Public water system · CT1020021
ActiveScwa, North Stonington Division (Nst)
At a glance
Scwa, North Stonington Division (Nst) (PWSID CT1020021) is an active community water system in New London County, Connecticut. It reports serving 1,860 people through 220 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,860
Service connections
220
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Scwa, North Stonington Division (Nst) compare with other water systems in New London County?
By EPA's size categories, Scwa, North Stonington Division (Nst) is a small system (501 to 3,300 people). New London County has 394 active public water systems. Its population served is about 3.5 times the county average of 532 people per system, and accounts for 0.9% of the 209,444 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 Scwa, North Stonington Division (Nst) 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 Scwa, North Stonington Division (Nst)?
EPA lists Scwa, North Stonington Division (Nst) as owned by a local government. 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. 64 of the 394 active systems in New London County (16%) are also owned by a local government.
Does Scwa, North Stonington Division (Nst) have drinking water violations?
EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in October 2024. The violations listed here began between July 2004 and October 2024. By type: 3 monitoring and reporting, 3 contaminant level above the legal limit, 2 reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (3 of them). EPA lists 8 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2017-07-15 | ReportingNotification, E. coli Maximum Contaminant Level Violation (RTCR · code 4E | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-07-13 | ReportingNotification, E Coli Positive (RTCR) · code 4D | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2015-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-07-15 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2014-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 9 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.
Scwa, North Stonington Division (Nst): frequently asked questions
Who runs Scwa, North Stonington Division (Nst)?
Scwa, North Stonington Division (Nst) (PWSID CT1020021) is a community water system owned by a local government. It is regulated by the CT state drinking water program.
How many people does Scwa, North Stonington Division (Nst) serve?
Scwa, North Stonington Division (Nst) reports serving 1,860 people through 220 service connections in New London County, Connecticut.
Where does Scwa, North Stonington Division (Nst) 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 Scwa, North Stonington Division (Nst) have any drinking water violations?
EPA's records list 9 violations for this system; 3 are health-based, and the most recent began in October 2024. 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 Scwa, North Stonington Division (Nst)'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 9 violations for this system; 3 are health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the CT state drinking water program.
Where can I find Scwa, North Stonington Division (Nst)'s water quality report?
As a community water system, Scwa, North Stonington Division (Nst) 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 London County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Norwich Public Utilities | New London | 36,163 | Community | Surface water |
| Groton Utilities | New London | 30,200 | Community | Surface water |
| New London Dept. of Public Utilities | New London | 27,620 | Community | Surface water |
| Waterford Wpca | New London | 16,578 | Community | Purchased surface water |
| East Lyme Water & Sewer Commission | New London | 15,245 | Community | Purchased surface water |
| Aquarion-Mystic | New London | 10,788 | 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, “Scwa, North Stonington Division (Nst), PWSID CT1020021, Connecticut”, https://aquacensus.com/water-systems/connecticut/scwa-north-stonington-division-nst-ct1020021 (data as of October 1, 2026).