Community Water System · PWS NY0602924
Chautauqua Water District #2
Operator location Mayville, New York - 38% of 327 violations are health-based (upper-third health share (> 23%)); surface water source; 490 served per SDWIS.
- 490
- People served (this PWS)
- 327
- EPA violations (this PWS)
- 123
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Chautauqua Water District #2 standing, high SDWIS violation third
38% of 327 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 38% is upper-third health share (> 23%).
The verdict
Chautauqua Water District #2 sits in the upper third of the sitemap cohort by violation count (327), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (490; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 38% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 327
- Total EPA violations on record
- 38%
- Health-based (MCL / treatment failure)
- 490
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Chautauqua Water District #2 has 327 recorded EPA violations, 92% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 8% carry more. 38% of this system's own violations are health-based (123 of 327), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
327 Higher than most more violations than 92% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Chautauqua Water District #2
123 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NY0602924.
Sources: EPA SDWIS · New York State Department of Health, Public Water Systems
Nationwide peers
327 violations · 490 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Chautauqua Water District #2
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New York compares on the same EPA violation measures. New York systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.