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Non-Transient Non-Community Water System · PWS CT0570202

Whitby School

Greenwich, Connecticut 06830 - drinking water served from groundwater sources to 350 people, tracked in EPA SDWIS and UCMR5.

350
People served
633
EPA violations
16
Health-based
Untested
UCMR5 result

The verdict

EPA records 633 drinking-water violations at Whitby School, 3% of them health-based - above the Connecticut per-system average.

633
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
350
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Whitby School

Whitby School is a private-owned non-transient non-community water system that delivers drinking water to 350 residents in Greenwich, Connecticut (Fairfield County) through 3 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 633 total violations for this system , of which 16 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 603 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 41 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%).

Whitby School's 633 violations sit above 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
350
Total Violations
633
Health-Based Violations
16
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
3
County
Fairfield
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
603
Treatment Tech Violations
16

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 41 2024
Groundwater Rule MR 32 2018
1,2,4-Trichlorobenzene MR 12 2017
cis-1,2-Dichloroethylene MR 12 2017
DICHLOROMETHANE MR 12 2017
Vinyl chloride MR 12 2017
trans-1,2-Dichloroethylene MR 12 2017
1,2-Dichloroethane MR 12 2017
1,2-Dichloropropane MR 12 2017
Trichloroethylene MR 12 2017
1,1,2-Trichloroethane MR 12 2017
Tetrachloroethylene MR 12 2017
CHLOROBENZENE MR 12 2017
Benzene MR 12 2017
Toluene MR 12 2017
Ethylbenzene MR 12 2017
Styrene MR 12 2017
o-Dichlorobenzene MR 12 2017
p-Dichlorobenzene MR 12 2017
1,1-Dichloroethylene MR 12 2017
1,1,1-Trichloroethane MR 12 2017
Groundwater Rule TT 12 2018
Carbon tetrachloride MR 12 2017
Public Notice Other 8 2019
BHC-GAMMA MR 8 2017
Methoxychlor MR 8 2017
Toxaphene MR 8 2017
Dalapon MR 8 2017
Di(2-ethylhexyl) adipate MR 8 2017
Di(2-ethylhexyl) phthalate MR 8 2017

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 Whitby School.

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 CT0570202 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
2024 Lead and Copper Rule MR 41 SDWIS / CT0570202 / 5000
2019 Public Notice Other 8 SDWIS / CT0570202 / 7500
2018 Groundwater Rule MR 32 SDWIS / CT0570202 / 0700
2018 Groundwater Rule TT 12 SDWIS / CT0570202 / 0700
2017 1,2,4-Trichlorobenzene MR 12 SDWIS / CT0570202 / 2378
2017 cis-1,2-Dichloroethylene MR 12 SDWIS / CT0570202 / 2380
2017 DICHLOROMETHANE MR 12 SDWIS / CT0570202 / 2964
2017 Vinyl chloride MR 12 SDWIS / CT0570202 / 2976
2017 trans-1,2-Dichloroethylene MR 12 SDWIS / CT0570202 / 2979
2017 1,2-Dichloroethane MR 12 SDWIS / CT0570202 / 2980
2017 1,2-Dichloropropane MR 12 SDWIS / CT0570202 / 2983
2017 Trichloroethylene MR 12 SDWIS / CT0570202 / 2984
2017 1,1,2-Trichloroethane MR 12 SDWIS / CT0570202 / 2985
2017 Tetrachloroethylene MR 12 SDWIS / CT0570202 / 2987
2017 CHLOROBENZENE MR 12 SDWIS / CT0570202 / 2989

How Whitby School Compares

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

Metric Whitby School Connecticut avg Federal benchmark
Total violations 633 88.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 16 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 350 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 Whitby School water safe to drink? ▼
Whitby School (PWS ID: CT0570202) has 633 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 350 people using Groundwater sources.
How many people does Whitby School serve? ▼
Whitby School serves 350 people in Greenwich, Connecticut. It is a Private-owned system using Groundwater water sources with 3 service connections.
What type of violations does Whitby School have? ▼
Whitby School has 633 total violations: 16 health-based violations (MCL exceedances or treatment failures), 603 monitoring/reporting violations, and 16 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Whitby School water? ▼
No PFAS testing data is available for Whitby School under the EPA's UCMR5 monitoring program.
What water source does Whitby School use? ▼
Whitby School 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.
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.