Public water system · CT0990713
Active5 Ardsley Avenue
At a glance
5 Ardsley Avenue (PWSID CT0990713) is an active non-transient non-community water system in New Haven County, Connecticut. It reports serving 50 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in December 2014.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
50
Service connections
2
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does 5 Ardsley Avenue compare with other water systems in New Haven County?
By EPA's size categories, 5 Ardsley Avenue is a very small system (500 people or fewer). 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 non-transient non-community water system reports serving 430 people, so 5 Ardsley Avenue is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Connecticut has 483 active non-transient non-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 5 Ardsley Avenue?
EPA lists 5 Ardsley Avenue 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 5 Ardsley Avenue have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in December 2014. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2014-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
5 Ardsley Avenue: frequently asked questions
Who runs 5 Ardsley Avenue?
5 Ardsley Avenue (PWSID CT0990713) is a non-transient non-community water system privately owned. It is regulated by the CT state drinking water program.
How many people does 5 Ardsley Avenue serve?
5 Ardsley Avenue reports serving 50 people through 2 service connections in New Haven County, Connecticut.
Where does 5 Ardsley Avenue 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 5 Ardsley Avenue have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in December 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 5 Ardsley Avenue'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 one violation for this system; it is not health-based, and the most recent began in December 2014. For current results, consult EPA ECHO, or the CT state drinking water program.
Where can I find 5 Ardsley Avenue's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. 5 Ardsley Avenue is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
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 |
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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, “5 Ardsley Avenue, PWSID CT0990713, Connecticut”, https://aquacensus.com/water-systems/connecticut/5-ardsley-avenue-ct0990713 (data as of October 1, 2026).