Public water system · CT1410011
ActiveCtwc - Thompson System
At a glance
Ctwc - Thompson System (PWSID CT1410011) is an active community water system in Windham County, Connecticut. It reports serving 1,070 people through 484 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 April 2015.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,070
Service connections
484
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ctwc - Thompson System compare with other water systems in Windham County?
By EPA's size categories, Ctwc - Thompson System is a small system (501 to 3,300 people). Windham County has 254 active public water systems. Its population served is about 4.3 times the county average of 251 people per system, and accounts for 1.7% of the 63,868 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 - Thompson System 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 - Thompson System?
EPA lists Ctwc - Thompson System 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. 220 of the 254 active systems in Windham County (87%) are also privately owned.
Does Ctwc - Thompson System have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2015. The violations listed here began between April 2015 and April 2015. By type: 12 monitoring and reporting. The contaminants or rules involved are Endrin, Glyphosate, Aldicarb and Picloram. EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Glyphosatecode 2034 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Aldicarbcode 2047 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Picloramcode 2040 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Aldicarb sulfoxidecode 2043 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Aldicarb sulfonecode 2044 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dinosebcode 2041 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dalaponcode 2031 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2015-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
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 - Thompson System: frequently asked questions
Who runs Ctwc - Thompson System?
Ctwc - Thompson System (PWSID CT1410011) is a community water system privately owned. It is regulated by the CT state drinking water program.
How many people does Ctwc - Thompson System serve?
Ctwc - Thompson System reports serving 1,070 people through 484 service connections in Windham County, Connecticut.
Where does Ctwc - Thompson System 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 - Thompson System 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 April 2015. 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 - Thompson System'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 April 2015. 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 - Thompson System's water quality report?
As a community water system, Ctwc - Thompson System 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 Windham County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Windham Water Works | Windham | 21,214 | Community | Surface water |
| Putnam Water Pollution Control Authority | Windham | 7,300 | Community | Surface water |
| Ctwc - Crystal System | Windham | 6,378 | Community | Groundwater |
| Ctwc - Gallup System | Windham | 2,538 | Community | Groundwater |
| Ctwc - Plainfield System | Windham | 1,713 | Community | Groundwater |
| Killingly High School & Agricultural Ctr | Windham | 1,400 | 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 - Thompson System, PWSID CT1410011, Connecticut”, https://aquacensus.com/water-systems/connecticut/ctwc-thompson-system-ct1410011 (data as of October 1, 2026).