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Community Water System · PWS NY2900000

Town of Hempstead Water Department

East Meadow, New York 11554 - drinking water served from groundwater sources to 110,000 people, tracked in EPA SDWIS and UCMR5.

110,000
People served
2
EPA violations
0
Health-based
1 PFAS
UCMR5 result

The verdict

EPA records 2 drinking-water violations at Town of Hempstead Water Department - below the New York per-system average, and UCMR5 testing detected 1 PFAS compound.

2
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
110,000
People served by this system
1
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Town of Hempstead Water Department

Town of Hempstead Water Department is a local-owned community water system that delivers drinking water to 110,000 residents in East Meadow, New York (Nassau County) through 34,956 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 2 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed.

No specific contaminant violations have been recorded in EPA's detailed violation register for this system. Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 4.2 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across New York, EPA tracks 8,098 public water systems serving 19,294,951 people, with 552,003 cumulative violations and 26,817 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 68.2 violations. Statewide, 129 of 332 UCMR5-tested systems have reported PFAS detections (38.9%).

Town of Hempstead Water Department's 2 violations sit below the New York average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
110,000
Total Violations
2
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
34,956
County
Nassau
School/Daycare
No
MCL Violations
0
Monitoring Violations
0
Treatment Tech Violations
0

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 2 of 754 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 7/13/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 7/13/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 7/13/2023 <6.00 ppt 6.00 ppt Not Detected
PFBA 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 7/13/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 7/13/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 7/13/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 7/13/2023 <6.00 ppt 6.00 ppt Not Detected
NEtFOSAA 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 7/13/2023 <8.00 ppt 8.00 ppt Not Detected
PFPeS 7/13/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 7/13/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 7/13/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 7/13/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 7/13/2023 <7.00 ppt 7.00 ppt Not Detected
PFPeA 7/13/2023 <3.00 ppt 3.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Town of Hempstead Water Department.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NY2900000 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New York Drinking Water Authority

New York State Department of Health, Public Water Systems is the primacy agency that licenses and inspects Town of Hempstead Water Department under EPA-delegated authority.

Open NY regulator portal

Source: New York State Department of Health, Public Water Systems

How Town of Hempstead Water Department Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Town of Hempstead Water Department New York avg Federal benchmark
Total violations 2 68.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 3.3 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 38.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 110,000 2,383 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 8,098 regulated public water systems in New York.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Town of Hempstead Water Department water safe to drink? ▼
Town of Hempstead Water Department (PWS ID: NY2900000) has 2 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 110,000 people using Groundwater sources.
How many people does Town of Hempstead Water Department serve? ▼
Town of Hempstead Water Department serves 110,000 people in East Meadow, New York. It is a Local-owned system using Groundwater water sources with 34,956 service connections.
What type of violations does Town of Hempstead Water Department have? ▼
Town of Hempstead Water Department has 2 total violations: 0 health-based violations (MCL exceedances or treatment failures), 0 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Town of Hempstead Water Department water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in Town of Hempstead Water Department's water supply: PFPeA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Town of Hempstead Water Department use? ▼
Town of Hempstead Water Department uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.