What was found in North Hempstead's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 14500 µg/L 145% of the EPA limit, in the worst sample — 10000 µg/L | 8/8 | SYR4 |
| Nitrate-Nitrite | 14500 µg/L 145% of the EPA limit, in the worst sample — 10000 µg/L | 8/8 | SYR4 |
| Nitrite | 2800 µg/L 280% of the EPA limit, in the worst sample — 1000 µg/L | 4/8 | SYR4 |
| Copper | 900 µg/L 69% of the EPA limit 1300 µg/L | 8/8 | SYR4 |
| Barium | 660 µg/L 33% of the EPA limit 2000 µg/L | 8/8 | SYR4 |
| Fluoride | 260 µg/L 6.5% of the EPA limit 4000 µg/L | 7/8 | SYR4 |
| TTHM | 59 µg/L 74% of the EPA limit 80 µg/L | 6/8 | SYR4 |
| cis-1,2-Dichloroethylene | 33.3 µg/L 48% of the EPA limit 70 µg/L | 5/8 | SYR4 |
| 1,1-Dichloroethylene | 26.9 µg/L 384% of the EPA limit, in the worst sample — 7 µg/L | 7/8 | SYR4 |
| Tetrachloroethylene | 20 µg/L 400% of the EPA limit, in the worst sample — 5 µg/L | 7/8 | SYR4 |
| Arsenic | 18 µg/L 180% of the EPA limit, in the worst sample — 10 µg/L | 1/8 | SYR4 |
| Trichloroethylene | 17 µg/L 340% of the EPA limit, in the worst sample — 5 µg/L | 7/8 | SYR4 |
| Cyanide | 16.8 µg/L 8.4% of the EPA limit 200 µg/L | 1/8 | SYR4 |
| Lead | 11.4 µg/L 76% of the EPA limit 15 µg/L | 8/8 | SYR4 |
| Toluene | 11.3 µg/L 1.1% of the EPA limit 1000 µg/L | 4/8 | SYR4 |
| Bromoform | 10.9 µg/L No EPA limit set | 6/8 | SYR4 |
| Beryllium, Total | 10 µg/L 250% of the EPA limit, in the worst sample — 4 µg/L | 2/8 | SYR4 |
| Combined Radium (-226 And -228) | 9.696 pCi/L 194% of the EPA limit, in the worst sample — 5 pCi/L | 8/8 | SYR4 |
| Combined Uranium | 9.3274 µg/L 31% of the EPA limit 30 µg/L | 8/8 | SYR4 |
| Carbon Tetrachloride | 7.2 µg/L 144% of the EPA limit, in the worst sample — 5 µg/L | 4/8 | SYR4 |
| Dibromochloromethane | 6.9 µg/L No EPA limit set | 5/8 | SYR4 |
| Gross Beta Particle Activity | 6.82 pCi/L No EPA limit set | 8/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.3 pCi/L 42% of the EPA limit 15 pCi/L | 6/8 | SYR4 |
| Selenium | 6 µg/L 12% of the EPA limit 50 µg/L | 5/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.9 µg/L 9.8% of the EPA limit 60 µg/L | 3/8 | SYR4 |
| 1,1,1-Trichloroethane | 4.1 µg/L 2.1% of the EPA limit 200 µg/L | 7/8 | SYR4 |
| Dibromoacetic Acid | 3.7 µg/L No EPA limit set | 3/8 | SYR4 |
| Chloroform | 3.5 µg/L No EPA limit set | 6/8 | SYR4 |
| Chromium | 3.4 µg/L 3.4% of the EPA limit 100 µg/L | 2/8 | SYR4 |
| 1,1,2-Trichloroethane | 3 µg/L 60% of the EPA limit 5 µg/L | 4/8 | SYR4 |
| Bromodichloromethane | 3 µg/L No EPA limit set | 5/8 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set | 1/8 | SYR4 |
| Trichloroacetic Acid | 3 µg/L No EPA limit set | 1/8 | SYR4 |
| 2,4-D | 2.6 µg/L 3.7% of the EPA limit 70 µg/L | 1/8 | SYR4 |
| Vinyl Chloride | 2.5 µg/L 125% of the EPA limit, in the worst sample — 2 µg/L | 2/8 | SYR4 |
| Thallium, Total | 1.89 µg/L 95% of the EPA limit 2 µg/L | 2/8 | SYR4 |
| Chlorobenzene | 1.8 µg/L 1.8% of the EPA limit 100 µg/L | 1/8 | SYR4 |
| Cadmium | 1.62 µg/L 32% of the EPA limit 5 µg/L | 2/8 | SYR4 |
| Antimony, Total | 1.42 µg/L 24% of the EPA limit 6 µg/L | 2/8 | SYR4 |
| 1,2-Dichloroethane | 1.4 µg/L 28% of the EPA limit 5 µg/L | 3/8 | SYR4 |
| Dichloroacetic Acid | 1.1 µg/L No EPA limit set | 1/8 | SYR4 |
| P-Dichlorobenzene | 0.8700 µg/L 1.2% of the EPA limit 75 µg/L | 1/8 | SYR4 |
| Chlordane | 0.8500 µg/L 43% of the EPA limit 2 µg/L | 2/8 | SYR4 |
| Dichloromethane | 0.8400 µg/L 17% of the EPA limit 5 µg/L | 2/8 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7600 µg/L 13% of the EPA limit 6 µg/L | 4/8 | SYR4 |
| Mercury | 0.5900 µg/L 30% of the EPA limit 2 µg/L | 1/8 | SYR4 |
| trans-1,2-Dichloroethylene | 0.5900 µg/L 0.6% of the EPA limit 100 µg/L | 1/8 | SYR4 |
| Pentachlorophenol | 0.1200 µg/L 12% of the EPA limit 1 µg/L | 2/8 | SYR4 |
| Heptachlor Epoxide | 0.1000 µg/L 50% of the EPA limit 0.2000 µg/L | 3/8 | SYR4 |
| Endrin | 0.0630 µg/L 3.2% of the EPA limit 2 µg/L | 1/8 | SYR4 |
| Ethylene Dibromide | 0.0510 µg/L 102% of the EPA limit, in the worst sample — 0.0500 µg/L | 3/8 | SYR4 |
| PFNA | 0.0190 µg/L No EPA limit set | 3/8 | UCMR-5 |
| PFOA | 0.0120 µg/L No EPA limit set | 5/8 | UCMR-5 |
| Pfpea | 0.0095 µg/L No EPA limit set | 5/8 | UCMR-5 |
| Lead | 0.0077 mg/L 51% of the EPA limit 0.0150 mg/L | 8/8 | LCR |
| Pfhxa | 0.0074 µg/L No EPA limit set | 5/8 | UCMR-5 |
| Pfba | 0.0071 µg/L No EPA limit set | 2/8 | UCMR-5 |
| PFOS | 0.0069 µg/L No EPA limit set | 3/8 | UCMR-5 |
| 6:2 Fts | 0.0065 µg/L No EPA limit set | 1/8 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set | 2/8 | UCMR-5 |
| PFBS | 0.0036 µg/L No EPA limit set | 1/8 | UCMR-5 |
| Pfhpa | 0.0034 µg/L No EPA limit set | 2/8 | UCMR-5 |
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 single worst sample on
record — 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 North Hempstead
| Supplier | Population served |
|---|---|
| WA OF WESTERN NASSAU | 120,000 |
| MANHASSET LAKEVILLE WD | 43,000 |
| PORT WASHINGTON WD | 34,000 |
| WA OF GREAT NECK NORTH | 31,400 |
| WESTBURY WD | 20,500 |
| ALBERTSON WD | 13,500 |
| CARLE PLACE WD | 9,005 |
| SANDS POINT (V) | 2,900 |
Frequently asked questions about North Hempstead tap water
Is North Hempstead tap water safe to drink?
EPA testing detected 62 contaminants in the water serving North Hempstead. 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 North Hempstead?
8 public water suppliers report drinking-water monitoring for North Hempstead, New York to the EPA. Each is listed above with its population served.
What contaminants are in North Hempstead's water?
The contaminants EPA monitoring detected in North Hempstead include Nitrate, Nitrate-Nitrite, Nitrite, Copper, Barium. The full list, with the highest level found 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.