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Community Water System · PWS NY0602924

Chautauqua Water District #2

Mayville, New York 14757 - drinking water served from surface water sources to 490 people, tracked in EPA SDWIS and UCMR5.

490
People served
327
EPA violations
123
Health-based
Untested
UCMR5 result

The verdict

EPA records 327 drinking-water violations at Chautauqua Water District #2, 38% of them health-based - above the New York per-system average.

327
Total EPA violations on record
38%
Health-based (MCL / treatment failure)
490
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Chautauqua Water District #2

Chautauqua Water District #2 is a private-owned community water system that delivers drinking water to 490 residents in Mayville, New York (Chautauqua County) through 172 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 327 total violations for this system , of which 123 (38%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 197 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Total Haloacetic Acids (HAA5), recorded in 47 violations (MCL, health-based). 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%).

Chautauqua Water District #2's 327 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
490
Total Violations
327
Health-Based Violations
123
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Private
Connections
172
County
Chautauqua
School/Daycare
No
MCL Violations
85
Monitoring Violations
197
Treatment Tech Violations
38

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Total Haloacetic Acids (HAA5) MCL 47 2019
TTHM MCL 38 2019
Interim Enhanced Surface Water Treatment Rule TT 38 2020
Total Haloacetic Acids (HAA5) MR 11 2016
TTHM MR 7 2016
Heptachlor epoxide MR 6 2023
2,4-D MR 6 2023
2,4,5-TP MR 6 2023
Pentachlorophenol MR 6 2023
Total Polychlorinated Biphenyls (PCB) MR 6 2023
Chlordane MR 6 2023
Endrin MR 6 2023
BHC-GAMMA MR 6 2023
Toxaphene MR 6 2023
Di(2-ethylhexyl) adipate MR 6 2023
Picloram MR 6 2023
Hexachlorocyclopentadiene MR 6 2023
Carbofuran MR 6 2023
HEXACHLOROBENZENE MR 6 2023
Benzo(a)pyrene MR 6 2023
Methoxychlor MR 6 2023
Dalapon MR 6 2023
Dinoseb MR 6 2023
Aldicarb sulfoxide MR 6 2023
Aldicarb sulfone MR 6 2023
Atrazine MR 6 2023
LASSO MR 6 2023
Heptachlor MR 6 2023
ETHYLENE DIBROMIDE MR 6 2023
Aldicarb MR 6 2023

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 Chautauqua Water District #2.

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 NY0602924 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 Chautauqua Water District #2 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
2024 LEAD AND COPPER RULE REVISIONS RPT 3 SDWIS / NY0602924 / 5200
2023 Heptachlor epoxide MR 6 SDWIS / NY0602924 / 2067
2023 2,4-D MR 6 SDWIS / NY0602924 / 2105
2023 2,4,5-TP MR 6 SDWIS / NY0602924 / 2110
2023 Pentachlorophenol MR 6 SDWIS / NY0602924 / 2326
2023 Total Polychlorinated Biphenyls (PCB) MR 6 SDWIS / NY0602924 / 2383
2023 Chlordane MR 6 SDWIS / NY0602924 / 2959
2023 Endrin MR 6 SDWIS / NY0602924 / 2005
2023 BHC-GAMMA MR 6 SDWIS / NY0602924 / 2010
2023 Toxaphene MR 6 SDWIS / NY0602924 / 2020
2023 Di(2-ethylhexyl) adipate MR 6 SDWIS / NY0602924 / 2035
2023 Picloram MR 6 SDWIS / NY0602924 / 2040
2023 Hexachlorocyclopentadiene MR 6 SDWIS / NY0602924 / 2042
2023 Carbofuran MR 6 SDWIS / NY0602924 / 2046
2023 HEXACHLOROBENZENE MR 6 SDWIS / NY0602924 / 2274

How Chautauqua Water District #2 Compares

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

Metric Chautauqua Water District #2 New York avg Federal benchmark
Total violations 327 68.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 123 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 490 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 Chautauqua Water District #2 water safe to drink? ▼
Chautauqua Water District #2 (PWS ID: NY0602924) has 327 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 490 people using Surface Water sources.
How many people does Chautauqua Water District #2 serve? ▼
Chautauqua Water District #2 serves 490 people in Mayville, New York. It is a Private-owned system using Surface Water water sources with 172 service connections.
What type of violations does Chautauqua Water District #2 have? ▼
Chautauqua Water District #2 has 327 total violations: 123 health-based violations (MCL exceedances or treatment failures), 197 monitoring/reporting violations, and 38 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Chautauqua Water District #2 water? ▼
No PFAS testing data is available for Chautauqua Water District #2 under the EPA's UCMR5 monitoring program.
What water source does Chautauqua Water District #2 use? ▼
Chautauqua Water District #2 uses Surface Water 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.