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Non-Transient Non-Community Water System · PWS CT0609073

Melissa Jones School

Guilford, Connecticut 06437 - drinking water served from groundwater sources to 484 people, tracked in EPA SDWIS and UCMR5.

484
People served
79
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 79 drinking-water violations at Melissa Jones School - below the Connecticut per-system average.

79
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
484
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Melissa Jones School

Melissa Jones School is a local-owned non-transient non-community water system that delivers drinking water to 484 residents in Guilford, Connecticut (New Haven County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 79 total violations for this system , of which 0 (0%) 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 2025.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 9 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%).

Melissa Jones School's 79 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
484
Total Violations
79
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
New Haven
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
79
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 9 2025
Nitrate MR 4 2004
Nitrite MR 4 2004
Endrin MR 2 2016
Toxaphene MR 2 2016
Dalapon MR 2 2016
Di(2-ethylhexyl) adipate MR 2 2016
Simazine MR 2 2016
Aldicarb sulfone MR 2 2016
Carbofuran MR 2 2016
Aldicarb MR 2 2016
Atrazine MR 2 2016
Heptachlor MR 2 2016
2,4,5-TP MR 2 2016
Benzo(a)pyrene MR 2 2016
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2016
Chlordane MR 2 2016
Dinoseb MR 2 2016
ETHYLENE DIBROMIDE MR 2 2016
OXAMYL MR 2 2016
Hexachlorocyclopentadiene MR 2 2016
BHC-GAMMA MR 2 2016
Picloram MR 2 2016
Glyphosate MR 2 2016
Pentachlorophenol MR 2 2016
LASSO MR 2 2016
Heptachlor epoxide MR 2 2016
Total Polychlorinated Biphenyls (PCB) MR 2 2016
HEXACHLOROBENZENE MR 2 2016
Aldicarb sulfoxide MR 2 2016

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 Melissa Jones 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 CT0609073 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 9 SDWIS / CT0609073 / 5000
2016 Endrin MR 2 SDWIS / CT0609073 / 2005
2016 Toxaphene MR 2 SDWIS / CT0609073 / 2020
2016 Dalapon MR 2 SDWIS / CT0609073 / 2031
2016 Di(2-ethylhexyl) adipate MR 2 SDWIS / CT0609073 / 2035
2016 Simazine MR 2 SDWIS / CT0609073 / 2037
2016 Aldicarb sulfone MR 2 SDWIS / CT0609073 / 2044
2016 Carbofuran MR 2 SDWIS / CT0609073 / 2046
2016 Aldicarb MR 2 SDWIS / CT0609073 / 2047
2016 Atrazine MR 2 SDWIS / CT0609073 / 2050
2016 Heptachlor MR 2 SDWIS / CT0609073 / 2065
2016 2,4,5-TP MR 2 SDWIS / CT0609073 / 2110
2016 Benzo(a)pyrene MR 2 SDWIS / CT0609073 / 2306
2016 1,2-DIBROMO-3-CHLOROPROPANE MR 2 SDWIS / CT0609073 / 2931
2016 Chlordane MR 2 SDWIS / CT0609073 / 2959

How Melissa Jones School Compares

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

Metric Melissa Jones School Connecticut avg Federal benchmark
Total violations 79 88.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 484 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 Melissa Jones School water safe to drink? ▼
Melissa Jones School (PWS ID: CT0609073) has 79 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 484 people using Groundwater sources.
How many people does Melissa Jones School serve? ▼
Melissa Jones School serves 484 people in Guilford, Connecticut. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Melissa Jones School have? ▼
Melissa Jones School has 79 total violations: 0 health-based violations (MCL exceedances or treatment failures), 79 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Melissa Jones School water? ▼
No PFAS testing data is available for Melissa Jones School under the EPA's UCMR5 monitoring program.
What water source does Melissa Jones School use? ▼
Melissa Jones 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.