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THE GRUMMAN HILL MONTESSORI ASSOCIATION

PWS ID: CT1615113 · WILTON, Connecticut 06897

THE GRUMMAN HILL MONTESSORI ASSOCIATION serves 259 people in WILTON, Connecticut using Groundwater water sources. It has 116 recorded EPA violations, including 26 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: THE GRUMMAN HILL MONTESSORI ASSOCIATION

THE GRUMMAN HILL MONTESSORI ASSOCIATION is a private-owned non-transient non-community water system that delivers drinking water to 259 residents in WILTON, Connecticut (Fairfield County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 116 total violations for this system , of which 26 (22%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 80 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 40 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. THE GRUMMAN HILL MONTESSORI ASSOCIATION's 116 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
259
Total Violations
116
Health-Based Violations
26
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Fairfield
School/Daycare
Yes
MCL Violations
10
Monitoring Violations
80
Treatment Tech Violations
16

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 40 2022
Lead and Copper Rule TT 16 2016
Coliform (TCR) MCL 10 2007
Public Notice Other 4 2010
DICHLOROMETHANE MR 2 2010
o-Dichlorobenzene MR 2 2010
Vinyl chloride MR 2 2010
1,1-Dichloroethylene MR 2 2010
Carbon tetrachloride MR 2 2010
Tetrachloroethylene MR 2 2010
Benzene MR 2 2010
Toluene MR 2 2010
Ethylbenzene MR 2 2010
Styrene MR 2 2010
cis-1,2-Dichloroethylene MR 2 2010
1,2-Dichloropropane MR 2 2010
1,1,1-Trichloroethane MR 2 2010
trans-1,2-Dichloroethylene MR 2 2010
CHLOROBENZENE MR 2 2010
1,2-Dichloroethane MR 2 2010
Trichloroethylene MR 2 2010
p-Dichlorobenzene MR 2 2010
1,2,4-Trichlorobenzene MR 2 2010
1,1,2-Trichloroethane MR 2 2010

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 THE GRUMMAN HILL MONTESSORI ASSOCIATION.

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 CT1615113 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
2022 Lead and Copper Rule MR 40 SDWIS / CT1615113 / 5000
2016 Lead and Copper Rule TT 16 SDWIS / CT1615113 / 5000
2010 Public Notice Other 4 SDWIS / CT1615113 / 7500
2010 DICHLOROMETHANE MR 2 SDWIS / CT1615113 / 2964
2010 o-Dichlorobenzene MR 2 SDWIS / CT1615113 / 2968
2010 Vinyl chloride MR 2 SDWIS / CT1615113 / 2976
2010 1,1-Dichloroethylene MR 2 SDWIS / CT1615113 / 2977
2010 Carbon tetrachloride MR 2 SDWIS / CT1615113 / 2982
2010 Tetrachloroethylene MR 2 SDWIS / CT1615113 / 2987
2010 Benzene MR 2 SDWIS / CT1615113 / 2990
2010 Toluene MR 2 SDWIS / CT1615113 / 2991
2010 Ethylbenzene MR 2 SDWIS / CT1615113 / 2992
2010 Styrene MR 2 SDWIS / CT1615113 / 2996
2010 cis-1,2-Dichloroethylene MR 2 SDWIS / CT1615113 / 2380
2010 1,2-Dichloropropane MR 2 SDWIS / CT1615113 / 2983

How THE GRUMMAN HILL MONTESSORI ASSOCIATION Compares

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

Metric THE GRUMMAN HILL MONTESSORI ASSOCIATION Connecticut avg Federal benchmark
Total violations 116 88.6 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 26 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 259 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 THE GRUMMAN HILL MONTESSORI ASSOCIATION water safe to drink? ▼
THE GRUMMAN HILL MONTESSORI ASSOCIATION (PWS ID: CT1615113) has 116 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 259 people using Groundwater sources.
How many people does THE GRUMMAN HILL MONTESSORI ASSOCIATION serve? ▼
THE GRUMMAN HILL MONTESSORI ASSOCIATION serves 259 people in WILTON, Connecticut. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does THE GRUMMAN HILL MONTESSORI ASSOCIATION have? ▼
THE GRUMMAN HILL MONTESSORI ASSOCIATION has 116 total violations: 26 health-based violations (MCL exceedances or treatment failures), 80 monitoring/reporting violations, and 16 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in THE GRUMMAN HILL MONTESSORI ASSOCIATION water? ▼
No PFAS testing data is available for THE GRUMMAN HILL MONTESSORI ASSOCIATION under the EPA's UCMR5 monitoring program.
What water source does THE GRUMMAN HILL MONTESSORI ASSOCIATION use? ▼
THE GRUMMAN HILL MONTESSORI ASSOCIATION 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. This data is provided for informational purposes only.

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

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