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County water report

Clark County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Clark County, Indiana.

Water grade

C

Water score

53.5

State rank

#46

of 92

Health violations

21

EPA SDWIS, 5-year lookback

Watershed impaired

23.3%

210 water bodies assessed

Monitoring sites

28

2,205 recent measurements

Live streamflow

22%

SILVER CREEK NEAR SELLERSBURG, IN

Water at a glance

Key Water Indicators for Clark County

EPA SDWIS

Safety Grade

C

Score: 53.5 / 100

EPA SDWIS

Active Violations

21

5-year health-based lookback

EPA ATTAINS

Watershed Health

23% impaired

210 bodies assessed

USGS NWIS

Streamflow Snapshot

22% of mean

SILVER CREEK NEAR SELLERSBURG, IN

EPA WQP

Monitoring Sites

28

2,205 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.

53.5/100

Health violations

21

Health-based violations

Violations per 100K served

11.9

Population-normalized SDWIS rate

Editorial analysis

Understanding Clark County’s Water

Drinking Water Quality Overview

EPA SDWIS

Clark County's drinking water earned a C grade, scoring 53.5 out of 100. Over the past five years, EPA SDWIS records 21 health-based violations — a pattern that public water utilities are required to disclose and correct.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A notable 23.3% of assessed waterways carry an impairment designation (49 of 210 water bodies) across Clark County's watersheds. The leading impairment causes are escherichia coli (e. coli) and biological integrity. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T14:30:00.000-04:00) puts SILVER CREEK at 52.4 cfs — well below its long-term average at 22% of mean — low-flow conditions worth noting for water-dependent ecosystems. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Clark County has moderate coverage with 28 active monitoring sites with 2,205 recent measurements on record. Predominant monitoring categories include physical and biological, counts. 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 Clark County

Water Verdict

Clark County, Indiana receives a below-average water quality assessment with a grade of C and a score of 53.5 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking. Separately, EPA ATTAINS assessments cover 210 water bodies in the county's watershed, with 23.3% listed as impaired under the Clean Water Act — a source-water measure that is tracked independently of tap-water compliance. At the most recent USGS reading, local streamflow was below its historical mean at 21.5% — worth watching in drier seasons.

Violation Context

EPA SDWIS records for Clark County, Indiana show 21 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 11.9 violations per 100,000 people served, this rate is high and signals significant water quality management issues. For independent context, 2,205 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Tap water in Clark County meets baseline standards but the compliance record shows room for improvement, with a Grade C rating. Clark County's drinking-water compliance score is 53.5 out of 100. The violation rate for Clark County is 11.9 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. E. coli is the leading impairment cause in Clark County's watershed. With 28 active water-quality monitoring sites in Clark County, data coverage is strong. A pipeline streamflow snapshot from the SILVER CREEK gauge is also available on this page.

Regional Context

Clark County has water quality close to the average county in Indiana. Its water score is within 1 points of the state average, meaning its overall water system performance is broadly representative of Indiana 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 Clark County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    E. coli (bacteria)

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 2

    Biological Integrity

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 3

    Low dissolved oxygen

    Impairment cause per EPA Clean Water Act §303(d) assessment

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Clark County

EPA How's My Waterway

Interactive watershed health data for Clark County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Clark County

Consumer Confidence Reports (IN)

Annual water quality reports from utilities in Indiana

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

23.3%

49 of 210 assessed

Some impairment

Top Impairment Causes

  • 1

    ESCHERICHIA COLI (E. COLI)

  • 2

    BIOLOGICAL INTEGRITY

  • 3

    DISSOLVED OXYGEN

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

28

Active in the past 5 years

Measurements Recorded

2.2K

2,205 total readings

Most Measured

  • Physical
  • Biological, Counts
  • 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).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

52.4cfs

May 14, 6:30 PM UTC

vs Long-Term Average

22%

Well below typical

Primary Streamgage

SILVER CREEK NEAR SELLERSBURG, IN

USGS site
03294000
Drainage area
189 sq mi
Long-term mean
244 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; the percent-of-typical value compares the latest reading against that average.

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Water Cost Estimate

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Annual Total

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Monthly

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Water Bill

$558/yr

Filter Cost

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Safety Grade for Clark County:C — Moderate

Some violations or watershed impairment detected.

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 Clark County, Indiana?
Clark County, Indiana has a drinking-water quality grade of C with a score of 53.5/100, based on EPA SDWIS compliance data. The county has 21 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 Clark County?
Clark County has 21 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 healthy are the watersheds in Clark County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 23.3% of Clark County's 210 assessed water bodies are classified as impaired (49 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), BIOLOGICAL INTEGRITY, DISSOLVED OXYGEN. 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 Clark County?
EPA's Water Quality Portal records 2,205 measurements from 28 monitoring sites in Clark County over the past five years. The most frequently measured characteristic groups are Physical, Biological, Counts, 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.
What's happening with rivers in Clark County right now?
Clark County's primary USGS streamgage on the SILVER CREEK has a pipeline snapshot of 52.4 cubic feet per second — 22% of the long-term mean of 243.92 cfs. This is well below typical — often a signal of drought stress on source water. For the latest gauge feed, visit waterdata.usgs.gov.
How does Clark County water compare to the Indiana average?
Clark County's SDWIS water quality score of 53.5/100 is higher than the Indiana state average of 52.5. The average water quality grade across Indiana is D, based on data from 92 counties with available SDWIS data.
Is tap water safe to drink in Clark County?
Based on EPA SDWIS data, Clark County has a water quality grade of C (53.5/100). 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).
Why does Clark County have so many water violations?
Clark County has 21 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Clark County rank for water quality in Indiana?
Clark County ranks #46 out of 92 counties in Indiana by SDWIS water quality score (1 = best). With a score of 53.5/100, 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

Hamilton County

Indiana

C

53.6

Water score

Fulton County

Indiana

C

53.2

Water score

Perry County

Indiana

C

53.9

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

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