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Community Water System · PWS NY0900215

Lyon Mountain Water Dist

New York - drinking water served from groundwater sources to 750 people, tracked in EPA SDWIS and UCMR5.

750
People served
435
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 435 drinking-water violations at Lyon Mountain Water Dist, 3% of them health-based - above the New York per-system average.

435
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
750
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lyon Mountain Water Dist

Lyon Mountain Water Dist is a local-owned community water system that delivers drinking water to 750 residents in New York (Clinton County) through 252 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 435 total violations for this system , of which 11 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 396 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 57 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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%).

Lyon Mountain Water Dist's 435 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.

Population Served
750
Total Violations
435
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
252
County
Clinton
School/Daycare
No
MCL Violations
1
Monitoring Violations
396
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 57 2004
Nitrate MR 20 2013
Surface Water Treatment Rule TT 10 1994
cis-1,2-Dichloroethylene MR 8 2002
Vinyl chloride MR 8 2002
p-Dichlorobenzene MR 8 2002
o-Dichlorobenzene MR 8 2002
DICHLOROMETHANE MR 8 2002
Ethylbenzene MR 8 2002
Benzene MR 8 2002
Tetrachloroethylene MR 8 2002
1,1,2-Trichloroethane MR 8 2002
Styrene MR 8 2002
Toluene MR 8 2002
Trichloroethylene MR 8 2002
1,2-Dichloropropane MR 8 2002
Carbon tetrachloride MR 8 2002
1,1,1-Trichloroethane MR 8 2002
1,2-Dichloroethane MR 8 2002
1,1-Dichloroethylene MR 8 2002
trans-1,2-Dichloroethylene MR 8 2002
CHLOROBENZENE MR 8 2002
1,2,4-Trichlorobenzene MR 8 2002
Lead and Copper Rule MR 7 2003
2,4,5-TP MR 6 2000
Toxaphene MR 6 2000
Methoxychlor MR 6 2000
BHC-GAMMA MR 6 2000
Endrin MR 6 2000
2,4-D MR 6 2000

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 Lyon Mountain Water Dist.

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 NY0900215 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 Lyon Mountain Water Dist 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
2016 Total Haloacetic Acids (HAA5) MR 5 SDWIS / NY0900215 / 2456
2016 TTHM MR 5 SDWIS / NY0900215 / 2950
2013 Nitrate MR 20 SDWIS / NY0900215 / 1040
2004 Coliform (TCR) MR 57 SDWIS / NY0900215 / 3100
2003 Lead and Copper Rule MR 7 SDWIS / NY0900215 / 5000
2002 cis-1,2-Dichloroethylene MR 8 SDWIS / NY0900215 / 2380
2002 Vinyl chloride MR 8 SDWIS / NY0900215 / 2976
2002 p-Dichlorobenzene MR 8 SDWIS / NY0900215 / 2969
2002 o-Dichlorobenzene MR 8 SDWIS / NY0900215 / 2968
2002 DICHLOROMETHANE MR 8 SDWIS / NY0900215 / 2964
2002 Ethylbenzene MR 8 SDWIS / NY0900215 / 2992
2002 Benzene MR 8 SDWIS / NY0900215 / 2990
2002 Tetrachloroethylene MR 8 SDWIS / NY0900215 / 2987
2002 1,1,2-Trichloroethane MR 8 SDWIS / NY0900215 / 2985
2002 Styrene MR 8 SDWIS / NY0900215 / 2996

How Lyon Mountain Water Dist Compares

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

Metric Lyon Mountain Water Dist New York avg Federal benchmark
Total violations 435 68.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 3.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 38.9% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 750 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 Lyon Mountain Water Dist water safe to drink? ▼
Lyon Mountain Water Dist (PWS ID: NY0900215) has 435 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 750 people using Groundwater sources.
How many people does Lyon Mountain Water Dist serve? ▼
Lyon Mountain Water Dist serves 750 people in New York. It is a Local-owned system using Groundwater water sources with 252 service connections.
What type of violations does Lyon Mountain Water Dist have? ▼
Lyon Mountain Water Dist has 435 total violations: 11 health-based violations (MCL exceedances or treatment failures), 396 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lyon Mountain Water Dist water? ▼
No PFAS testing data is available for Lyon Mountain Water Dist under the EPA's UCMR5 monitoring program.
What water source does Lyon Mountain Water Dist use? ▼
Lyon Mountain Water Dist 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. 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.