Public water system · CT1090081
ActiveCtwc - Plainfield System
At a glance
Ctwc - Plainfield System (PWSID CT1090081) is an active community water system in Windham County, Connecticut. It reports serving 1,713 people through 676 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in December 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,713
Service connections
676
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ctwc - Plainfield System compare with other water systems in Windham County?
By EPA's size categories, Ctwc - Plainfield System is a small system (501 to 3,300 people). Windham County has 254 active public water systems, and Ctwc - Plainfield System is the 5th-largest of them by population served. Its population served is about 6.8 times the county average of 251 people per system, and accounts for 2.7% 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 - Plainfield 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 - Plainfield System?
EPA lists Ctwc - Plainfield 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 - Plainfield System have drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in December 2008. The violations listed here began between November 1994 and December 2008. By type: 3 contaminant level above the legal limit, 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2008-12-08 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2008-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-01-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 5 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 - Plainfield System: frequently asked questions
Who runs Ctwc - Plainfield System?
Ctwc - Plainfield System (PWSID CT1090081) is a community water system privately owned. It is regulated by the CT state drinking water program.
How many people does Ctwc - Plainfield System serve?
Ctwc - Plainfield System reports serving 1,713 people through 676 service connections in Windham County, Connecticut.
Where does Ctwc - Plainfield 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 - Plainfield System have any drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in December 2008. 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 - Plainfield 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 5 violations for this system; 3 are health-based, and the most recent began in December 2008. 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 - Plainfield System's water quality report?
As a community water system, Ctwc - Plainfield 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 |
| Killingly High School & Agricultural Ctr | Windham | 1,400 | Non-transient non-community | Groundwater |
| Woodstock Academy | Windham | 1,125 | Non-transient non-community | Groundwater |
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 - Plainfield System, PWSID CT1090081, Connecticut”, https://aquacensus.com/water-systems/connecticut/ctwc-plainfield-system-ct1090081 (data as of October 1, 2026).