waterbycounty
Federal water data

County water report

Marion County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Marion County, Arkansas.

Water grade

F

Water score

14.4

State rank

#58

of 75

Health violations

23

EPA SDWIS, 5-year lookback

Watershed impaired

7.1%

113 water bodies assessed

Monitoring sites

25

17,087 recent measurements

Live streamflow

30%

Buffalo River near Harriet, AR

Water at a glance

Key Water Indicators for Marion County

EPA SDWIS

Safety Grade

F

Score: 14.4 / 100

EPA SDWIS

Active Violations

23

5-year health-based lookback

EPA ATTAINS

Watershed Health

7% impaired

113 bodies assessed

USGS NWIS

Streamflow Snapshot

30% of mean

Buffalo River near Harriet, AR

EPA WQP

Monitoring Sites

25

17,087 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.

14.4/100

Health violations

23

Health-based violations

Violations per 100K served

208.7

Population-normalized SDWIS rate

Editorial analysis

Understanding Marion County’s Water

Drinking Water Quality Overview

EPA SDWIS

Marion County's water systems carry a failing grade, scoring 14.4 out of 100. Over the past five years, EPA SDWIS records 23 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 small share — 7.1% — of assessed waterways are impaired (8 of 113 water bodies) across Marion County's watersheds. The leading impairment causes are escherichia coli (e. coli) and turbidity - base flows. 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 2026-05-14T13:45:00.000-05:00) puts Buffalo River at 455.0 cfs — well below its long-term average at 30% 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. Marion County has moderate coverage with 25 active monitoring sites with 17,087 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 Marion County

Water Verdict

Marion County, Arkansas receives a poor water quality assessment with a grade of F and a score of 14.4 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. Separately, EPA ATTAINS assessments cover 113 water bodies in the county's watershed, with 7.1% 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 30.2% — worth watching in drier seasons.

Violation Context

EPA SDWIS records for Marion County, Arkansas show 23 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 208.7 violations per 100,000 people served, this rate is high and signals significant water quality management issues. This compliance record sits alongside an unusually deep monitoring archive: 17,087 water-quality results have been logged across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Drinking-water compliance in Marion County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Marion County's drinking-water compliance score is 14.4 out of 100. 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. E. coli is the leading impairment cause in Marion County's watershed. With 25 active water-quality monitoring sites in Marion County, data coverage is strong. A pipeline streamflow snapshot from the Buffalo River gauge is also available on this page.

Regional Context

Marion County has poorer water quality than the average county in Arkansas. Its water score is 33.2 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 Marion County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    E. coli (bacteria)

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

  • 2

    High turbidity

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

  • 3

    Elevated temperature

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Marion County

EPA How's My Waterway

Interactive watershed health data for Marion County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Marion County

Consumer Confidence Reports (AR)

Annual water quality reports from utilities in Arkansas

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

7.1%

8 of 113 assessed

Mostly healthy

Top Impairment Causes

  • 1

    ESCHERICHIA COLI (E. COLI)

  • 2

    TURBIDITY - BASE FLOWS

  • 3

    TEMPERATURE

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

25

Active in the past 5 years

Measurements Recorded

17K

17,087 total readings

Most Measured

  • Physical
  • Nutrient
  • Inorganics, Minor, 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).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

455cfs

May 14, 6:45 PM UTC

vs Long-Term Average

30%

Well below typical

Primary Streamgage

Buffalo River near Harriet, AR

USGS site
07056700
Drainage area
1,070 sq mi
Long-term mean
1,505 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.

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 Marion 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.

Try the full calculator →

Improve your water quality at home

Berkey filters remove 99.9%+ of contaminants from tap water.

Shop Berkey →

Sponsored

Test your tap water

Tap Score provides professional mail-in water testing.

Get Tested →

Frequently Asked Questions

What is the water quality in Marion County, Arkansas?
Marion County, Arkansas has a drinking-water quality grade of F with a score of 14.4/100, based on EPA SDWIS compliance data. The county has 23 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 Marion County?
Marion County has 23 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 Marion County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 7.1% of Marion County's 113 assessed water bodies are classified as impaired (8 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), TURBIDITY - BASE FLOWS, TEMPERATURE. 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 Marion County?
EPA's Water Quality Portal records 17,087 measurements from 25 monitoring sites in Marion County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Inorganics, Minor, 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.
What's happening with rivers in Marion County right now?
Marion County's primary USGS streamgage on the Buffalo River has a pipeline snapshot of 455 cubic feet per second — 30% of the long-term mean of 1,505.46 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 Marion County water compare to the Arkansas average?
Marion County's SDWIS water quality score of 14.4/100 is lower than the Arkansas state average of 47.6. The average water quality grade across Arkansas is D, based on data from 75 counties with available SDWIS data.
Is tap water safe to drink in Marion County?
Based on EPA SDWIS data, Marion County has a water quality grade of F (14.4/100). 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).
Why does Marion County have so many water violations?
Marion County has 23 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 Marion County rank for water quality in Arkansas?
Marion County ranks #58 out of 75 counties in Arkansas by SDWIS water quality score (1 = best). With a score of 14.4/100, 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

Arkansas County

Arkansas

F

14.1

Water score

Polk County

Arkansas

F

14.8

Water score

Carroll County

Arkansas

F

12.9

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

Explore more data for Marion County

Property TaxCost of LivingCrime RateIncomeHealthSchoolsDisaster RiskWeatherCounty Score