Community Water System · PWS MA4062000
Menemsha Water Company
Operator location Chilmark, Massachusetts - smaller served population (≤ 999) at 841 people served; 74 SDWIS violations on record from groundwater sources.
- 841
- People served (this PWS)
- 74
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Menemsha Water Company standing, mid SDWIS violation third
841 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). Population rank #21,911 of 29,740 among systems serving 500+.
The verdict
Menemsha Water Company lands in the middle third by violation volume (74), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (841; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 9% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #21,911 of 29,740
- Population · /systems
- #352 of 418
- Population · MA
- 74
- Total EPA violations on record
- 9%
- 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
- Private
- Connections
- 95
- County
- Dukes
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 31
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Revised Total Coliform Rule | RPT | 20 | 2018 |
| Revised Total Coliform Rule | MON | 11 | 2021 |
| Coliform (TCR) | MR | 10 | 2009 |
| Nitrate | MR | 8 | 2024 |
| Coliform (TCR) | MCL | 7 | 2009 |
| Coliform (TCR) | Other | 3 | 2008 |
| Nitrite | MR | 2 | 2001 |
| Public Notice | Other | 2 | 2008 |
Violation Count vs. the National Corpus
Menemsha Water Company has 74 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 33% carry more. 9% of this system's own violations are health-based (7 of 74), and it ranks #21,911 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)
74 Around the middle fewer violations than 33% 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 Menemsha Water Company
EPA SDWIS lists 841 people served and 95 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
74 violations · 841 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 smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Menemsha Water Company
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.