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Community Water System · PWS CT0930011

Regional Water Authority

New Haven, Connecticut 06511 - drinking water served from surface water sources to 418,900 people, tracked in EPA SDWIS and UCMR5.

418,900
People served
62
EPA violations
0
Health-based
4 PFAS
UCMR5 result

The verdict

EPA records 62 drinking-water violations at Regional Water Authority - below the Connecticut per-system average, and UCMR5 testing detected 4 PFAS compounds.

62
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
418,900
People served by this system
4
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Regional Water Authority

Regional Water Authority is a local-owned community water system that delivers drinking water to 418,900 residents in New Haven, Connecticut (New Haven County) through 115,707 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 62 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 53 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 Consumer Confidence Rule, recorded in 4 violations (Other). Under EPA's UCMR5 PFAS monitoring program, 4 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 10.7 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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%).

Regional Water Authority's 62 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.

PFAS Detected

4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
418,900
Total Violations
62
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
115,707
County
New Haven
School/Daycare
No
MCL Violations
0
Monitoring Violations
53
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 4 2015
Nitrate MR 4 2015
Nitrite MR 4 2015
1,2,4-Trichlorobenzene MR 2 2015
cis-1,2-Dichloroethylene MR 2 2015
DICHLOROMETHANE MR 2 2015
p-Dichlorobenzene MR 2 2015
Vinyl chloride MR 2 2015
1,1-Dichloroethylene MR 2 2015
Carbon tetrachloride MR 2 2015
1,2-Dichloropropane MR 2 2015
Trichloroethylene MR 2 2015
Toluene MR 2 2015
Ethylbenzene MR 2 2015
Styrene MR 2 2015
Tetrachloroethylene MR 2 2015
trans-1,2-Dichloroethylene MR 2 2015
1,2-Dichloroethane MR 2 2015
CHLOROBENZENE MR 2 2015
Lead and Copper Rule MR 2 2020
1,1,1-Trichloroethane MR 2 2015
o-Dichlorobenzene MR 2 2015
1,1,2-Trichloroethane MR 2 2015
Benzene MR 2 2015
Total Haloacetic Acids (HAA5) MR 1 2014
CARBON, TOTAL MR 1 2017
TTHM MR 1 2014

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 15 of 870 samples detected PFAS.

Contaminant Date Result MRL Status
PFBS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 9/27/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 9/27/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFOA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/27/2023 <6.00 ppt 6.00 ppt Not Detected
8:2 FTS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 9/27/2023 <7.00 ppt 7.00 ppt Not Detected
PFTA 9/27/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
NFDHA 9/27/2023 <20.00 ppt 20.00 ppt Not Detected
PFMBA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/20/2023 <2.00 ppt 2.00 ppt Not Detected
PFMPA 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 9/20/2023 6.30 ppt 4.00 ppt Detected
8:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 9/20/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/20/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 9/20/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/20/2023 <6.00 ppt 6.00 ppt Not Detected
NFDHA 9/20/2023 <20.00 ppt 20.00 ppt Not Detected
4:2 FTS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/20/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/20/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/20/2023 3.40 ppt 3.00 ppt Detected
PFOS 9/20/2023 8.10 ppt 4.00 ppt Detected
6:2 FTS 9/20/2023 <5.00 ppt 5.00 ppt Not Detected

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 Regional Water Authority.

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 CT0930011 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 2 SDWIS / CT0930011 / 5000
2017 CARBON, TOTAL MR 1 SDWIS / CT0930011 / 2920
2015 Consumer Confidence Rule Other 4 SDWIS / CT0930011 / 7000
2015 Nitrate MR 4 SDWIS / CT0930011 / 1040
2015 Nitrite MR 4 SDWIS / CT0930011 / 1041
2015 1,2,4-Trichlorobenzene MR 2 SDWIS / CT0930011 / 2378
2015 cis-1,2-Dichloroethylene MR 2 SDWIS / CT0930011 / 2380
2015 DICHLOROMETHANE MR 2 SDWIS / CT0930011 / 2964
2015 p-Dichlorobenzene MR 2 SDWIS / CT0930011 / 2969
2015 Vinyl chloride MR 2 SDWIS / CT0930011 / 2976
2015 1,1-Dichloroethylene MR 2 SDWIS / CT0930011 / 2977
2015 Carbon tetrachloride MR 2 SDWIS / CT0930011 / 2982
2015 1,2-Dichloropropane MR 2 SDWIS / CT0930011 / 2983
2015 Trichloroethylene MR 2 SDWIS / CT0930011 / 2984
2015 Toluene MR 2 SDWIS / CT0930011 / 2991

How Regional Water Authority Compares

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

Metric Regional Water Authority Connecticut avg Federal benchmark
Total violations 62 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 4 compounds 63.5% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 418,900 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 Regional Water Authority water safe to drink? ▼
Regional Water Authority (PWS ID: CT0930011) has 62 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 4 PFAS compounds found. This system serves 418,900 people using Surface Water sources.
How many people does Regional Water Authority serve? ▼
Regional Water Authority serves 418,900 people in New Haven, Connecticut. It is a Local-owned system using Surface Water water sources with 115,707 service connections.
What type of violations does Regional Water Authority have? ▼
Regional Water Authority has 62 total violations: 0 health-based violations (MCL exceedances or treatment failures), 53 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Regional Water Authority water? ▼
Yes. UCMR5 testing detected 4 PFAS compounds in Regional Water Authority's water supply: PFOA, PFBS, PFOS, PFPeA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Regional Water Authority use? ▼
Regional Water Authority uses Surface Water 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.