Non-Transient Non-Community Water System · PWS MA4250002
Rochester Memorial School
Operator location Rochester, Massachusetts - 33% of 18 violations are health-based (upper-third health share (> 23%)); groundwater source; 688 served per SDWIS.
- 688
- People served (this PWS)
- 18
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Rochester Memorial School standing, low SDWIS violation third
33% of 18 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 33% is upper-third health share (> 23%). Population rank #24,618 of 29,740 among systems serving 500+.
The verdict
Rochester Memorial School is in the lower third by violation count (18; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is smaller (688; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 33% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #24,618 of 29,740
- Population · /systems
- #366 of 418
- Population · MA
- 18
- Total EPA violations on record
- 33%
- 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
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 2
- County
- Plymouth
- School/Daycare
- Yes
- MCL Violations
- 6
- Monitoring Violations
- 6
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 6 | 2011 |
| Lead and Copper Rule | MR | 4 | 2011 |
| Nitrite | MR | 1 | 2014 |
| Nitrate | MR | 1 | 2000 |
Violation Count vs. the National Corpus
Rochester Memorial School has 18 recorded EPA violations, 29% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 70% carry more. 33% of this system's own violations are health-based (6 of 18), and it ranks #24,618 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)
18 Lower than most fewer violations than 70% 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
Health-based violations on Rochester Memorial School
6 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MA4250002.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
18 violations · 688 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
- Cheyenne Arapaho Concho EPA Region 6 — Tribal Water Systems 18violations
- Assiniboine & Sioux Rural Water System EPA Region 8 — Tribal Water Systems 18violations
- Poplar, City Of EPA Region 8 — Tribal Water Systems 18violations
- Torreon-Ojo Encino East - NTUA EPA Region 9 — Tribal Water Systems 18violations
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Rochester Memorial School
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.