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STERLING ENGINEERING CORP.

PWS ID: CT0050062 · BARKHAMSTED, Connecticut 06063

STERLING ENGINEERING CORP. serves 110 people in BARKHAMSTED, Connecticut using Groundwater water sources. It has 27 recorded EPA violations, including 0 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: STERLING ENGINEERING CORP.

STERLING ENGINEERING CORP. is a private-owned non-transient non-community water system that delivers drinking water to 110 residents in BARKHAMSTED, Connecticut (Litchfield County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 27 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 26 monitoring and reporting violations are on file. The most recent violation on record dates to 2005.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 14 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. STERLING ENGINEERING CORP.'s 27 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
110
Total Violations
27
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
2
County
Litchfield
School/Daycare
No
MCL Violations
0
Monitoring Violations
26
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 14 2001
Lead and Copper Rule MR 12 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
NFDHA 8/28/2023 <0.02 µg/L 0.02 µg/L Not Detected
ADONA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
11Cl-PF3OUdS 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/28/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFMBA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/28/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFTA 8/28/2023 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 8/28/2023 <0.007 µg/L 0.007 µg/L Not Detected
NMeFOSAA 8/28/2023 <0.006 µg/L 0.006 µg/L Not Detected
lithium 8/28/2023 <9 µg/L 9 µg/L Not Detected
PFHpA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 8/28/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/28/2023 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 8/28/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 2/8/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFUnA 2/8/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFNA 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 2/8/2023 <0.008 µg/L 0.008 µg/L Not Detected
NEtFOSAA 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 2/8/2023 <0.006 µg/L 0.006 µg/L Not Detected
11Cl-PF3OUdS 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 2/8/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 2/8/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 2/8/2023 <9 µg/L 9 µg/L Not Detected
PFPeS 2/8/2023 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 2/8/2023 <0.02 µg/L 0.02 µg/L Not Detected

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 STERLING ENGINEERING CORP..

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 CT0050062 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
2005 Lead and Copper Rule MR 12 SDWIS / CT0050062 / 5000
2001 Coliform (TCR) MR 14 SDWIS / CT0050062 / 3100

How STERLING ENGINEERING CORP. Compares

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

Metric STERLING ENGINEERING CORP. Connecticut avg Federal benchmark
Total violations 27 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 110 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 STERLING ENGINEERING CORP. water safe to drink? ▼
STERLING ENGINEERING CORP. (PWS ID: CT0050062) has 27 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 110 people using Groundwater sources.
How many people does STERLING ENGINEERING CORP. serve? ▼
STERLING ENGINEERING CORP. serves 110 people in BARKHAMSTED, Connecticut. It is a Private-owned system using Groundwater water sources with 2 service connections.
What type of violations does STERLING ENGINEERING CORP. have? ▼
STERLING ENGINEERING CORP. has 27 total violations: 0 health-based violations (MCL exceedances or treatment failures), 26 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in STERLING ENGINEERING CORP. water? ▼
No. STERLING ENGINEERING CORP. was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does STERLING ENGINEERING CORP. use? ▼
STERLING ENGINEERING CORP. uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

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

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