Community Water System · PWS MA4351000
Yarmouth Water Department
Operator location West Yarmouth, Massachusetts - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 54 violations and 38,900 people served.
- 38,900
- People served (this PWS)
- 54
- EPA violations (this PWS)
- 12
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Yarmouth Water Department standing, mid SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 22% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #1,444 of 29,740 among systems serving 500+.
The verdict
Yarmouth Water Department lands in the middle third by violation volume (54), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (38,900; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 22% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #1,444 of 29,740
- Population · /systems
- #53 of 418
- Population · MA
- 54
- Total EPA violations on record
- 22%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 16,357
- County
- Barnstable
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 25
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 10 | 2013 |
| Coliform (TCR) | MR | 8 | 2011 |
| Nitrate | MR | 3 | 2021 |
| Coliform (TCR) | Other | 3 | 2011 |
| Revised Total Coliform Rule | RPT | 2 | 2018 |
| Revised Total Coliform Rule | TT | 2 | 2018 |
| Cadmium | MR | 1 | 2006 |
| Nickel | MR | 1 | 2006 |
| Thallium, Total | MR | 1 | 2006 |
| Mercury | MR | 1 | 2006 |
| Selenium | MR | 1 | 2006 |
| CYANIDE | MR | 1 | 2006 |
| Fluoride | MR | 1 | 2006 |
| Chromium | MR | 1 | 2006 |
| Beryllium, Total | MR | 1 | 2006 |
| Barium | MR | 1 | 2006 |
| Antimony, Total | MR | 1 | 2006 |
| ENTEROCOCCI | MR | 1 | 2021 |
| Nitrite | MR | 1 | 2020 |
| Arsenic | MR | 1 | 2006 |
Violation Count vs. the National Corpus
Yarmouth Water Department has 54 recorded EPA violations, 59% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 41% carry more. 22% of this system's own violations are health-based (12 of 54), and it ranks #1,444 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)
54 Around the middle fewer violations than 41% 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. 17 of 870 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 7/29/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 7/29/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFPeS | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 7/29/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| NEtFOSAA | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 7/29/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NMeFOSAA | 7/29/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| 9Cl-PF3ONS | 7/29/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 7/29/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 7/29/2025 | 4.10 ppt | 3.00 ppt | Detected |
| 8:2 FTS | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDoA | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 7/29/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHxS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 7/29/2025 | 3.20 ppt | 3.00 ppt | Detected |
| NMeFOSAA | 7/29/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFNA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 7/29/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 7/29/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 7/29/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
UCMR5 PFAS record for Yarmouth Water Department
Open EPA SDWIS federal reports for PWS MA4351000 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
54 violations · 38,900 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 Yarmouth Water Department
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.