waterbycounty
EPA SDWIS

Coshocton County Water Quality

Coshocton County, Ohio

Water Grade

C

Water Score

59.4

Violations

1

State Rank

#48

of 88 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

C

Based on EPA compliance history and violation data

Water Score

59.4/100

Higher = better quality

Health Violations

1

Health-based violations

Violation Rate

6.8%

Systems with violations

Water Advisory: Coshocton County

Water Verdict

Coshocton County receives a fair water quality assessment with a grade of C and a score of 59.4 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

Coshocton County has recorded 1 health-based violation, meaning the water system experienced at least one exceedance of federal contaminant limits or treatment requirements. At 6.8 violations per 1,000 residents, this rate is moderate and suggests recurring water quality challenges.

Consumer Guidance

Tap water in Coshocton County meets baseline standards, but residents who are immunocompromised or have young children may want to use an NSF-certified water filter as a precaution. With 1 recorded health violation, staying informed about utility communications and boil-water notices is especially important. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.

Regional Context

Coshocton County has water quality close to the average county in Ohio. Its water score is within 3.2 points of the state average, meaning its overall water system performance is broadly representative of Ohio as a whole.

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 13 assessed

Mostly healthy

Top Impairment Causes

No specific impairment causes reported for this county's assessed water bodies.

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state — counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

22

Active in the past 5 years

Measurements Recorded

4.7K

4,734 total readings

Most Measured

  • Physical
  • Inorganics, Minor, Metals
  • Nutrient

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).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

5,800cfs

May 14, 7:00 PM UTC

vs Long-Term Average

110%

Near typical

Primary Streamgage

Muskingum River near Coshocton OH

USGS site
03140500
Drainage area
4,859 sq mi
Long-term mean
5,276 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges — this view summarizes the primary one. The long-term mean is the full-record annual average; "% of typical" compares the latest reading against that average.

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Frequently Asked Questions

What is the water quality in Coshocton County, Ohio?
Coshocton County, Ohio has a drinking-water quality grade of C with a score of 59.4/100, based on EPA SDWIS compliance data. The county has 1 health-based drinking water violation over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in Coshocton County?
Coshocton County has 1 health-based drinking water violation 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 healthy are the watersheds in Coshocton County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Coshocton County's 13 assessed water bodies are classified as impaired (0 impaired). Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in Coshocton County?
EPA's Water Quality Portal records 4,734 measurements from 22 monitoring sites in Coshocton County over the past five years. The most frequently measured characteristic groups are Physical, Inorganics, Minor, Metals, Nutrient. 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.
What's happening with rivers in Coshocton County right now?
Coshocton County's primary USGS streamgage on the Muskingum River is currently reading 5,800 cubic feet per second — 110% of the long-term mean of 5,276.48 cfs. Flow is within typical range for this gauge. For genuine real-time data, visit waterdata.usgs.gov.
How does Coshocton County water compare to the Ohio average?
Coshocton County's SDWIS water quality score of 59.4/100 is higher than the Ohio state average of 56.2. The average water quality grade across Ohio is D, based on data from 88 counties with available SDWIS data.
Is tap water safe to drink in Coshocton County?
Based on EPA SDWIS data, Coshocton County has a water quality grade of C (59.4/100). 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 Coshocton County have clean drinking water?
Coshocton County has 1 health-based drinking water violation according to EPA records. With a water quality score of 59.4/100 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 Coshocton County rank for water quality in Ohio?
Coshocton County ranks #48 out of 88 counties in Ohio by SDWIS water quality score (1 = best). With a score of 59.4/100, 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

Shelby County

Ohio

C

59.3

Water score

Auglaize County

Ohio

C

59.8

Water score

Adams County

Ohio

C

60.1

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.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments — state-reported, EPA-finalized.

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.

Live streamflow from the USGS National Water Information System (NWIS) — continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

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 Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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