Public water system · CT0600041
ActiveQuonnipaug Hills - Main System
At a glance
Quonnipaug Hills - Main System (PWSID CT0600041) is an active community water system in New Haven County, Connecticut. It reports serving 564 people through 187 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 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
564
Service connections
187
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Quonnipaug Hills - Main System compare with other water systems in New Haven County?
By EPA's size categories, Quonnipaug Hills - Main System is a small system (501 to 3,300 people). New Haven County has 212 active public water systems. Its population served is well below the county average of 3,412 people per system, and accounts for less than 0.1% of the 723,334 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 Quonnipaug Hills - Main 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 Quonnipaug Hills - Main System?
EPA lists Quonnipaug Hills - Main 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. 174 of the 212 active systems in New Haven County (82%) are also privately owned.
Does Quonnipaug Hills - Main 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 January 2025. The violations listed here began between January 2019 and January 2025. By type: 11 monitoring and reporting and 1 reporting. The contaminant or rule involved most often is E. coli (7 of them). 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2019-03-10 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-02-01 | Monitoring and reportingFailure to Conduct Assessment Monitoring · code 19 | E. colicode 3014 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlorobenzenecode 2989 | No | Resolved |
| 2019-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | 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.
Quonnipaug Hills - Main System: frequently asked questions
Who runs Quonnipaug Hills - Main System?
Quonnipaug Hills - Main System (PWSID CT0600041) is a community water system privately owned. It is regulated by the CT state drinking water program.
How many people does Quonnipaug Hills - Main System serve?
Quonnipaug Hills - Main System reports serving 564 people through 187 service connections in New Haven County, Connecticut.
Where does Quonnipaug Hills - Main 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 Quonnipaug Hills - Main 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 January 2025. 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 Quonnipaug Hills - Main 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 January 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the CT state drinking water program.
Where can I find Quonnipaug Hills - Main System's water quality report?
As a community water system, Quonnipaug Hills - Main 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 New Haven County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Regional Water Authority | New Haven | 418,900 | Community | Surface water |
| Waterbury Water Department | New Haven | 107,271 | Community | Surface water |
| Meriden Water Division | New Haven | 58,441 | Community | Surface water |
| Wallingford Water Department | New Haven | 37,267 | Community | Surface water |
| Ctwc - Shoreline Region-Guilford System | New Haven | 33,975 | Community | Surface water |
| Ctwc - Naugatuck Region-Central System | New Haven | 22,735 | Community | 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, “Quonnipaug Hills - Main System, PWSID CT0600041, Connecticut”, https://aquacensus.com/water-systems/connecticut/quonnipaug-hills-main-system-ct0600041 (data as of October 1, 2026).