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Federal water data

County water report

Sanilac County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Sanilac County, Michigan.

Water grade

C

Water score

55.4

State rank

#49

of 83

Health violations

2

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

47

5,841 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Sanilac County

EPA SDWIS

Safety Grade

C

Score: 55.4 / 100

EPA SDWIS

Active Violations

2

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

47

5,841 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

C

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

55.4/100

Health violations

2

Health-based violations

Violations per 100K served

10.1

Population-normalized SDWIS rate

Editorial analysis

Understanding Sanilac County’s Water

Drinking Water Quality Overview

EPA SDWIS

Sanilac County's drinking water earned a C grade, scoring 55.4 out of 100. Over the past five years, EPA SDWIS records 2 health-based violations — a small cluster that warrants attention.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Sanilac County has moderate coverage with 47 active monitoring sites with 5,841 recent measurements on record. Predominant monitoring categories include physical and microbiological. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for Sanilac County

Water Verdict

Sanilac County receives a fair water quality assessment with a grade of C and a score of 55.4 out of 100. The water supply meets baseline federal standards, but there may be periods of elevated contaminant levels or infrastructure concerns worth monitoring.

Violation Context

Sanilac County has recorded 2 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 10.1 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Tap water in Sanilac County meets baseline standards but the compliance record shows room for improvement, with a Grade C rating. Sanilac County's drinking-water compliance score is 55.4 out of 100. The violation rate for Sanilac County is 10.1 per 100,000 people served. Residents who are immunocompromised, pregnant, or have young children may benefit from using an NSF 53-certified filter. Contacting your local utility for the current Consumer Confidence Report will confirm which specific violations were recorded and whether they have been resolved. With 47 active water-quality monitoring sites in Sanilac County, data coverage is strong.

Regional Context

Sanilac County has water quality close to the average county in Michigan. Its water score is within 3.1 points of the state average, meaning its overall water system performance is broadly representative of Michigan as a whole.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in Sanilac County's water environment

Official EPA Resources for Sanilac County

EPA How's My Waterway

Interactive watershed health data for Sanilac County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Sanilac County

Consumer Confidence Reports (MI)

Annual water quality reports from utilities in Michigan

Past 5 years

Water Quality Monitoring

Monitoring Sites

47

Active in the past 5 years

Measurements Recorded

5.8K

5,841 total readings

Most Measured

  • Physical
  • Microbiological
  • Organics, Other

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Free tool

Estimate Your Water Costs

Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Sanilac County:D — Poor

Elevated violations or significant watershed impairment.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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Frequently Asked Questions

What is the water quality in Sanilac County, Michigan?
Sanilac County, Michigan has a drinking-water quality grade of C with a score of 55.4/100, based on EPA SDWIS compliance data. The county has 2 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Sanilac County?
Sanilac County has 2 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How much water-quality monitoring happens in Sanilac County?
EPA's Water Quality Portal records 5,841 measurements from 47 monitoring sites in Sanilac County over the past five years. The most frequently measured characteristic groups are Physical, Microbiological, Organics, Other. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
How does Sanilac County water compare to the Michigan average?
Sanilac County's SDWIS water quality score of 55.4/100 is lower than the Michigan state average of 58.5. The average water quality grade across Michigan is D, based on data from 83 counties with available SDWIS data.
Is tap water safe to drink in Sanilac County?
Based on EPA SDWIS data, Sanilac County has a water quality grade of C (55.4/100). This indicates moderate compliance. Some violations have been recorded but overall standards are maintained. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Does Sanilac County have clean drinking water?
Sanilac County has 2 health-based drinking water violations according to EPA records. With a water quality score of 55.4/100 and grade C, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How does Sanilac County rank for water quality in Michigan?
Sanilac County ranks #49 out of 83 counties in Michigan by SDWIS water quality score (1 = best). With a score of 55.4/100, it falls in the middle third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Montcalm County

Michigan

C

54.8

Water score

Eaton County

Michigan

C

56.3

Water score

St. Joseph County

Michigan

C

56.3

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP), federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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