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Non-Transient Non-Community Water System · PWS CT0691243

Killingly High School & Agricultural Ctr

Dayville, Connecticut 06241 - drinking water served from groundwater sources to 1,400 people, tracked in EPA SDWIS and UCMR5.

1,400
People served
128
EPA violations
51
Health-based
Untested
UCMR5 result

The verdict

EPA records 128 drinking-water violations at Killingly High School & Agricultural Ctr, 40% of them health-based - above the Connecticut per-system average.

128
Total EPA violations on record
40%
Health-based (MCL / treatment failure)
1,400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Killingly High School & Agricultural Ctr

Killingly High School & Agricultural Ctr is a local-owned non-transient non-community water system that delivers drinking water to 1,400 residents in Dayville, Connecticut (Windham County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 128 total violations for this system , of which 51 (40%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 65 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 Groundwater Rule, recorded in 50 violations (TT, health-based). 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%).

Killingly High School & Agricultural Ctr's 128 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
1,400
Total Violations
128
Health-Based Violations
51
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Windham
School/Daycare
No
MCL Violations
0
Monitoring Violations
65
Treatment Tech Violations
51

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Groundwater Rule TT 50 2019
Chlorine MR 28 2024
Groundwater Rule MR 19 2023
Revised Total Coliform Rule MON 16 2023
Public Notice Other 2 2012
Lead and Copper Rule MR 2 2020
LEAD AND COPPER RULE REVISIONS TT 1 2024
LEAD AND COPPER RULE REVISIONS RPT 1 2024

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 Killingly High School & Agricultural Ctr.

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 CT0691243 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 Chlorine MR 28 SDWIS / CT0691243 / 0999
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / CT0691243 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / CT0691243 / 5200
2023 Groundwater Rule MR 19 SDWIS / CT0691243 / 0700
2023 Revised Total Coliform Rule MON 16 SDWIS / CT0691243 / 8000
2020 Lead and Copper Rule MR 2 SDWIS / CT0691243 / 5000
2019 Groundwater Rule TT 50 SDWIS / CT0691243 / 0700
2012 Public Notice Other 2 SDWIS / CT0691243 / 7500

How Killingly High School & Agricultural Ctr Compares

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

Metric Killingly High School & Agricultural Ctr Connecticut avg Federal benchmark
Total violations 128 88.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 51 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 1,400 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 Killingly High School & Agricultural Ctr water safe to drink? ▼
Killingly High School & Agricultural Ctr (PWS ID: CT0691243) has 128 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,400 people using Groundwater sources.
How many people does Killingly High School & Agricultural Ctr serve? ▼
Killingly High School & Agricultural Ctr serves 1,400 people in Dayville, Connecticut. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Killingly High School & Agricultural Ctr have? ▼
Killingly High School & Agricultural Ctr has 128 total violations: 51 health-based violations (MCL exceedances or treatment failures), 65 monitoring/reporting violations, and 51 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Killingly High School & Agricultural Ctr water? ▼
No PFAS testing data is available for Killingly High School & Agricultural Ctr under the EPA's UCMR5 monitoring program.
What water source does Killingly High School & Agricultural Ctr use? ▼
Killingly High School & Agricultural Ctr 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.