloroform | 40.39 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 44.3 µg/L — ARBOR HILLS WATER WORKS · 180 people · 2019 | 14/15 | SYR4 |
| Copper | 39.005 µg/L 3% of the EPA limit 1300 µg/L Highest in the city: TWIN LAKES WATER CO., INC. · 366 people · 2016 | 2/15 | SYR4 |
| Dibromochloromethane | 38.35 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 14/15 | SYR4 |
| Total Haloacetic Acids (HAA5) | 36.0485 µg/L 60% of the EPA limit 60 µg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 14/15 | SYR4 |
| Gross Alpha, Excl. Radon And U | 19.9 pCi/L 133% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 31 pCi/L — ARBOR HILLS WATER WORKS · 180 people · 2019 | 11/15 | SYR4 |
| Bromoform | 30.4 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 14/15 | SYR4 |
| Bromodichloromethane | 30.09 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 14/15 | SYR4 |
| Gross Beta Particle Activity | 8.436 pCi/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 19.375 pCi/L — ARBOR HILLS WATER WORKS · 180 people · 2019 | 8/15 | SYR4 |
| Trichloroacetic Acid | 16.405 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 19.25 µg/L — WILD OAKS WATER COMPANY · 805 people · 2019 | 9/15 | SYR4 |
| Dichloroacetic Acid | 13.39 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 17 µg/L — WILD OAKS WATER COMPANY · 805 people · 2019 | 11/15 | SYR4 |
| Dibromoacetic Acid | 13.28 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 13/15 | SYR4 |
| Combined Radium (-226 And -228) | 3.976 pCi/L 80% of the EPA limit 5 pCi/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019
Highest in the city: 11.265 pCi/L — ARBOR HILLS WATER WORKS · 180 people · 2019 | 9/15 | SYR4 |
| Chromium | 7.866 µg/L 7.9% of the EPA limit 100 µg/L Highest in the city: TWIN LAKES WATER CO., INC. · 366 people · 2018 | 3/15 | SYR4 |
| Lead | 5.2 µg/L 35% of the EPA limit 15 µg/L Highest in the city: TWIN LAKES WATER CO., INC. · 366 people · 2016 | 1/15 | SYR4 |
| Monobromoacetic Acid | 4.152 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 3/15 | SYR4 |
| Monochloroacetic Acid | 4.004 µg/L No EPA limit set Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2019 | 3/15 | SYR4 |
| Toluene | 3.2 µg/L 0.3% of the EPA limit 1000 µg/L Highest in the city: MEADOWS AT CROSS RIVER · 630 people · 2019 | 2/15 | SYR4 |
| Selenium | 2.04 µg/L 4.1% of the EPA limit 50 µg/L Highest in the city: MEADOWS AT CROSS RIVER · 630 people · 2019 | 1/15 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: MEADOWS AT CROSS RIVER · 630 people · 2019 | 2/15 | SYR4 |
| Toxaphene | 1 µg/L 33% of the EPA limit 3 µg/L Highest in the city: HUNT FARM WATER COMPANY · 156 people · 2019 | 1/15 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8700 µg/L 14% of the EPA limit 6 µg/L Highest in the city: INDIAN HILL SUBDIVISION · 320 people · 2019 | 1/15 | SYR4 |
| Mercury | 0.2640 µg/L 13% of the EPA limit 2 µg/L Highest in the city: WILD OAKS WATER COMPANY · 805 people · 2019 | 1/15 | SYR4 |
| Ethylene Dibromide | 0.1100 µg/L 220% of the EPA limit, at the 95th percentile of samples — 0.0500 µg/L Highest in the city: INDIAN HILL SUBDIVISION · 320 people · 2019 | 1/15 | SYR4 |
| Lead | 0.0616 mg/L 411% above the EPA limit of 0.0150 mg/L Main supplier: OAKRIDGE WATER DISTRICT · 892 people · 2026 | 15/15 | 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 Lewisboro
| Supplier | Population served |
|---|---|
| OAKRIDGE WATER DISTRICT | 892 |
| WILD OAKS WATER COMPANY | 805 |
| MEADOWS AT CROSS RIVER | 630 |
| TRUESDALE CORPORATION | 400 |
| TWIN LAKES WATER CO., INC. | 366 |
| LAKE KATONAH CLUB INC | 356 |
| MICHELLE ESTATES | 340 |
| INDIAN HILL SUBDIVISION | 320 |
| GOLDENS BRIDGE COMMUNITY ASSOC | 250 |
| ARBOR HILLS WATER WORKS | 180 |
| LEWISBORO COMMONS | 168 |
| HUNT FARM WATER COMPANY | 156 |
| KEELER FIELD | 100 |
| FOREST PARK WATER CO PLANT #3 | 67 |
| WACCABUC FARMS INC. | 26 |
Frequently asked questions about Lewisboro tap water
Is Lewisboro tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Lewisboro. 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 Lewisboro?
15 public water suppliers report drinking-water monitoring for Lewisboro, New York to the EPA. Each is listed above with its population served.
What contaminants are in Lewisboro's water?
The contaminants EPA monitoring detected in Lewisboro include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Cyanide. 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.