Community Water System · PWS MA3344000
Winchester Water Dept
Operator location Winchester, Massachusetts - larger served population (> 3,309) at 22,970 people served; 62 SDWIS violations on record from surface water sources.
- 22,970
- People served (this PWS)
- 62
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Winchester Water Dept standing, mid SDWIS violation third
22,970 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected. Population rank #2,429 of 29,740 among systems serving 500+.
The verdict
Winchester Water Dept lands in the middle third by violation volume (62), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (22,970; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 6% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- #2,429 of 29,740
- Population · /systems
- #103 of 418
- Population · MA
- 62
- Total EPA violations on record
- 6%
- 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
- 7,142
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 48
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 4 | 2005 |
| Nitrate | MR | 3 | 2014 |
| Coliform (TCR) | MCL | 3 | 1997 |
| Fluoride | MR | 2 | 2014 |
| Mercury | MR | 2 | 2014 |
| Selenium | MR | 2 | 2014 |
| Cadmium | MR | 2 | 2014 |
| Antimony, Total | MR | 2 | 2014 |
| Beryllium, Total | MR | 2 | 2014 |
| Nickel | MR | 2 | 2014 |
| Thallium, Total | MR | 2 | 2014 |
| CYANIDE | MR | 2 | 2014 |
| 2,4,5-TP | MR | 2 | 1991 |
| 2,4-D | MR | 2 | 1991 |
| Toxaphene | MR | 2 | 1991 |
| Methoxychlor | MR | 2 | 1991 |
| BHC-GAMMA | MR | 2 | 1991 |
| Endrin | MR | 2 | 1991 |
| Chromium | MR | 2 | 2014 |
| Barium | MR | 2 | 2014 |
| Arsenic | MR | 2 | 2014 |
| Surface Water Treatment Rule | TT | 1 | 1992 |
| Radium-226 | MR | 1 | 1997 |
| Radium-228 | MR | 1 | 1997 |
| Gross Beta Particle Activity | MR | 1 | 1997 |
| 38-STRONTIUM-90 | MR | 1 | 1997 |
| Tritium | MR | 1 | 1997 |
Violation Count vs. the National Corpus
Winchester Water Dept has 62 recorded EPA violations, 62% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 37% carry more. 6% of this system's own violations are health-based (4 of 62), and it ranks #2,429 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)
62 Around the middle fewer violations than 37% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFDA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NFDHA | 7/2/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 7/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 7/2/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 7/2/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 7/2/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/2/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/2/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/2/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 7/2/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/2/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
Population served record for Winchester Water Dept
EPA SDWIS lists 22,970 people served and 7,142 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
62 violations · 22,970 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Winchester 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.