Public water system · CT1110011
ActiveCtwc - Naugatuck Reg-Terryville System
At a glance
Ctwc - Naugatuck Reg-Terryville System (PWSID CT1110011) is an active community water system in Litchfield County, Connecticut. It reports serving 5,607 people through 2,383 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; all are health-based, and the most recent began in June 1998.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,607
Service connections
2,383
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ctwc - Naugatuck Reg-Terryville System compare with other water systems in Litchfield County?
By EPA's size categories, Ctwc - Naugatuck Reg-Terryville System is a medium system (3,301 to 10,000 people). Litchfield County has 346 active public water systems, and Ctwc - Naugatuck Reg-Terryville System is the 5th-largest of them by population served. Its population served is about 17 times the county average of 340 people per system, and accounts for 4.8% of the 117,512 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 - Naugatuck Reg-Terryville System is about 16% 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 - Naugatuck Reg-Terryville System?
EPA lists Ctwc - Naugatuck Reg-Terryville 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. 297 of the 346 active systems in Litchfield County (86%) are also privately owned.
Does Ctwc - Naugatuck Reg-Terryville System have drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in June 1998. The violations listed here began between August 1993 and June 1998. By type: 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 1998-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 2 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 - Naugatuck Reg-Terryville System: frequently asked questions
Who runs Ctwc - Naugatuck Reg-Terryville System?
Ctwc - Naugatuck Reg-Terryville System (PWSID CT1110011) is a community water system privately owned. It is regulated by the CT state drinking water program.
How many people does Ctwc - Naugatuck Reg-Terryville System serve?
Ctwc - Naugatuck Reg-Terryville System reports serving 5,607 people through 2,383 service connections in Litchfield County, Connecticut.
Where does Ctwc - Naugatuck Reg-Terryville 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 - Naugatuck Reg-Terryville System have any drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in June 1998. 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 - Naugatuck Reg-Terryville 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. EPA's records list 2 violations for this system; all are health-based, and the most recent began in June 1998. 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 - Naugatuck Reg-Terryville System's water quality report?
As a community water system, Ctwc - Naugatuck Reg-Terryville 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 Litchfield County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Torrington Water Company | Litchfield | 37,915 | Community | Surface water |
| Watertown Water & Sewer Authority | Litchfield | 9,972 | Community | Purchased surface water |
| Winsted Water Works | Litchfield | 7,784 | Community | Surface water |
| Watertown Fire District | Litchfield | 6,718 | Community | Groundwater |
| Ctwc - Naugatuck Reg-Thomaston System | Litchfield | 3,789 | Community | Groundwater |
| Aquarion-Litchfield Regional | Litchfield | 3,097 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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 - Naugatuck Reg-Terryville System, PWSID CT1110011, Connecticut”, https://aquacensus.com/water-systems/connecticut/ctwc-naugatuck-reg-terryville-system-ct1110011 (data as of October 1, 2026).