Public water system · MI2180763

Active

Colonial Plaza

At a glance

Colonial Plaza (PWSID MI2180763) is an active transient non-community water system in Oakland County, Michigan. It reports serving 600 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2005.

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

Population served

600

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDMI2180763

System typeTransient non-community water system

Activity statusActive

Population served600

Service connections2

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyMI state drinking water program

City served—

StateMichigan

ZIP—

CountyOakland County

How does Colonial Plaza compare with other water systems in Oakland County?

By EPA's size categories, Colonial Plaza is a small system (501 to 3,300 people). Oakland County has 734 active public water systems. Its population served is about 62% below the county average of 1,561 people per system, and accounts for less than 0.1% of the 1,145,905 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Colonial Plaza is about 4.2 times that figure.

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

A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Michigan has 7,865 active transient non-community water systems, 74% 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 Colonial Plaza?

EPA lists Colonial 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. 638 of the 734 active systems in Oakland County (87%) are also privately owned.

Does Colonial Plaza have drinking water violations?

EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2005. The violations listed here began between January 1997 and July 2005. By type: 9 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (10 of them). EPA lists 11 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2005-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2004-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2004-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2002-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-04-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2001-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1999-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1998-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1998-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1997-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1997-01-01	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.

Colonial Plaza: frequently asked questions

Who runs Colonial Plaza?

Colonial Plaza (PWSID MI2180763) is a transient non-community water system privately owned. It is regulated by the MI state drinking water program.

How many people does Colonial Plaza serve?

Colonial Plaza reports serving 600 people through 2 service connections in Oakland County, Michigan.

Where does Colonial 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 Colonial Plaza have any drinking water violations?

EPA's records list 11 violations for this system; 2 are health-based, and the most recent began in July 2005. 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 Colonial 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; 2 are health-based, and the most recent began in July 2005. For current results, consult EPA ECHO, or the MI state drinking water program.

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

The annual Consumer Confidence Report requirement applies to community water systems. Colonial Plaza is a 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 Oakland County

Water system	County	Population served	Type	Source
Troy	Oakland	85,854	Community	Purchased surface water
Rochester Hills	Oakland	74,000	Community	Purchased surface water
Waterford Township	Oakland	73,441	Community	Groundwater
Southfield	Oakland	71,739	Community	Purchased surface water
Pontiac	Oakland	63,776	Community	Purchased surface water
Royal Oak, City of	Oakland	57,236	Community	Purchased surface water

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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, “Colonial Plaza, PWSID MI2180763, Michigan”, https://aquacensus.com/water-systems/michigan/colonial-plaza-mi2180763 (data as of October 1, 2026).