Public water system · CT0670331
ActiveCtwc - Amston Lake Division
At a glance
Ctwc - Amston Lake Division (PWSID CT0670331) is an active community water system in Tolland County, Connecticut. It reports serving 910 people through 325 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
910
Service connections
325
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ctwc - Amston Lake Division compare with other water systems in Tolland County?
By EPA's size categories, Ctwc - Amston Lake Division is a small system (501 to 3,300 people). Tolland County has 296 active public water systems, and Ctwc - Amston Lake Division is the 5th-largest of them by population served. Its population served is about 4.5 times the county average of 202 people per system, and accounts for 1.5% of the 59,796 people reported by systems filed under the county. Across Connecticut, the 2,363 active systems average 1,247 people each. Nationally, the average active community water system reports serving 6,703 people, so Ctwc - Amston Lake Division is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Connecticut has 481 active community water systems, 20% of the state's 2,363 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,263 Connecticut systems (96%) list groundwater as their primary source.
Who owns and regulates Ctwc - Amston Lake Division?
EPA lists Ctwc - Amston Lake Division as privately owned. The CT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 253 of the 296 active systems in Tolland County (85%) are also privately owned.
Does Ctwc - Amston Lake Division have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2014. The violations listed here began between January 2014 and January 2014. By type: 12 monitoring and reporting. The contaminants or rules involved are p-Dichlorobenzene, 1,2,4-Trichlorobenzene, 1,2-Dibromo-3-chloropropane (DBCP) and cis-1,2-Dichloroethylene. EPA lists 12 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Polychlorinated biphenyls (PCBs), totalcode 2383 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylene dibromide (EDB)code 2946 | No | Archived |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Archived |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Ctwc - Amston Lake Division: frequently asked questions
Who runs Ctwc - Amston Lake Division?
Ctwc - Amston Lake Division (PWSID CT0670331) is a community water system privately owned. It is regulated by the CT state drinking water program.
How many people does Ctwc - Amston Lake Division serve?
Ctwc - Amston Lake Division reports serving 910 people through 325 service connections in Tolland County, Connecticut.
Where does Ctwc - Amston Lake Division get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Ctwc - Amston Lake Division have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2014. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Ctwc - Amston Lake Division's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2014. For current results, consult the system's annual water quality report, EPA ECHO, or the CT state drinking water program.
Where can I find Ctwc - Amston Lake Division's water quality report?
As a community water system, Ctwc - Amston Lake Division must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Tolland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| University of Connecticut - Main Campus | Tolland | 27,199 | Community | Purchased surface water |
| Ctwc - Hebron Center Division | Tolland | 1,927 | Community | Groundwater |
| Coventry High & Nathan Hale Schools | Tolland | 1,252 | Non-transient non-community | Groundwater |
| Tolland Water Department | Tolland | 1,251 | Community | Groundwater |
| Horace Porter School | Tolland | 797 | Non-transient non-community | Groundwater |
| Bolton Center School (K-8) | Tolland | 756 | Non-transient non-community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Ctwc - Amston Lake Division, PWSID CT0670331, Connecticut”, https://aquacensus.com/water-systems/connecticut/ctwc-amston-lake-division-ct0670331 (data as of October 1, 2026).