PlainWater

Calhoun County, Michigan

Water Systems
148
Population Served
94,845
Total Violations
3,433
279 health-based
PFAS Detected
2
of 5 tested

Violation Analysis

87.8%
Systems with Violations
23.2
Avg Violations per System
8.1%
Health-Based Violations

Water Source Types

GW
50 systems (34%)

PFAS Contamination

5
Systems Tested
2
PFAS Detected
40.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Calhoun Michigan water systems by violation status, EPA SDWIS records.

No violations on record (5) One or more violations (45)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

Other Counties in Michigan

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Calhoun County?
Calhoun County has 3,433 total drinking water violations across 148 water systems, of which 279 are health-based violations. 87.8% of systems have at least one violation.
How many people get water from Calhoun County systems?
Water systems in Calhoun County serve approximately 94,845 people through 148 public water systems.
Has PFAS been detected in Calhoun County water?
Of 5 water systems tested for PFAS in Calhoun County, 2 had PFAS detected (40.0% detection rate).
What types of water sources supply Calhoun County?
Water systems in Calhoun County use GW (50 systems) as their primary water sources.
Are health-based violations serious?
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 8.1% of Calhoun County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.