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County water report

Coahoma County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Coahoma County, Mississippi.

Water grade

F

Water score

6.6

State rank

#80

of 82

Health violations

135

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

9

12,363 recent measurements

Live streamflow

0%

BIG SUNFLOWER RIVER AT CLARKSDALE, MS

Water at a glance

Key Water Indicators for Coahoma County

EPA SDWIS

Safety Grade

F

Score: 6.6 / 100

EPA SDWIS

Active Violations

135

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

0% of mean

BIG SUNFLOWER RIVER AT CLARKSDALE, MS

EPA WQP

Monitoring Sites

9

12,363 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.

6.6/100

Health violations

135

Health-based violations

Violations per 100K served

569.7

Population-normalized SDWIS rate

Editorial analysis

Understanding Coahoma County’s Water

Drinking Water Quality Overview

EPA SDWIS

Coahoma County's water systems carry a failing grade, scoring 6.6 out of 100. Over the past five years, EPA SDWIS records 135 health-based violations — a pattern that public water utilities are required to disclose and correct.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-12T19:00:00.000-05:00) puts BIG SUNFLOWER RIVER at 0.0 cfs — well below its long-term average at 0% 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. Coahoma County has limited coverage with 9 active monitoring sites with 12,363 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 Coahoma County

Water Verdict

Coahoma County, Mississippi receives a poor water quality assessment with a grade of F and a score of 6.6 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. The county's primary USGS gauge drains roughly 108 square miles of upstream watershed, giving local source waters a regional footprint.

Violation Context

EPA SDWIS records for Coahoma County, Mississippi show 135 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 569.7 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: 12,363 water-quality results have been logged across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Coahoma County has a Grade F compliance record with 135 health-based violations — among the highest levels in the country. Coahoma County's drinking-water compliance score is 6.6 out of 100. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the Mississippi Department of Environmental Quality or Health can expedite utility compliance action. There are 9 active water-quality monitoring sites in Coahoma County. A pipeline streamflow snapshot from the BIG SUNFLOWER RIVER gauge is also available on this page.

Regional Context

Coahoma County has poorer water quality than the average county in Mississippi. Its water score is 45.1 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 Coahoma County's water environment

Official EPA Resources for Coahoma County

EPA How's My Waterway

Interactive watershed health data for Coahoma County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Coahoma County

Consumer Confidence Reports (MS)

Annual water quality reports from utilities in Mississippi

Past 5 years

Water Quality Monitoring

Monitoring Sites

9

Active in the past 5 years

Measurements Recorded

12K

12,363 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).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

0.02cfs

May 13, 12:00 AM UTC

vs Long-Term Average

0%

Well below typical

Primary Streamgage

BIG SUNFLOWER RIVER AT CLARKSDALE, MS

USGS site
07288000
Drainage area
108 sq mi
Long-term mean
89.3 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

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Coahoma 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 Coahoma County, Mississippi?
Coahoma County, Mississippi has a drinking-water quality grade of F with a score of 6.6/100, based on EPA SDWIS compliance data. The county has 135 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 Coahoma County?
Coahoma County has 135 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 Coahoma County?
EPA's Water Quality Portal records 12,363 measurements from 9 monitoring sites in Coahoma 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.
What's happening with rivers in Coahoma County right now?
Coahoma County's primary USGS streamgage on the BIG SUNFLOWER RIVER has a pipeline snapshot of 0.02 cubic feet per second — 0% of the long-term mean of 89.35 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 Coahoma County water compare to the Mississippi average?
Coahoma County's SDWIS water quality score of 6.6/100 is lower than the Mississippi state average of 51.7. The average water quality grade across Mississippi is D, based on data from 82 counties with available SDWIS data.
Is tap water safe to drink in Coahoma County?
Based on EPA SDWIS data, Coahoma County has a water quality grade of F (6.6/100). 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 Coahoma County have so many water violations?
Coahoma County has 135 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 Coahoma County rank for water quality in Mississippi?
Coahoma County ranks #80 out of 82 counties in Mississippi by SDWIS water quality score (1 = best). With a score of 6.6/100, 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

Sharkey County

Mississippi

F

2.9

Water score

Quitman County

Mississippi

F

11.0

Water score

Smith County

Mississippi

F

11.1

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.

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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