Community Water System · PWS CT0670331
Ctwc - Amston Lake Division
Operator location Clinton, Connecticut - smaller served population (≤ 999) at 910 people served; 304 SDWIS violations on record from groundwater sources.
- 910
- People served (this PWS)
- 304
- EPA violations (this PWS)
- 16
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Ctwc - Amston Lake Division standing, high SDWIS violation third
910 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). Population rank #20,835 of 29,740 among systems serving 500+.
The verdict
Ctwc - Amston Lake Division sits in the upper third of the sitemap cohort by violation count (304), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (910; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #20,835 of 29,740
- Population · /systems
- #109 of 184
- Population · CT
- 304
- Total EPA violations on record
- 5%
- 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
- 325
- County
- Tolland
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 281
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 16 | 2004 |
| Gross Alpha, Excl. Radon and U | MR | 12 | 2014 |
| Combined Radium (-226 and -228) | MR | 12 | 2014 |
| Combined Uranium | MR | 12 | 2014 |
| Coliform (TCR) | MR | 6 | 2004 |
| Selenium | MR | 4 | 1990 |
| Endrin | MR | 4 | 2014 |
| Dalapon | MR | 4 | 2014 |
| Diquat | MR | 4 | 2014 |
| Picloram | MR | 4 | 2014 |
| Dinoseb | MR | 4 | 2014 |
| HEXACHLOROBENZENE | MR | 4 | 2014 |
| Benzo(a)pyrene | MR | 4 | 2014 |
| Methoxychlor | MR | 4 | 2014 |
| Toxaphene | MR | 4 | 2014 |
| Carbofuran | MR | 4 | 2014 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2014 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 4 | 2014 |
| Chlordane | MR | 4 | 2014 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2014 |
| cis-1,2-Dichloroethylene | MR | 4 | 2014 |
| DICHLOROMETHANE | MR | 4 | 2014 |
| p-Dichlorobenzene | MR | 4 | 2014 |
| Vinyl chloride | MR | 4 | 2014 |
| 1,1-Dichloroethylene | MR | 4 | 2014 |
| trans-1,2-Dichloroethylene | MR | 4 | 2014 |
| 1,2-Dichloroethane | MR | 4 | 2014 |
| 1,1,1-Trichloroethane | MR | 4 | 2014 |
| 1,1,2-Trichloroethane | MR | 4 | 2014 |
| Toluene | MR | 4 | 2014 |
Violation Count vs. the National Corpus
Ctwc - Amston Lake Division has 304 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 5% of this system's own violations are health-based (16 of 304), and it ranks #20,835 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)
304 Higher than most more violations than 91% 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 Ctwc - Amston Lake Division
EPA SDWIS lists 910 people served and 325 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
304 violations · 910 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.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Ctwc - Amston Lake Division
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.