What was found in ZIP 11023
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 8470 µg/L 85% of the EPA limit 10000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Nitrate | 8290 µg/L 83% of the EPA limit 10000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Nitrite | 2382 µg/L 238% of the EPA limit, at the 95th percentile of samples — 1000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 2473 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Fluoride | 173 µg/L 4.3% of the EPA limit 4000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 220 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Copper | 99.95 µg/L 7.7% of the EPA limit 1300 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Barium | 36.63 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 66.33 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Arsenic | 17.6 µg/L 176% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| Cyanide | 16.8 µg/L 8.4% of the EPA limit 200 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 4.035 µg/L 81% of the EPA limit 5 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 14.68 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| cis-1,2-Dichloroethylene | 12.46 µg/L 18% of the EPA limit 70 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Beryllium, Total | 10 µg/L 250% of the EPA limit, at the 95th percentile of samples — 4 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 8.8544 pCi/L 177% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| TTHM | 1.816 µg/L 2.3% of the EPA limit 80 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 8.388 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Lead | 8.242 µg/L 55% of the EPA limit 15 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 7.5 µg/L 150% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Selenium | 2.9575 µg/L 5.9% of the EPA limit 50 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 5.815 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 5.45713 µg/L 18% of the EPA limit 30 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Bromoform | 2.22 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 5.399 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 4.993 pCi/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 0.7900 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 2.796 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Chromium | 2.725 µg/L 2.7% of the EPA limit 100 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 0.5000 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 1.9745 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.903 pCi/L 13% of the EPA limit 15 pCi/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.8 µg/L 3% of the EPA limit 60 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.795 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 1.5 µg/L 21% of the EPA limit 7 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Toluene | 0.6300 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 1.325 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| 1,1,1-Trichloroethane | 1.31 µg/L 0.7% of the EPA limit 200 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Vinyl Chloride | 1.1 µg/L 55% of the EPA limit 2 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| Chloroform | 0.9520 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Carbon Tetrachloride | 0.5950 µg/L 12% of the EPA limit 5 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019
Highest in the ZIP: 0.8790 µg/L — WA OF GREAT NECK NORTH · 31,400 people · 2019 | 2/2 | SYR4 |
| Antimony, Total | 0.8700 µg/L 14% of the EPA limit 6 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7300 µg/L 12% of the EPA limit 6 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2018 | 2/2 | SYR4 |
| 1,1,2-Trichloroethane | 0.6990 µg/L 14% of the EPA limit 5 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 2/2 | SYR4 |
| Mercury | 0.5900 µg/L 30% of the EPA limit 2 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| 1,2-Dichloroethane | 0.5100 µg/L 10% of the EPA limit 5 µg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2019 | 1/2 | SYR4 |
| Chlordane | 0.2100 µg/L 11% of the EPA limit 2 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| Heptachlor Epoxide | 0.0273 µg/L 14% of the EPA limit 0.2000 µg/L Highest in the ZIP: WA OF GREAT NECK NORTH · 31,400 people · 2019 | 1/2 | SYR4 |
| PFNA | 0.0190 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0074 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0053 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2025 | 1/2 | UCMR-5 |
| Pfba | 0.0052 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0039 µg/L No EPA limit set Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: MANHASSET LAKEVILLE WD · 43,000 people · 2023
Highest in the ZIP: 0.0030 mg/L — WA OF GREAT NECK NORTH · 31,400 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.
Water suppliers serving ZIP 11023
| Supplier | State | Population served |
|---|---|---|
| MANHASSET LAKEVILLE WD | NY | 43,000 |
| WA OF GREAT NECK NORTH | NY | 31,400 |
Frequently asked questions about ZIP 11023 tap water
Is the tap water in ZIP 11023 safe to drink?
EPA testing detected 44 contaminants across the water suppliers serving ZIP 11023. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 11023?
2 public water suppliers report EPA drinking-water monitoring for ZIP 11023. Each is listed above with its population served.
What contaminants are in ZIP 11023's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Nitrite, Fluoride, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.