Public water system · MI2013930

Active

Somerset Plaza

At a glance

Somerset Plaza (PWSID MI2013930) is an active non-transient non-community water system in Hillsdale County, Michigan. It reports serving 110 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 11 violations for this system; none is health-based, and the most recent began in January 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

110

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDMI2013930

System typeNon-transient non-community water system

Activity statusActive

Population served110

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyMI state drinking water program

City served—

StateMichigan

ZIP—

CountyHillsdale County

How does Somerset Plaza compare with other water systems in Hillsdale County?

By EPA's size categories, Somerset Plaza is a very small system (500 people or fewer). Hillsdale County has 90 active public water systems. Its population served is about 66% below the county average of 325 people per system, and accounts for 0.4% of the 29,262 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Somerset Plaza is well below that figure.

What does “non-transient non-community water system” mean?

A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Michigan has 1,402 active non-transient non-community water systems, 13% of the state's 10,599 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,214 Michigan systems (96%) list groundwater as their primary source.

Who owns and regulates Somerset Plaza?

EPA lists Somerset Plaza as privately owned. The MI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 84 of the 90 active systems in Hillsdale County (93%) are also privately owned.

Does Somerset Plaza have drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in January 2025. The violations listed here began between January 1998 and January 2025. By type: 7 monitoring and reporting and 4 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 10 as resolved and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2025-01-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Archived
2017-05-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2016-10-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2016-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2016-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2004-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2000-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-04-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1998-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 11 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Somerset Plaza: frequently asked questions

Who runs Somerset Plaza?

Somerset Plaza (PWSID MI2013930) is a non-transient non-community water system privately owned. It is regulated by the MI state drinking water program.

How many people does Somerset Plaza serve?

Somerset Plaza reports serving 110 people through 1 service connection in Hillsdale County, Michigan.

Where does Somerset Plaza get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Somerset Plaza have any drinking water violations?

EPA's records list 11 violations for this system; none is health-based, and the most recent began in January 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Somerset Plaza's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 11 violations for this system; none is health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the MI state drinking water program.

Where can I find Somerset Plaza's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Somerset Plaza is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.

Other water systems in Hillsdale County

Water system	County	Population served	Type	Source
Hillsdale	Hillsdale	8,163	Community	Groundwater
Jonesville	Hillsdale	2,258	Community	Groundwater
Litchfield	Hillsdale	1,310	Community	Groundwater
Reading	Hillsdale	1,078	Community	Groundwater
Hillsdale American Legion #53	Hillsdale	780	Transient non-community	Groundwater
Michindoh Conference Center	Hillsdale	779	Community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Somerset Plaza, PWSID MI2013930, Michigan”, https://aquacensus.com/water-systems/michigan/somerset-plaza-mi2013930 (data as of October 1, 2026).