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Community Water System · PWS CT0120021

Ctwc - Northern Reg-Llynwood System

Clinton, Connecticut 06413 - drinking water served from groundwater sources to 192 people, tracked in EPA SDWIS and UCMR5.

192
People served
148
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 148 drinking-water violations at Ctwc - Northern Reg-Llynwood System - above the Connecticut per-system average.

148
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
192
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ctwc - Northern Reg-Llynwood System

Ctwc - Northern Reg-Llynwood System is a private-owned community water system that delivers drinking water to 192 residents in Clinton, Connecticut (Tolland County) through 73 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 148 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 142 monitoring and reporting violations are on file. The most recent violation on record dates to 2009.

The most frequently cited contaminant at this system is Trichloroethylene, recorded in 9 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Connecticut, EPA tracks 2,332 public water systems serving 2,886,005 people, with 206,662 cumulative violations and 21,779 health-based violations on record. About 94% of systems in the state carry at least one violation, and state-wide the average per system is 88.6 violations. Statewide, 40 of 63 UCMR5-tested systems have reported PFAS detections (63.5%).

Ctwc - Northern Reg-Llynwood System's 148 violations sit above the Connecticut average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
192
Total Violations
148
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
73
County
Tolland
School/Daycare
No
MCL Violations
0
Monitoring Violations
142
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Trichloroethylene MR 9 2009
1,2,4-Trichlorobenzene MR 7 2009
o-Dichlorobenzene MR 7 2009
p-Dichlorobenzene MR 7 2009
Vinyl chloride MR 7 2009
1,1-Dichloroethylene MR 7 2009
trans-1,2-Dichloroethylene MR 7 2009
1,2-Dichloroethane MR 7 2009
1,1,1-Trichloroethane MR 7 2009
CHLOROBENZENE MR 7 2009
Toluene MR 7 2009
Ethylbenzene MR 7 2009
Styrene MR 7 2009
DICHLOROMETHANE MR 7 2009
Benzene MR 7 2009
Tetrachloroethylene MR 7 2009
cis-1,2-Dichloroethylene MR 7 2009
Carbon tetrachloride MR 7 2009
1,1,2-Trichloroethane MR 7 2009
1,2-Dichloropropane MR 7 2009

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Ctwc - Northern Reg-Llynwood System.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID CT0120021 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Connecticut Drinking Water Authority

Connecticut's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find CT regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2009 Trichloroethylene MR 9 SDWIS / CT0120021 / 2984
2009 1,2,4-Trichlorobenzene MR 7 SDWIS / CT0120021 / 2378
2009 o-Dichlorobenzene MR 7 SDWIS / CT0120021 / 2968
2009 p-Dichlorobenzene MR 7 SDWIS / CT0120021 / 2969
2009 Vinyl chloride MR 7 SDWIS / CT0120021 / 2976
2009 1,1-Dichloroethylene MR 7 SDWIS / CT0120021 / 2977
2009 trans-1,2-Dichloroethylene MR 7 SDWIS / CT0120021 / 2979
2009 1,2-Dichloroethane MR 7 SDWIS / CT0120021 / 2980
2009 1,1,1-Trichloroethane MR 7 SDWIS / CT0120021 / 2981
2009 CHLOROBENZENE MR 7 SDWIS / CT0120021 / 2989
2009 Toluene MR 7 SDWIS / CT0120021 / 2991
2009 Ethylbenzene MR 7 SDWIS / CT0120021 / 2992
2009 Styrene MR 7 SDWIS / CT0120021 / 2996
2009 DICHLOROMETHANE MR 7 SDWIS / CT0120021 / 2964
2009 Benzene MR 7 SDWIS / CT0120021 / 2990

How Ctwc - Northern Reg-Llynwood System Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Ctwc - Northern Reg-Llynwood System Connecticut avg Federal benchmark
Total violations 148 88.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 9.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 63.5% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 192 1,238 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,332 regulated public water systems in Connecticut.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Ctwc - Northern Reg-Llynwood System water safe to drink? ▼
Ctwc - Northern Reg-Llynwood System (PWS ID: CT0120021) has 148 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 192 people using Groundwater sources.
How many people does Ctwc - Northern Reg-Llynwood System serve? ▼
Ctwc - Northern Reg-Llynwood System serves 192 people in Clinton, Connecticut. It is a Private-owned system using Groundwater water sources with 73 service connections.
What type of violations does Ctwc - Northern Reg-Llynwood System have? ▼
Ctwc - Northern Reg-Llynwood System has 148 total violations: 0 health-based violations (MCL exceedances or treatment failures), 142 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ctwc - Northern Reg-Llynwood System water? ▼
No PFAS testing data is available for Ctwc - Northern Reg-Llynwood System under the EPA's UCMR5 monitoring program.
What water source does Ctwc - Northern Reg-Llynwood System use? ▼
Ctwc - Northern Reg-Llynwood System uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.