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Community Water System · PWS MA4018000

Town of Avon

Avon, Massachusetts 02322 - drinking water served from groundwater sources to 4,777 people, tracked in EPA SDWIS and UCMR5.

4,777
People served
92
EPA violations
10
Health-based
2 PFAS
UCMR5 result

The verdict

EPA records 92 drinking-water violations at Town of Avon, 11% of them health-based - above the Massachusetts per-system average, and UCMR5 testing detected 2 PFAS compounds.

92
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
4,777
People served by this system
2
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Town of Avon

Town of Avon is a local-owned community water system that delivers drinking water to 4,777 residents in Avon, Massachusetts (Norfolk County) through 1,689 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 92 total violations for this system , of which 10 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 75 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 4 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 2 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 6 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across Massachusetts, EPA tracks 1,599 public water systems serving 10,332,845 people, with 73,886 cumulative violations and 7,389 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 46.2 violations. Statewide, 148 of 263 UCMR5-tested systems have reported PFAS detections (56.3%).

Town of Avon's 92 violations sit above the Massachusetts 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

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

Population Served
4,777
Total Violations
92
Health-Based Violations
10
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,689
County
Norfolk
School/Daycare
No
MCL Violations
4
Monitoring Violations
75
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 4 2010
Groundwater Rule TT 4 2016
p-Dichlorobenzene MR 2 2008
Vinyl chloride MR 2 2008
1,1-Dichloroethylene MR 2 2008
trans-1,2-Dichloroethylene MR 2 2008
1,1,1-Trichloroethane MR 2 2008
1,2-Dichloropropane MR 2 2008
Tetrachloroethylene MR 2 2008
CHLOROBENZENE MR 2 2008
Benzene MR 2 2008
Toluene MR 2 2008
Ethylbenzene MR 2 2008
o-Dichlorobenzene MR 2 2008
cis-1,2-Dichloroethylene MR 2 2008
DICHLOROMETHANE MR 2 2008
1,2,4-Trichlorobenzene MR 2 2008
1,2-Dichloroethane MR 2 2008
Lead and Copper Rule TT 2 1996
Carbon tetrachloride MR 2 2008
Styrene MR 2 2008
Consumer Confidence Rule Other 2 2015
Xylenes, Total MR 2 2008
1,1,2-Trichloroethane MR 2 2008
Trichloroethylene MR 2 2008
Lead and Copper Rule MR 2 2007
Coliform (TCR) MR 1 2003
Methoxychlor MR 1 2003
Toxaphene MR 1 2003
Diquat MR 1 2003

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
8:2 FTS 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 5/2/2023 5.00 ppt 4.00 ppt Detected
PFOA 5/2/2023 4.50 ppt 4.00 ppt Detected
PFDA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 5/2/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 5/2/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 5/2/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 5/2/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 5/2/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 5/2/2023 <6.00 ppt 6.00 ppt Not Detected
PFBA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 5/2/2023 <2.00 ppt 2.00 ppt Not Detected
PFHpA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 5/2/2023 <6.00 ppt 6.00 ppt Not Detected
PFHxS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 5/2/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 5/2/2023 <2.00 ppt 2.00 ppt Not Detected
ADONA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 5/2/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 5/2/2023 <7.00 ppt 7.00 ppt Not Detected
PFDoA 5/2/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 5/2/2023 <8.00 ppt 8.00 ppt Not Detected
PFPeS 5/2/2023 <4.00 ppt 4.00 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 Town of Avon.

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 MA4018000 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Massachusetts Drinking Water Authority

MassDEP, Drinking Water Program is the primacy agency that licenses and inspects Town of Avon under EPA-delegated authority.

Open MA regulator portal

Source: MassDEP, Drinking Water Program

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
2016 Groundwater Rule TT 4 SDWIS / MA4018000 / 0700
2015 Consumer Confidence Rule Other 2 SDWIS / MA4018000 / 7000
2010 Coliform (TCR) MCL 4 SDWIS / MA4018000 / 3100
2008 p-Dichlorobenzene MR 2 SDWIS / MA4018000 / 2969
2008 Vinyl chloride MR 2 SDWIS / MA4018000 / 2976
2008 1,1-Dichloroethylene MR 2 SDWIS / MA4018000 / 2977
2008 trans-1,2-Dichloroethylene MR 2 SDWIS / MA4018000 / 2979
2008 1,1,1-Trichloroethane MR 2 SDWIS / MA4018000 / 2981
2008 1,2-Dichloropropane MR 2 SDWIS / MA4018000 / 2983
2008 Tetrachloroethylene MR 2 SDWIS / MA4018000 / 2987
2008 CHLOROBENZENE MR 2 SDWIS / MA4018000 / 2989
2008 Benzene MR 2 SDWIS / MA4018000 / 2990
2008 Toluene MR 2 SDWIS / MA4018000 / 2991
2008 Ethylbenzene MR 2 SDWIS / MA4018000 / 2992
2008 o-Dichlorobenzene MR 2 SDWIS / MA4018000 / 2968

How Town of Avon Compares

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

Metric Town of Avon Massachusetts avg Federal benchmark
Total violations 92 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 10 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection 2 compounds 56.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 4,777 6,462 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,599 regulated public water systems in Massachusetts.

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 Town of Avon water safe to drink? ▼
Town of Avon (PWS ID: MA4018000) has 92 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 2 PFAS compounds found. This system serves 4,777 people using Groundwater sources.
How many people does Town of Avon serve? ▼
Town of Avon serves 4,777 people in Avon, Massachusetts. It is a Local-owned system using Groundwater water sources with 1,689 service connections.
What type of violations does Town of Avon have? ▼
Town of Avon has 92 total violations: 10 health-based violations (MCL exceedances or treatment failures), 75 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Town of Avon water? ▼
Yes. UCMR5 testing detected 2 PFAS compounds in Town of Avon's water supply: PFOS, PFOA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Town of Avon use? ▼
Town of Avon uses Groundwater 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.