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Tap water quality report

Locust Valley Wd

EPA monitoring tested this supplier for 112 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

112
contaminants tested
19
detected
7,500
people served
6
health-based violations
New York rankingsLead in New YorkPFAS in New York
Water source
Ground water
Ownership
Mixed public/private
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.

6
health-based violations
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2004-07-01 → 2004-07-31
MCL Health-based Resolved 2004-07-01 → 2004-07-31
MCL Health-based Resolved 2004-07-01 → 2004-07-31
MCL Health-based Resolved 2004-07-01 → 2004-07-31
MCL Health-based Resolved 2001-12-01 → 2001-12-31
MCL Health-based Resolved 2001-12-01 → 2001-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFNA 0.0296 µg/L 2/10 2024
PFHXS 0.0045 µg/L 1/10 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
Nitrate
5000 µg/L 50%
of the EPA limit 10000 µg/L
worst single sample: 5600 µg/L
118/118 SYR4 2012–2019
Tetrachloroethylene
5.885 µg/L 118%
of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 10.1 µg/L
96/243 SYR4 2012–2019
Trichloroethylene
2.14 µg/L 43%
of the EPA limit 5 µg/L
worst single sample: 2.96 µg/L
77/243 SYR4 2012–2019
cis-1,2-Dichloroethylene
4.49 µg/L 6.4%
of the EPA limit 70 µg/L
worst single sample: 5.77 µg/L
63/243 SYR4 2012–2019
Barium
84.1 µg/L 4.2%
of the EPA limit 2000 µg/L
worst single sample: 91 µg/L
40/46 SYR4 2012–2019
Copper
161.675 µg/L 12%
of the EPA limit 1300 µg/L
worst single sample: 340 µg/L
26/38 SYR4 2012–2019
Nitrate-Nitrite
4784 µg/L 48%
of the EPA limit 10000 µg/L
worst single sample: 4870 µg/L
24/28 SYR4 2012–2019
Gross Beta Particle Activity
2.5875 pCi/L
No EPA limit set
worst single sample: 2.7 pCi/L
10/10 SYR4 2014–2017
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2023
Combined Uranium
5.27414 µg/L 18%
of the EPA limit 30 µg/L
worst single sample: 6.1537 µg/L
4/13 SYR4 2013–2017
Lead
16.556 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 18.8 µg/L
4/22 SYR4 2012–2015
1,1-Dichloroethylene
0.7000 µg/L 10%
of the EPA limit 7 µg/L
 1/244 SYR4 2012–2019
1,2-Dichloroethane
0.6000 µg/L 12%
of the EPA limit 5 µg/L
 1/244 SYR4 2012–2019
Bromodichloromethane
0.8500 µg/L
No EPA limit set
 1/33 SYR4 2014–2019
Chloroform
0.7200 µg/L
No EPA limit set
 1/33 SYR4 2014–2019
Dibromochloromethane
0.7200 µg/L
No EPA limit set
 1/33 SYR4 2014–2019
Fluoride
100 µg/L 2.5%
of the EPA limit 4000 µg/L
 1/47 SYR4 2012–2019
93 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidVinyl ChlorideLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
PETTI, ANDREW
Phone
516-671-1783
Email
[email protected]

Frequently asked questions about Locust Valley Wd

Is Locust Valley Wd tap water safe to drink?

EPA monitoring detected 19 contaminants in Locust Valley Wd'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 Locust Valley Wd's water?

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

How many people does Locust Valley Wd serve?

Locust Valley Wd reports serving 7,500 people in New York, per its EPA record.

Has Locust Valley Wd had any water quality violations?

The EPA has 6 violations on file for Locust Valley Wd, of which 6 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.