Transient Non-Community Water System · PWS CT1020164
Mystic KOA
Operator location North Stonington, Connecticut - 47% of 118 violations are health-based (upper-third health share (> 23%)); groundwater source; 33 served per SDWIS.
- 33
- People served (this PWS)
- 118
- EPA violations (this PWS)
- 56
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mystic KOA standing, high SDWIS violation third
47% of 118 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 47% is upper-third health share (> 23%).
The verdict
Mystic KOA sits in the upper third of the sitemap cohort by violation count (118), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (33; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 47% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 118
- Total EPA violations on record
- 47%
- Health-based (MCL / treatment failure)
- 33
- 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
- Transient Non-Community
- Owner Type
- Private
- Connections
- 275
- County
- New London
- School/Daycare
- No
- MCL Violations
- 24
- Monitoring Violations
- 44
- Treatment Tech Violations
- 32
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 24 | 2015 |
| Coliform (TCR) | MR | 18 | 2015 |
| Groundwater Rule | TT | 16 | 2012 |
| E. COLI | MR | 16 | 2018 |
| Revised Total Coliform Rule | TT | 16 | 2023 |
| Public Notice | Other | 12 | 2023 |
| Groundwater Rule | MR | 6 | 2012 |
| Revised Total Coliform Rule | MON | 4 | 2018 |
Violation Count vs. the National Corpus
Mystic KOA has 118 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 47% of this system's own violations are health-based (56 of 118), 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)
118 Higher than most more violations than 76% 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 Mystic KOA
56 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for CT1020164.
Sources: EPA SDWIS
Nationwide peers
118 violations · 33 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 Mystic KOA
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.