Public water system · MI0003968

Active

Lyon Township

At a glance

Lyon Township (PWSID MI0003968) is an active community water system in Oakland County, Michigan. It reports serving 9,390 people through 1,403 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in October 2025.

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

Population served

9,390

Service connections

1,403

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMI0003968

System typeCommunity water system

Activity statusActive

Population served9,390

Service connections1,403

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMI state drinking water program

City served—

StateMichigan

ZIP—

CountyOakland County

How does Lyon Township compare with other water systems in Oakland County?

By EPA's size categories, Lyon Township is a medium system (3,301 to 10,000 people). Oakland County has 734 active public water systems. Its population served is about 6 times the county average of 1,561 people per system, and accounts for 0.8% 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 Lyon Township is about 40% above 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. 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 Lyon Township?

EPA lists Lyon Township 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 Lyon Township have drinking water violations?

EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in October 2025. The violations listed here began between August 2004 and October 2025. By type: 4 monitoring and reporting, 1 reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminants or rules involved are Lead and Copper Rule, Lead and Copper Rule Revisions, Nitrate and Groundwater Rule. EPA lists 5 as resolved, 1 as unaddressed 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement. 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
2025-10-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2025-07-02	ReportingNotification, Known or Potential LSL · code 4H	Lead and Copper Rule Revisionscode 5200	No	Unaddressed
2025-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Archived
2020-11-09	Public notice, recordkeeping or otherFailure to Consult with State · code 20	Groundwater Rulecode 0700	No	Resolved
2020-09-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2020-09-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2004-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved

All 7 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.

Lyon Township: frequently asked questions

Who runs Lyon Township?

Lyon Township (PWSID MI0003968) is a community water system owned by a local government. It is regulated by the MI state drinking water program.

How many people does Lyon Township serve?

Lyon Township reports serving 9,390 people through 1,403 service connections in Oakland County, Michigan.

Where does Lyon Township 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 Lyon Township have any drinking water violations?

EPA's records list 7 violations for this system; 1 is health-based, and the most recent began in October 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 Lyon Township'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 7 violations for this system; 1 is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.

Where can I find Lyon Township's water quality report?

As a community water system, Lyon Township 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
Pontiac	Oakland	63,776	Community	Purchased surface water
Royal Oak, City of	Oakland	57,236	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, “Lyon Township, PWSID MI0003968, Michigan”, https://aquacensus.com/water-systems/michigan/lyon-township-mi0003968 (data as of October 1, 2026).