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Community Water System · PWS CT0579143

Brunswick School (Lower & Lower Middle)

Greenwich, Connecticut 06831 - drinking water served from groundwater sources to 567 people, tracked in EPA SDWIS and UCMR5.

567
People served
85
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 85 drinking-water violations at Brunswick School (Lower & Lower Middle), 2% of them health-based - below the Connecticut per-system average.

85
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
567
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Brunswick School (Lower & Lower Middle)

Brunswick School (Lower & Lower Middle) is a private-owned community water system that delivers drinking water to 567 residents in Greenwich, Connecticut (Fairfield County) through 12 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 85 total violations for this system , of which 2 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 79 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 15 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%).

Brunswick School (Lower & Lower Middle)'s 85 violations sit below 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
567
Total Violations
85
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
12
County
Fairfield
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
79
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 15 2015
Chlorine MR 12 2015
Lead and Copper Rule MR 6 2020
CYANIDE MR 3 2000
Consumer Confidence Rule Other 3 2016
Fluoride MR 3 2000
Lead and Copper Rule TT 2 2001
cis-1,2-Dichloroethylene MR 2 2019
DICHLOROMETHANE MR 2 2019
o-Dichlorobenzene MR 2 2019
p-Dichlorobenzene MR 2 2019
Vinyl chloride MR 2 2019
1,1-Dichloroethylene MR 2 2019
1,1,1-Trichloroethane MR 2 2019
Carbon tetrachloride MR 2 2019
1,2-Dichloropropane MR 2 2019
Tetrachloroethylene MR 2 2019
CHLOROBENZENE MR 2 2019
Benzene MR 2 2019
Toluene MR 2 2019
Ethylbenzene MR 2 2019
Styrene MR 2 2019
trans-1,2-Dichloroethylene MR 2 2019
1,2-Dichloroethane MR 2 2019
1,1,2-Trichloroethane MR 2 2019
1,2,4-Trichlorobenzene MR 2 2019
Trichloroethylene MR 2 2019

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 Brunswick School (Lower & Lower Middle).

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 CT0579143 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
2020 Lead and Copper Rule MR 6 SDWIS / CT0579143 / 5000
2019 cis-1,2-Dichloroethylene MR 2 SDWIS / CT0579143 / 2380
2019 DICHLOROMETHANE MR 2 SDWIS / CT0579143 / 2964
2019 o-Dichlorobenzene MR 2 SDWIS / CT0579143 / 2968
2019 p-Dichlorobenzene MR 2 SDWIS / CT0579143 / 2969
2019 Vinyl chloride MR 2 SDWIS / CT0579143 / 2976
2019 1,1-Dichloroethylene MR 2 SDWIS / CT0579143 / 2977
2019 1,1,1-Trichloroethane MR 2 SDWIS / CT0579143 / 2981
2019 Carbon tetrachloride MR 2 SDWIS / CT0579143 / 2982
2019 1,2-Dichloropropane MR 2 SDWIS / CT0579143 / 2983
2019 Tetrachloroethylene MR 2 SDWIS / CT0579143 / 2987
2019 CHLOROBENZENE MR 2 SDWIS / CT0579143 / 2989
2019 Benzene MR 2 SDWIS / CT0579143 / 2990
2019 Toluene MR 2 SDWIS / CT0579143 / 2991
2019 Ethylbenzene MR 2 SDWIS / CT0579143 / 2992

How Brunswick School (Lower & Lower Middle) Compares

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

Metric Brunswick School (Lower & Lower Middle) Connecticut avg Federal benchmark
Total violations 85 88.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 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 567 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 Brunswick School (Lower & Lower Middle) water safe to drink? ▼
Brunswick School (Lower & Lower Middle) (PWS ID: CT0579143) has 85 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 567 people using Groundwater sources.
How many people does Brunswick School (Lower & Lower Middle) serve? ▼
Brunswick School (Lower & Lower Middle) serves 567 people in Greenwich, Connecticut. It is a Private-owned system using Groundwater water sources with 12 service connections.
What type of violations does Brunswick School (Lower & Lower Middle) have? ▼
Brunswick School (Lower & Lower Middle) has 85 total violations: 2 health-based violations (MCL exceedances or treatment failures), 79 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Brunswick School (Lower & Lower Middle) water? ▼
No PFAS testing data is available for Brunswick School (Lower & Lower Middle) under the EPA's UCMR5 monitoring program.
What water source does Brunswick School (Lower & Lower Middle) use? ▼
Brunswick School (Lower & Lower Middle) 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.