Community Water System · PWS MA4239010
Masac Plymouth
Operator location Milford, Massachusetts - smaller served population (≤ 999) at 210 people served; 80 SDWIS violations on record from groundwater sources.
- 210
- People served (this PWS)
- 80
- EPA violations (this PWS)
- 10
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Masac Plymouth standing, high SDWIS violation third
210 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%).
The verdict
Masac Plymouth sits in the upper third of the sitemap cohort by violation count (80), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (210; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 13% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 80
- Total EPA violations on record
- 13%
- Health-based (MCL / treatment failure)
- 210
- 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
- State
- Connections
- 3
- County
- Plymouth
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 58
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 10 | 2011 |
| Coliform (TCR) | Other | 4 | 2011 |
| Coliform (TCR) | MR | 4 | 2005 |
| Nitrate | MR | 2 | 2014 |
| 2,4,5-TP | MR | 1 | 2005 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2005 |
| Benzo(a)pyrene | MR | 1 | 2005 |
| Di(2-ethylhexyl) adipate | MR | 1 | 2005 |
| Atrazine | MR | 1 | 2005 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2005 |
| Dinoseb | MR | 1 | 2005 |
| Diquat | MR | 1 | 2005 |
| Endothall | MR | 1 | 2005 |
| HEXACHLOROBENZENE | MR | 1 | 2005 |
| Hexachlorocyclopentadiene | MR | 1 | 2005 |
| Picloram | MR | 1 | 2005 |
| Simazine | MR | 1 | 2005 |
| 2,3,7,8-TCDD | MR | 1 | 2005 |
| 1,1-Dichloroethylene | MR | 1 | 2005 |
| 1,2-Dichloroethane | MR | 1 | 2005 |
| o-Dichlorobenzene | MR | 1 | 2005 |
| trans-1,2-Dichloroethylene | MR | 1 | 2005 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| 1,2-Dichloropropane | MR | 1 | 2005 |
| Tetrachloroethylene | MR | 1 | 2005 |
| p-Dichlorobenzene | MR | 1 | 2005 |
| DICHLOROMETHANE | MR | 1 | 2005 |
| 1,1,2-Trichloroethane | MR | 1 | 2005 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2005 |
| ETHYLENE DIBROMIDE | MR | 1 | 2005 |
Violation Count vs. the National Corpus
Masac Plymouth has 80 recorded EPA violations, 68% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 31% carry more. 13% of this system's own violations are health-based (10 of 80), 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)
80 Around the middle fewer violations than 31% 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 Masac Plymouth
EPA SDWIS lists 210 people served and 3 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
80 violations · 210 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 Masac Plymouth
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.