WA OF WESTERN NASSAU
NY · PWS ID NY2902830 · Community water system
112
contaminants tested
48
detected
120,000
people served
PFAS detected
“Forever chemicals” from UCMR-5 — the only fresh nationwide measurements (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| PFHxA | 0.0074 ug/L | 6/26 | 2024 |
| PFPeA | 0.0095 ug/L | 6/26 | 2024 |
| PFHpA | 0.0034 ug/L | 5/26 | 2024 |
| PFOA | 0.0100 ug/L | 5/26 | 2024 |
| PFBA | 0.0071 ug/L | 4/26 | 2024 |
| PFBS | 0.0036 ug/L | 3/26 | 2024 |
| PFHxS | 0.0045 ug/L | 2/26 | 2024 |
| PFOS | 0.0061 ug/L | 2/26 | 2024 |
Other contaminants detected
| Contaminant | Max | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 7560 UG/L | 800/846 | SYR4 | 2012–2019 |
| Trichloroethylene | 17 UG/L | 514/1508 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 20 UG/L | 453/1394 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 6500 UG/L | 259/282 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 33.3 UG/L | 230/1690 | SYR4 | 2012–2019 |
| 1,1-Dichloroethylene | 26.9 UG/L | 204/1690 | SYR4 | 2012–2019 |
| 1,1,1-Trichloroethane | 2.13 UG/L | 176/1691 | SYR4 | 2012–2019 |
| Barium | 78.3 UG/L | 160/199 | SYR4 | 2012–2019 |
| Vinyl chloride | 2.5 UG/L | 140/1691 | SYR4 | 2012–2019 |
| CHLOROBENZENE | 1.8 UG/L | 126/1691 | SYR4 | 2012–2019 |
| COPPER, FREE | 900 UG/L | 114/198 | SYR4 | 2012–2019 |
| Dibromochloromethane | 5 UG/L | 83/296 | SYR4 | 2012–2019 |
| Bromoform | 10.9 UG/L | 71/297 | SYR4 | 2012–2019 |
| Bromodichloromethane | 2.2 UG/L | 60/297 | SYR4 | 2012–2019 |
| TTHM | 15.3 UG/L | 60/273 | SYR4 | 2012–2019 |
| Combined Uranium | 9.3274 UG/L | 53/65 | SYR4 | 2012–2019 |
| Carbon tetrachloride | 7.2 UG/L | 49/1692 | SYR4 | 2012–2019 |
| p-Dichlorobenzene | 0.8700 UG/L | 48/1692 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 6.22 PCI/L | 45/47 | SYR4 | 2012–2019 |
| ETHYLENE DIBROMIDE | 0.0510 UG/L | 43/186 | SYR4 | 2012–2019 |
| Dibromoacetic acid | 3.7 UG/L | 40/71 | SYR4 | 2012–2018 |
| 1,2-Dichloroethane | 1.4 UG/L | 32/1692 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 5.9 UG/L | 32/47 | SYR4 | 2017–2018 |
| Combined Radium (-226 and -228) | 5.4 PCI/L | 31/65 | SYR4 | 2012–2019 |
| Heptachlor epoxide | 0.0470 UG/L | 31/136 | SYR4 | 2012–2019 |
| Lead | 11.4 UG/L | 23/198 | SYR4 | 2012–2019 |
| Chloroform | 3.5 UG/L | 13/297 | SYR4 | 2012–2019 |
| Selenium | 3.1 UG/L | 13/200 | SYR4 | 2012–2019 |
| LEAD SUMMARY | 0.0080 mg/L | 11/11 | LCR | 2024 |
| Gross Alpha, Excl. Radon and U | 2.26 PCI/L | 6/66 | SYR4 | 2012–2019 |
| Fluoride | 130 UG/L | 4/199 | SYR4 | 2012–2019 |
| DICHLOROMETHANE | 0.6500 UG/L | 2/1692 | SYR4 | 2012–2019 |
| Nitrite | 150 UG/L | 2/284 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 3 UG/L | 2/71 | SYR4 | 2012–2018 |
| Di(2-ethylhexyl) phthalate | 0.7600 UG/L | 1/99 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 1.1 UG/L | 1/71 | SYR4 | 2012–2018 |
| Endrin | 0.0630 UG/L | 1/99 | SYR4 | 2012–2019 |
| Monochloroacetic acid | 3 UG/L | 1/71 | SYR4 | 2012–2018 |
| Thallium, Total | 0.3400 UG/L | 1/200 | SYR4 | 2012–2019 |
| Toluene | 11.3 UG/L | 1/1692 | SYR4 | 2012–2019 |
64 contaminants tested, none detected
1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 FTS6:2 FTS8:2 FTS9Cl-PF3ONSADONAAntimony, TotalArsenicAtrazineBHC-GAMMABenzeneBenzo(a)pyreneBeryllium, TotalCYANIDECadmiumCarbofuranChlordaneChromiumDalaponDi(2-ethylhexyl) adipateDinosebDiquatEndothallEthylbenzeneGlyphosateHEXACHLOROBENZENEHFPO-DAHeptachlorHexachlorocyclopentadieneLASSOMercuryMethoxychlorMonobromoacetic acidNEtFOSAANFDHANMeFOSAAOXAMYLPFDAPFDoAPFEESAPFHpSPFMBAPFMPAPFNAPFPeSPFTAPFTrDAPFUnAPentachlorophenolPicloramSimazineStyreneTotal Polychlorinated Biphenyls (PCB)Toxaphenelithiumo-Dichlorobenzenetrans-1,2-Dichloroethylene
Areas served
HEMPSTEAD (T)NORTH HEMPSTEAD (T)