Public water system · MI0006320
ActiveSt. Louis, City of
At a glance
City of St. Louis (PWSID MI0006320) is an active community water system in Gratiot County, Michigan. It reports serving 6,976 people through 1,340 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
6,976
Service connections
1,340
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does City of St. Louis compare with other water systems in Gratiot County?
By EPA's size categories, City of St. Louis is a medium system (3,301 to 10,000 people). Gratiot County has 73 active public water systems, and City of St. Louis is the 2nd-largest of them by population served. Its population served is about 14 times the county average of 491 people per system, and accounts for 19% of the 35,869 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 City of St. Louis is roughly in line with 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 City of St. Louis?
EPA lists City of St. Louis 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. 8 of the 73 active systems in Gratiot County (11%) are also owned by a local government.
Does City of St. Louis have drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2017. The violations listed here began between August 2001 and October 2017. By type: 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2017-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2001-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 3 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.
City of St. Louis: frequently asked questions
Who runs City of St. Louis?
City of St. Louis (PWSID MI0006320) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does City of St. Louis serve?
City of St. Louis reports serving 6,976 people through 1,340 service connections in Gratiot County, Michigan.
Where does City of St. Louis 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 City of St. Louis have any drinking water violations?
EPA's records list 3 violations for this system; 1 is health-based, and the most recent began in October 2017. 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 City of St. Louis' 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 3 violations for this system; 1 is health-based, and the most recent began in October 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find City of St. Louis' water quality report?
As a community water system, City of St. Louis 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 Gratiot County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Alma, City of | Gratiot | 9,182 | Community | Purchased surface water |
| Ithaca, City of | Gratiot | 3,098 | Community | Groundwater |
| Mdot - Ithaca, R632 | Gratiot | 1,463 | Transient non-community | Groundwater |
| Breckenridge, Village of | Gratiot | 1,339 | Community | Groundwater |
| Alma Ez Mart | Gratiot | 900 | Transient non-community | Groundwater |
| Ncg - Alma Cinemas | Gratiot | 750 | Transient non-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, “St. Louis, City of, PWSID MI0006320, Michigan”, https://aquacensus.com/water-systems/michigan/st-louis-city-of-mi0006320 (data as of October 1, 2026).