PlainWater
States → Connecticut

HAWTHORNE TERRACE ASSOC

PWS ID: CT0340151 · DANBURY, Connecticut 06810

HAWTHORNE TERRACE ASSOC serves 156 people in DANBURY, Connecticut using Groundwater water sources. It has 170 recorded EPA violations, including 8 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: HAWTHORNE TERRACE ASSOC

HAWTHORNE TERRACE ASSOC is a local-owned community water system that delivers drinking water to 156 residents in DANBURY, Connecticut (Fairfield County) through 39 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 170 total violations for this system , of which 8 (5%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 144 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 56 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. HAWTHORNE TERRACE ASSOC's 170 violations sit above 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
156
Total Violations
170
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
39
County
Fairfield
School/Daycare
No
MCL Violations
0
Monitoring Violations
144
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 56 2025
Consumer Confidence Rule Other 16 2019
Coliform (TCR) MR 10 1998
Lead and Copper Rule TT 8 2015
Combined Radium (-226 and -228) MR 6 2013
Gross Alpha, Excl. Radon and U MR 4 2013
Combined Uranium MR 4 2013
Endrin MR 2 2015
Methoxychlor MR 2 2015
Toxaphene MR 2 2015
Glyphosate MR 2 2015
Di(2-ethylhexyl) adipate MR 2 2015
OXAMYL MR 2 2015
Dinoseb MR 2 2015
Aldicarb sulfoxide MR 2 2015
Carbofuran MR 2 2015
Atrazine MR 2 2015
2,4-D MR 2 2015
HEXACHLOROBENZENE MR 2 2015
Benzo(a)pyrene MR 2 2015
Pentachlorophenol MR 2 2015
Total Polychlorinated Biphenyls (PCB) MR 2 2015
Chlordane MR 2 2015
Asbestos MR 2 2013
Dalapon MR 2 2015
Hexachlorocyclopentadiene MR 2 2015
LASSO MR 2 2015
BHC-GAMMA MR 2 2015
Picloram MR 2 2015
Aldicarb sulfone MR 2 2015

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 HAWTHORNE TERRACE ASSOC.

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 CT0340151 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
2025 Lead and Copper Rule MR 56 SDWIS / CT0340151 / 5000
2019 Consumer Confidence Rule Other 16 SDWIS / CT0340151 / 7000
2015 Lead and Copper Rule TT 8 SDWIS / CT0340151 / 5000
2015 Endrin MR 2 SDWIS / CT0340151 / 2005
2015 Methoxychlor MR 2 SDWIS / CT0340151 / 2015
2015 Toxaphene MR 2 SDWIS / CT0340151 / 2020
2015 Glyphosate MR 2 SDWIS / CT0340151 / 2034
2015 Di(2-ethylhexyl) adipate MR 2 SDWIS / CT0340151 / 2035
2015 OXAMYL MR 2 SDWIS / CT0340151 / 2036
2015 Dinoseb MR 2 SDWIS / CT0340151 / 2041
2015 Aldicarb sulfoxide MR 2 SDWIS / CT0340151 / 2043
2015 Carbofuran MR 2 SDWIS / CT0340151 / 2046
2015 Atrazine MR 2 SDWIS / CT0340151 / 2050
2015 2,4-D MR 2 SDWIS / CT0340151 / 2105
2015 HEXACHLOROBENZENE MR 2 SDWIS / CT0340151 / 2274

How HAWTHORNE TERRACE ASSOC Compares

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

Metric HAWTHORNE TERRACE ASSOC Connecticut avg Federal benchmark
Total violations 170 88.6 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 8 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 156 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 HAWTHORNE TERRACE ASSOC water safe to drink? ▼
HAWTHORNE TERRACE ASSOC (PWS ID: CT0340151) has 170 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 156 people using Groundwater sources.
How many people does HAWTHORNE TERRACE ASSOC serve? ▼
HAWTHORNE TERRACE ASSOC serves 156 people in DANBURY, Connecticut. It is a Local-owned system using Groundwater water sources with 39 service connections.
What type of violations does HAWTHORNE TERRACE ASSOC have? ▼
HAWTHORNE TERRACE ASSOC has 170 total violations: 8 health-based violations (MCL exceedances or treatment failures), 144 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in HAWTHORNE TERRACE ASSOC water? ▼
No PFAS testing data is available for HAWTHORNE TERRACE ASSOC under the EPA's UCMR5 monitoring program.
What water source does HAWTHORNE TERRACE ASSOC use? ▼
HAWTHORNE TERRACE ASSOC 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