PlainWater
States → Connecticut

AQUARION-TWIN OAKS

PWS ID: CT0968011 · SHELTON, Connecticut 06484

AQUARION-TWIN OAKS serves 152 people in SHELTON, Connecticut using Groundwater water sources. It has 61 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: AQUARION-TWIN OAKS

AQUARION-TWIN OAKS is a private-owned community water system that delivers drinking water to 152 residents in SHELTON, Connecticut (Litchfield County) through 57 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 61 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 53 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Gross Alpha, Excl. Radon and U, recorded in 4 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. AQUARION-TWIN OAKS's 61 violations sit below the Connecticut average. Statewide, 40 of 63 UCMR5-tested systems have reported PFAS detections (63.5%). 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
152
Total Violations
61
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
57
County
Litchfield
School/Daycare
No
MCL Violations
0
Monitoring Violations
53
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MR 4 1989
Total Haloacetic Acids (HAA5) MR 4 2004
TTHM MR 4 2004
Consumer Confidence Rule Other 4 2018
1,2,4-Trichlorobenzene MR 2 2004
cis-1,2-Dichloroethylene MR 2 2004
DICHLOROMETHANE MR 2 2004
p-Dichlorobenzene MR 2 2004
Vinyl chloride MR 2 2004
1,1-Dichloroethylene MR 2 2004
1,1,1-Trichloroethane MR 2 2004
Carbon tetrachloride MR 2 2004
1,2-Dichloropropane MR 2 2004
Trichloroethylene MR 2 2004
Tetrachloroethylene MR 2 2004
CHLOROBENZENE MR 2 2004
Benzene MR 2 2004
Ethylbenzene MR 2 2004
1,1,2-Trichloroethane MR 2 2004
o-Dichlorobenzene MR 2 2004
trans-1,2-Dichloroethylene MR 2 2004
Styrene MR 2 2004
1,2-Dichloroethane MR 2 2004
Toluene MR 2 2004
Lead and Copper Rule MR 1 2021
Public Notice Other 1 2006

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 AQUARION-TWIN OAKS.

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 CT0968011 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
2021 Lead and Copper Rule MR 1 SDWIS / CT0968011 / 5000
2018 Consumer Confidence Rule Other 4 SDWIS / CT0968011 / 7000
2006 Public Notice Other 1 SDWIS / CT0968011 / 7500
2004 Total Haloacetic Acids (HAA5) MR 4 SDWIS / CT0968011 / 2456
2004 TTHM MR 4 SDWIS / CT0968011 / 2950
2004 1,2,4-Trichlorobenzene MR 2 SDWIS / CT0968011 / 2378
2004 cis-1,2-Dichloroethylene MR 2 SDWIS / CT0968011 / 2380
2004 DICHLOROMETHANE MR 2 SDWIS / CT0968011 / 2964
2004 p-Dichlorobenzene MR 2 SDWIS / CT0968011 / 2969
2004 Vinyl chloride MR 2 SDWIS / CT0968011 / 2976
2004 1,1-Dichloroethylene MR 2 SDWIS / CT0968011 / 2977
2004 1,1,1-Trichloroethane MR 2 SDWIS / CT0968011 / 2981
2004 Carbon tetrachloride MR 2 SDWIS / CT0968011 / 2982
2004 1,2-Dichloropropane MR 2 SDWIS / CT0968011 / 2983
2004 Trichloroethylene MR 2 SDWIS / CT0968011 / 2984

How AQUARION-TWIN OAKS Compares

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

Metric AQUARION-TWIN OAKS Connecticut avg Federal benchmark
Total violations 61 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 152 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is AQUARION-TWIN OAKS water safe to drink? ▼
AQUARION-TWIN OAKS (PWS ID: CT0968011) has 61 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 152 people using Groundwater sources.
How many people does AQUARION-TWIN OAKS serve? ▼
AQUARION-TWIN OAKS serves 152 people in SHELTON, Connecticut. It is a Private-owned system using Groundwater water sources with 57 service connections.
What type of violations does AQUARION-TWIN OAKS have? ▼
AQUARION-TWIN OAKS has 61 total violations: 0 health-based violations (MCL exceedances or treatment failures), 53 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in AQUARION-TWIN OAKS water? ▼
No PFAS testing data is available for AQUARION-TWIN OAKS under the EPA's UCMR5 monitoring program.
What water source does AQUARION-TWIN OAKS use? ▼
AQUARION-TWIN OAKS 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.

Explore PlainWater

Water in Connecticut

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for Connecticut

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
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.

Related

Browse all → | Rankings →
Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial