Community Water System · PWS MA3317001
Wellesley College
Operator location Wellesley, Massachusetts - 45% of 33 violations are health-based (upper-third health share (> 23%)); groundwater source; 3,000 served per SDWIS.
- 3,000
- People served (this PWS)
- 33
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Wellesley College standing, mid SDWIS violation third
45% of 33 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 45% is upper-third health share (> 23%). Population rank #10,617 of 29,740 among systems serving 500+.
The verdict
Wellesley College lands in the middle third by violation volume (33), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 3,000 (mid served population (≤ 3,309)). Health-based share is 45% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #10,617 of 29,740
- Population · /systems
- #272 of 418
- Population · MA
- 33
- Total EPA violations on record
- 45%
- 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
- 62
- County
- Norfolk
- School/Daycare
- Yes
- MCL Violations
- 15
- Monitoring Violations
- 6
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 14 | 1998 |
| Lead and Copper Rule | MR | 3 | 2023 |
| Nitrate | MR | 1 | 2014 |
| Coliform (TCR) | MR | 1 | 1997 |
| Nitrite | MR | 1 | 2014 |
| Revised Total Coliform Rule | MCL | 1 | 2016 |
Violation Count vs. the National Corpus
Wellesley College has 33 recorded EPA violations, 45% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 54% carry more. 45% of this system's own violations are health-based (15 of 33), and it ranks #10,617 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)
33 Lower than most fewer violations than 54% 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 Wellesley College
15 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MA3317001.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
33 violations · 3,000 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Wellesley College
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.