Community Water System · PWS MA1059000
Chester Water Dept
Operator location Chester, Massachusetts - smaller served population (≤ 999) at 750 people served; 226 SDWIS violations on record from surface water sources.
- 750
- People served (this PWS)
- 226
- EPA violations (this PWS)
- 26
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Chester Water Dept standing, high SDWIS violation third
750 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 12% is middle-third health share (≤ 23%). Population rank #23,378 of 29,740 among systems serving 500+.
The verdict
Chester Water Dept sits in the upper third of the sitemap cohort by violation count (226), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (750; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 12% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #23,378 of 29,740
- Population · /systems
- #358 of 418
- Population · MA
- 226
- Total EPA violations on record
- 12%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 250
- County
- Hampden
- School/Daycare
- No
- MCL Violations
- 22
- Monitoring Violations
- 159
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 21 | 2020 |
| Consumer Confidence Rule | Other | 8 | 2017 |
| Total Haloacetic Acids (HAA5) | MR | 7 | 2019 |
| Lead and Copper Rule | MR | 5 | 2023 |
| Nitrate | MR | 4 | 1995 |
| Arsenic | MR | 3 | 2005 |
| Public Notice | Other | 3 | 2010 |
| TTHM | MR | 3 | 2019 |
| LASSO | MR | 3 | 2019 |
| Carbofuran | MR | 3 | 2019 |
| Chlordane | MR | 3 | 2019 |
| 2,4-D | MR | 3 | 2019 |
| Endrin | MR | 3 | 2019 |
| ETHYLENE DIBROMIDE | MR | 3 | 2019 |
| Heptachlor epoxide | MR | 3 | 2019 |
| Heptachlor | MR | 3 | 2019 |
| Pentachlorophenol | MR | 3 | 2019 |
| Toxaphene | MR | 3 | 2019 |
| 2,4,5-TP | MR | 3 | 2019 |
| BHC-GAMMA | MR | 3 | 2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2019 |
| Dalapon | MR | 3 | 2019 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2019 |
| Di(2-ethylhexyl) phthalate | MR | 3 | 2019 |
| Endothall | MR | 3 | 2019 |
| OXAMYL | MR | 3 | 2019 |
| Simazine | MR | 3 | 2019 |
| 2,3,7,8-TCDD | MR | 3 | 2019 |
| Surface Water Treatment Rule | TT | 3 | 1992 |
| Picloram | MR | 3 | 2019 |
Violation Count vs. the National Corpus
Chester Water Dept has 226 recorded EPA violations, 87% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 13% carry more. 12% of this system's own violations are health-based (26 of 226), and it ranks #23,378 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
226 Higher than most more violations than 87% 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
Population served record for Chester Water Dept
EPA SDWIS lists 750 people served and 250 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
226 violations · 750 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.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Chester Water Dept
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Massachusetts compares on the same EPA violation measures. Massachusetts 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.