Public water system · MI0005440

Active

Pontiac

At a glance

Pontiac (PWSID MI0005440) is an active community water system in Oakland County, Michigan. It reports serving 63,776 people through 19,391 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2009.

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

Population served

63,776

Service connections

19,391

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDMI0005440

System typeCommunity water system

Activity statusActive

Population served63,776

Service connections19,391

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyMI state drinking water program

City servedPontiac

StateMichigan

ZIP—

CountyOakland County

How does Pontiac compare with other water systems in Oakland County?

By EPA's size categories, Pontiac is a large system (10,001 to 100,000 people). Oakland County has 734 active public water systems, and Pontiac is the 5th-largest of them by population served. Its population served is about 41 times the county average of 1,561 people per system, and accounts for 5.6% 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 community water system reports serving 6,703 people, so Pontiac is about 9.5 times that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Michigan has 1,332 active community water systems, 13% of the state's 10,599 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 262 Michigan systems (2.5%) list purchased surface water as their primary source.

Who owns and regulates Pontiac?

EPA lists Pontiac as owned by a local government. 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. 56 of the 734 active systems in Oakland County (7.6%) are also owned by a local government.

Does Pontiac have drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2009. The violations listed here began between August 1993 and January 2009. By type: 7 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (5 of them). EPA lists 8 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
2009-01-02	Monitoring and reportingFailure Submit IDSE/Subpart V Plan Rpt · code 35	Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600	No	Resolved
2008-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2008-01-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
2007-10-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Haloacetic acids (HAA5)code 2456	No	Resolved
2007-10-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Total trihalomethanes (TTHM)code 2950	No	Resolved
2005-01-01	Monitoring and reportingMonitoring, Regular · code 03	Arseniccode 1005	No	Resolved
2003-08-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Resolved
2003-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1993-08-01	Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26	Total coliform bacteria (TCR)code 3100	No	Archived

All 9 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.

Pontiac: frequently asked questions

Who runs Pontiac?

Pontiac (PWSID MI0005440) is a community water system owned by a local government. It is regulated by the MI state drinking water program.

How many people does Pontiac serve?

Pontiac reports serving 63,776 people through 19,391 service connections in Oakland County, Michigan.

Where does Pontiac get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does Pontiac have any drinking water violations?

EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in January 2009. 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 Pontiac'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 9 violations for this system; 2 are health-based, and the most recent began in January 2009. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.

Where can I find Pontiac's water quality report?

As a community water system, Pontiac must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

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
Royal Oak, City of	Oakland	57,236	Community	Purchased surface water
Farmington Hills, City of	Oakland	56,984	Community	Purchased surface water

Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.

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, “Pontiac, PWSID MI0005440, Michigan”, https://aquacensus.com/water-systems/michigan/pontiac-mi0005440 (data as of October 1, 2026).