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Community Water System · PWS NY2902831

Jericho WD

Syosset, New York 11791 - drinking water served from groundwater sources to 58,000 people, tracked in EPA SDWIS and UCMR5.

58,000
People served
373
EPA violations
9
Health-based
5 PFAS
UCMR5 result

The verdict

EPA records 373 drinking-water violations at Jericho WD, 2% of them health-based - above the New York per-system average, and UCMR5 testing detected 5 PFAS compounds.

373
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
58,000
People served by this system
5
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Jericho WD

Jericho WD is a public/private-owned community water system that delivers drinking water to 58,000 residents in Syosset, New York (Nassau County) through 18,466 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 373 total violations for this system , of which 9 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 364 monitoring and reporting violations are on file. The most recent violation on record dates to 2013.

The most frequently cited contaminant at this system is Atrazine, recorded in 16 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 5 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 67 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%).

Jericho WD's 373 violations sit above 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

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

Population Served
58,000
Total Violations
373
Health-Based Violations
9
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Public/Private
Connections
18,466
County
Nassau
School/Daycare
No
MCL Violations
9
Monitoring Violations
364
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Atrazine MR 16 2013
Simazine MR 16 2013
Nitrate MR 12 2010
BHC-GAMMA MR 12 2013
Methoxychlor MR 12 2013
Toxaphene MR 12 2013
Dalapon MR 12 2013
Di(2-ethylhexyl) adipate MR 12 2013
Picloram MR 12 2013
Dinoseb MR 12 2013
Hexachlorocyclopentadiene MR 12 2013
Aldicarb sulfoxide MR 12 2013
Aldicarb sulfone MR 12 2013
Carbofuran MR 12 2013
Aldicarb MR 12 2013
Heptachlor epoxide MR 12 2013
2,4-D MR 12 2013
2,4,5-TP MR 12 2013
HEXACHLOROBENZENE MR 12 2013
Benzo(a)pyrene MR 12 2013
Total Polychlorinated Biphenyls (PCB) MR 12 2013
ETHYLENE DIBROMIDE MR 12 2013
Chlordane MR 12 2013
Di(2-ethylhexyl) phthalate MR 12 2013
Endrin MR 12 2013
LASSO MR 12 2013
Pentachlorophenol MR 12 2013
Heptachlor MR 12 2013
OXAMYL MR 12 2013
Coliform (TCR) MCL 9 1999

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 28 of 935 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/1/2023 <2.00 ppt 2.00 ppt Not Detected
PFHpS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/1/2023 <20.00 ppt 20.00 ppt Not Detected
PFEESA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/1/2023 5.30 ppt 3.00 ppt Detected
PFMPA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/1/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 9/1/2023 3.40 ppt 3.00 ppt Detected
PFDA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFDoA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/1/2023 <20.00 ppt 20.00 ppt Not Detected
PFUnA 9/1/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/1/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/1/2023 7.60 ppt 5.00 ppt Detected
6:2 FTS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/1/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/1/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 9/1/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/1/2023 <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 Jericho WD.

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 NY2902831 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 Jericho WD under EPA-delegated authority.

Open NY regulator portal

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

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2013 Atrazine MR 16 SDWIS / NY2902831 / 2050
2013 Simazine MR 16 SDWIS / NY2902831 / 2037
2013 BHC-GAMMA MR 12 SDWIS / NY2902831 / 2010
2013 Methoxychlor MR 12 SDWIS / NY2902831 / 2015
2013 Toxaphene MR 12 SDWIS / NY2902831 / 2020
2013 Dalapon MR 12 SDWIS / NY2902831 / 2031
2013 Di(2-ethylhexyl) adipate MR 12 SDWIS / NY2902831 / 2035
2013 Picloram MR 12 SDWIS / NY2902831 / 2040
2013 Dinoseb MR 12 SDWIS / NY2902831 / 2041
2013 Hexachlorocyclopentadiene MR 12 SDWIS / NY2902831 / 2042
2013 Aldicarb sulfoxide MR 12 SDWIS / NY2902831 / 2043
2013 Aldicarb sulfone MR 12 SDWIS / NY2902831 / 2044
2013 Carbofuran MR 12 SDWIS / NY2902831 / 2046
2013 Aldicarb MR 12 SDWIS / NY2902831 / 2047
2013 Heptachlor epoxide MR 12 SDWIS / NY2902831 / 2067

How Jericho WD Compares

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

Metric Jericho WD New York avg Federal benchmark
Total violations 373 68.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 3.3 Indicates a contaminant exceeded a federal MCL
PFAS detection 5 compounds 38.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 58,000 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 Jericho WD water safe to drink? ▼
Jericho WD (PWS ID: NY2902831) has 373 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 5 PFAS compounds found. This system serves 58,000 people using Groundwater sources.
How many people does Jericho WD serve? ▼
Jericho WD serves 58,000 people in Syosset, New York. It is a Public/Private-owned system using Groundwater water sources with 18,466 service connections.
What type of violations does Jericho WD have? ▼
Jericho WD has 373 total violations: 9 health-based violations (MCL exceedances or treatment failures), 364 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Jericho WD water? ▼
Yes. UCMR5 testing detected 5 PFAS compounds in Jericho WD's water supply: PFPeA, PFHxA, PFBA, PFHpA, 6:2 FTS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Jericho WD use? ▼
Jericho WD 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.