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Federal water data

County water report

Clarke County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Clarke County, Iowa.

Water grade

F

Water score

34.5

State rank

#88

of 99

Health violations

5

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

2

522 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Clarke County

EPA SDWIS

Safety Grade

F

Score: 34.5 / 100

EPA SDWIS

Active Violations

5

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

2

522 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

34.5/100

Health violations

5

Health-based violations

Violations per 100K served

48.7

Population-normalized SDWIS rate

Editorial analysis

Understanding Clarke County’s Water

Drinking Water Quality Overview

EPA SDWIS

Clarke County's water systems carry a failing grade, scoring 34.5 out of 100. Over the past five years, EPA SDWIS records 5 health-based violations — a pattern that public water utilities are required to disclose and correct.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Clarke County has limited coverage with 2 active monitoring sites with 522 recent measurements on record. Predominant monitoring categories include physical and nutrient. 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 Clarke County

Water Verdict

Clarke County, Iowa receives a poor water quality assessment with a grade of F and a score of 34.5 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans.

Violation Context

EPA SDWIS records for Clarke County, Iowa show 5 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 48.7 violations per 100,000 people served, this rate is high and signals significant water quality management issues. Independent monitoring is comparatively sparse here — 522 water-quality results logged in the EPA Water Quality Portal over the past five years — so the utility's own reporting carries extra weight.

Consumer Guidance

Drinking-water compliance in Clarke County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Clarke County's drinking-water compliance score is 34.5 out of 100. The violation rate for Clarke County is 48.7 per 100,000 people served. An NSF 53 or NSF 58-certified filter is recommended for drinking and cooking water. Check the Consumer Confidence Report from your utility to identify the specific contaminants and required corrective actions — utilities are legally required to notify customers of violations. There are 2 active water-quality monitoring sites in Clarke County.

Regional Context

Clarke County has poorer water quality than the average county in Iowa. Its water score is 37.2 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

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 Clarke County's water environment

Official EPA Resources for Clarke County

EPA How's My Waterway

Interactive watershed health data for Clarke County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Clarke County

Consumer Confidence Reports (IA)

Annual water quality reports from utilities in Iowa

Past 5 years

Water Quality Monitoring

Monitoring Sites

2

Active in the past 5 years

Measurements Recorded

522

522 total readings

Most Measured

  • Physical
  • Nutrient
  • Inorganics, Major, Non-metals

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).

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Annual Total

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Monthly

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Water Bill

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Filter Cost

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Safety Grade for Clarke County:F — Failing

High violation count or severe watershed conditions.

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 Clarke County, Iowa?
Clarke County, Iowa has a drinking-water quality grade of F with a score of 34.5/100, based on EPA SDWIS compliance data. The county has 5 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 Clarke County?
Clarke County has 5 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 Clarke County?
EPA's Water Quality Portal records 522 measurements from 2 monitoring sites in Clarke County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Inorganics, Major, Non-metals. 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 Clarke County water compare to the Iowa average?
Clarke County's SDWIS water quality score of 34.5/100 is lower than the Iowa state average of 71.7. The average water quality grade across Iowa is C, based on data from 99 counties with available SDWIS data.
Is tap water safe to drink in Clarke County?
Based on EPA SDWIS data, Clarke County has a water quality grade of F (34.5/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. 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 Clarke County have clean drinking water?
Clarke County has 5 health-based drinking water violations according to EPA records. With a water quality score of 34.5/100 and grade F, 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 Clarke County rank for water quality in Iowa?
Clarke County ranks #88 out of 99 counties in Iowa by SDWIS water quality score (1 = best). With a score of 34.5/100, it falls in the bottom 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

Webster County

Iowa

F

35.8

Water score

Benton County

Iowa

F

36.1

Water score

Hancock County

Iowa

F

36.4

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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