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Non-Transient Non-Community Water System · PWS MA2179022

Imperial Plaza

Mendon, Massachusetts 01756 - drinking water served from groundwater sources to 200 people, tracked in EPA SDWIS and UCMR5.

200
People served
241
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 241 drinking-water violations at Imperial Plaza - above the Massachusetts per-system average.

241
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Imperial Plaza

Imperial Plaza is a private-owned non-transient non-community water system that delivers drinking water to 200 residents in Mendon, Massachusetts (Worcester County) through 4 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 241 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 235 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Vinyl chloride, recorded in 10 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 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%).

Imperial Plaza's 241 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.

Population Served
200
Total Violations
241
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
4
County
Worcester
School/Daycare
No
MCL Violations
0
Monitoring Violations
235
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Vinyl chloride MR 10 2014
CHLOROBENZENE MR 10 2014
trans-1,2-Dichloroethylene MR 10 2014
Ethylbenzene MR 10 2014
Styrene MR 10 2014
Toluene MR 10 2014
p-Dichlorobenzene MR 10 2014
Xylenes, Total MR 10 2014
1,1,2-Trichloroethane MR 10 2014
1,2,4-Trichlorobenzene MR 10 2014
1,2-Dichloroethane MR 10 2014
Trichloroethylene MR 10 2014
1,1,1-Trichloroethane MR 10 2014
o-Dichlorobenzene MR 10 2014
Coliform (TCR) MR 10 2014
Benzene MR 10 2014
1,1-Dichloroethylene MR 10 2014
1,2-Dichloropropane MR 10 2014
Tetrachloroethylene MR 10 2014
DICHLOROMETHANE MR 10 2014
cis-1,2-Dichloroethylene MR 10 2014
Carbon tetrachloride MR 10 2014
Lead and Copper Rule MR 7 2023
Revised Total Coliform Rule MON 6 2023
Nitrate MR 2 2014

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 Imperial Plaza.

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 MA2179022 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 Imperial Plaza 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
2023 Lead and Copper Rule MR 7 SDWIS / MA2179022 / 5000
2023 Revised Total Coliform Rule MON 6 SDWIS / MA2179022 / 8000
2014 Vinyl chloride MR 10 SDWIS / MA2179022 / 2976
2014 CHLOROBENZENE MR 10 SDWIS / MA2179022 / 2989
2014 trans-1,2-Dichloroethylene MR 10 SDWIS / MA2179022 / 2979
2014 Ethylbenzene MR 10 SDWIS / MA2179022 / 2992
2014 Styrene MR 10 SDWIS / MA2179022 / 2996
2014 Toluene MR 10 SDWIS / MA2179022 / 2991
2014 p-Dichlorobenzene MR 10 SDWIS / MA2179022 / 2969
2014 Xylenes, Total MR 10 SDWIS / MA2179022 / 2955
2014 1,1,2-Trichloroethane MR 10 SDWIS / MA2179022 / 2985
2014 1,2,4-Trichlorobenzene MR 10 SDWIS / MA2179022 / 2378
2014 1,2-Dichloroethane MR 10 SDWIS / MA2179022 / 2980
2014 Trichloroethylene MR 10 SDWIS / MA2179022 / 2984
2014 1,1,1-Trichloroethane MR 10 SDWIS / MA2179022 / 2981

How Imperial Plaza Compares

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

Metric Imperial Plaza Massachusetts avg Federal benchmark
Total violations 241 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 56.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 200 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 Imperial Plaza water safe to drink? ▼
Imperial Plaza (PWS ID: MA2179022) has 241 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 200 people using Groundwater sources.
How many people does Imperial Plaza serve? ▼
Imperial Plaza serves 200 people in Mendon, Massachusetts. It is a Private-owned system using Groundwater water sources with 4 service connections.
What type of violations does Imperial Plaza have? ▼
Imperial Plaza has 241 total violations: 0 health-based violations (MCL exceedances or treatment failures), 235 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Imperial Plaza water? ▼
No PFAS testing data is available for Imperial Plaza under the EPA's UCMR5 monitoring program.
What water source does Imperial Plaza use? ▼
Imperial Plaza 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.