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Tap water quality report

Hempstead

EPA monitoring tested this supplier for 111 contaminants and detected 23. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
23
detected
56,000
people served
4
health-based violations
New York rankingsLead in New YorkPFAS in New York
Water source
Ground water
Ownership
Local government
Counties served
Nassau

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
229
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2007-05-01 → 2007-05-31
MCL Health-based Resolved 2007-05-01 → 2007-05-31
MCL Health-based Resolved 2007-05-01 → 2007-05-31
MCL Health-based Resolved 2007-05-01 → 2007-05-31
RPT Monitoring Resolved 2024-10-17
MR Monitoring Resolved 2016-01-01
MR Monitoring Resolved 2016-01-01
MR Monitoring Resolved 2016-01-01
MR Monitoring Resolved 2016-01-01
MR Monitoring Resolved 2012-10-01 → 2012-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFOS 0.0047 µg/L 1/4 2024

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Tetrachloroethylene
14.425 µg/L 289%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 19.7 µg/L
146/595 SYR4 2012–2019
Trichloroethylene
17.02 µg/L 340%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 19.6 µg/L
139/600 SYR4 2012–2019
cis-1,2-Dichloroethylene
4 µg/L 5.7%
of the EPA limit 70 µg/L
worst single sample: 5.8 µg/L
106/607 SYR4 2012–2019
Nitrate
1933 µg/L 19%
of the EPA limit 10000 µg/L
worst single sample: 2700 µg/L
80/152 SYR4 2012–2019
Barium
16 µg/L 0.8%
of the EPA limit 2000 µg/L
worst single sample: 18 µg/L
73/74 SYR4 2012–2019
1,1-Dichloroethylene
3.132 µg/L 45%
of the EPA limit 7 µg/L
worst single sample: 4.5 µg/L
70/607 SYR4 2012–2019
Copper
70.4 µg/L 5.4%
of the EPA limit 1300 µg/L
worst single sample: 577 µg/L
59/76 SYR4 2012–2019
Nitrate-Nitrite
1966 µg/L 20%
of the EPA limit 10000 µg/L
worst single sample: 2700 µg/L
39/74 SYR4 2012–2019
1,1,1-Trichloroethane
3.515 µg/L 1.8%
of the EPA limit 200 µg/L
worst single sample: 3.7 µg/L
38/607 SYR4 2012–2019
Lead
6.17 µg/L 41%
of the EPA limit 15 µg/L
worst single sample: 49.7 µg/L
27/73 SYR4 2012–2019
Vinyl Chloride
2.2 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 2 µg/L
worst single sample: 2.3 µg/L
26/607 SYR4 2012–2019
Combined Radium (-226 And -228)
4.158 pCi/L 83%
of the EPA limit 5 pCi/L
worst single sample: 4.28 pCi/L
25/36 SYR4 2013–2019
Combined Uranium
5.81353 µg/L 19%
of the EPA limit 30 µg/L
worst single sample: 6.0643 µg/L
22/34 SYR4 2013–2019
Gross Beta Particle Activity
4.47 pCi/L
No EPA limit set
worst single sample: 4.72 pCi/L
21/21 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2025
Thallium, Total
0.6320 µg/L 32%
of the EPA limit 2 µg/L
worst single sample: 0.7600 µg/L
9/73 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
5.587 pCi/L 37%
of the EPA limit 15 pCi/L
worst single sample: 6.1 pCi/L
7/38 SYR4 2013–2019
Benzene
0.6670 µg/L 13%
of the EPA limit 5 µg/L
worst single sample: 0.6700 µg/L
4/607 SYR4 2012–2019
1,1,2-Trichloroethane
1.1 µg/L 22%
of the EPA limit 5 µg/L
 1/607 SYR4 2012–2019
Arsenic
1.5 µg/L 15%
of the EPA limit 10 µg/L
 1/75 SYR4 2012–2019
Carbon Tetrachloride
0.5000 µg/L 10%
of the EPA limit 5 µg/L
 1/607 SYR4 2012–2019
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
 1/75 SYR4 2012–2019
88 contaminants tested, none detected
1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTTHMTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GIARDINO, STEVEN
Phone
516-478-6252
Email
[email protected]

Frequently asked questions about Hempstead

Is Hempstead tap water safe to drink?

EPA monitoring detected 23 contaminants in Hempstead's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Hempstead's water?

EPA monitoring detected Tetrachloroethylene, Trichloroethylene, cis-1,2-Dichloroethylene, Nitrate, Barium, and others. The full list with the level and data source for each is above.

How many people does Hempstead serve?

Hempstead reports serving 56,000 people in New York, per its EPA record.

Has Hempstead had any water quality violations?

The EPA has 229 violations on file for Hempstead, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.