Non-Transient Non-Community Water System · PWS CT0730122
Lisbon Central School
Operator location Lisbon, Connecticut - 32% of 41 violations are health-based (upper-third health share (> 23%)); groundwater source; 620 served per SDWIS.
- 620
- People served (this PWS)
- 41
- EPA violations (this PWS)
- 13
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Lisbon Central School standing, mid SDWIS violation third
32% of 41 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 32% is upper-third health share (> 23%). Population rank #25,767 of 29,740 among systems serving 500+.
The verdict
Lisbon Central School lands in the middle third by violation volume (41), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (620; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 32% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #25,767 of 29,740
- Population · /systems
- #149 of 184
- Population · CT
- 41
- Total EPA violations on record
- 32%
- 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
- 1
- County
- New London
- School/Daycare
- Yes
- MCL Violations
- 13
- Monitoring Violations
- 27
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 13 | 2013 |
| Revised Total Coliform Rule | MON | 8 | 2022 |
| Lead and Copper Rule | MR | 6 | 2022 |
| Coliform (TCR) | MR | 5 | 2007 |
| E. COLI | MR | 4 | 2021 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2022 |
Violation Count vs. the National Corpus
Lisbon Central School has 41 recorded EPA violations, 51% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 48% carry more. 32% of this system's own violations are health-based (13 of 41), and it ranks #25,767 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)
41 Around the middle fewer violations than 48% 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 Lisbon Central School
13 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CT0730122.
Sources: EPA SDWIS
Nationwide peers
41 violations · 620 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 Lisbon Central School
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Connecticut compares on the same EPA violation measures. Connecticut 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.