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Federal water data

County water report

Harrison County Water Report

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

Water grade

C

Water score

57.9

State rank

#34

of 82

Health violations

15

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

121

69,349 recent measurements

Live streamflow

212%

WOLF RIVER NR LANDON, MS

Water at a glance

Key Water Indicators for Harrison County

EPA SDWIS

Safety Grade

C

Score: 57.9 / 100

EPA SDWIS

Active Violations

15

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

212% of mean

WOLF RIVER NR LANDON, MS

EPA WQP

Monitoring Sites

121

69,349 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.

57.9/100

Health violations

15

Health-based violations

Violations per 100K served

8.1

Population-normalized SDWIS rate

Editorial analysis

Understanding Harrison County’s Water

Drinking Water Quality Overview

EPA SDWIS

Harrison County's drinking water earned a C grade, scoring 57.9 out of 100. Over the past five years, EPA SDWIS records 15 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 2026-05-14T13:15:00.000-05:00) puts WOLF RIVER at 1.3k cfs — running significantly above its long-term average at 212% of mean flow. 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. Harrison County has extensive coverage with 121 active monitoring sites with 69,349 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 Harrison County

Water Verdict

Harrison County receives a fair water quality assessment with a grade of C and a score of 57.9 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

Harrison County has recorded 15 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 8.1 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Tap water in Harrison County meets baseline standards but the compliance record shows room for improvement, with a Grade C rating. Harrison County's drinking-water compliance score is 57.9 out of 100. The violation rate for Harrison County is 8.1 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. With 121 active water-quality monitoring sites in Harrison County, data coverage is strong. A pipeline streamflow snapshot from the WOLF RIVER gauge is also available on this page.

Regional Context

Harrison County has better water quality than the average county in Mississippi. Its water score is 6.2 points higher than the state average, indicating stronger water system performance relative to 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 Harrison County's water environment

Official EPA Resources for Harrison County

EPA How's My Waterway

Interactive watershed health data for Harrison County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Harrison County

Consumer Confidence Reports (MS)

Annual water quality reports from utilities in Mississippi

Past 5 years

Water Quality Monitoring

Monitoring Sites

121

Active in the past 5 years

Measurements Recorded

69K

69,349 total readings

Most Measured

  • Physical
  • Nutrient
  • Microbiological

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

1,280cfs

May 14, 6:15 PM UTC

vs Long-Term Average

212%

Well above typical

Primary Streamgage

WOLF RIVER NR LANDON, MS

USGS site
02481510
Drainage area
308 sq mi
Long-term mean
605 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

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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 Harrison County:D — Poor

Elevated violations or significant watershed impairment.

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 Harrison County, Mississippi?
Harrison County, Mississippi has a drinking-water quality grade of C with a score of 57.9/100, based on EPA SDWIS compliance data. The county has 15 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 Harrison County?
Harrison County has 15 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 Harrison County?
EPA's Water Quality Portal records 69,349 measurements from 121 monitoring sites in Harrison County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Microbiological. 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 Harrison County right now?
Harrison County's primary USGS streamgage on the WOLF RIVER has a pipeline snapshot of 1,280 cubic feet per second — 212% of the long-term mean of 604.82 cfs. This is well above typical — often a signal of recent precipitation or storm runoff. For the latest gauge feed, visit waterdata.usgs.gov.
How does Harrison County water compare to the Mississippi average?
Harrison County's SDWIS water quality score of 57.9/100 is higher 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 Harrison County?
Based on EPA SDWIS data, Harrison County has a water quality grade of C (57.9/100). 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 Harrison County have so many water violations?
Harrison County has 15 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 Harrison County rank for water quality in Mississippi?
Harrison County ranks #34 out of 82 counties in Mississippi by SDWIS water quality score (1 = best). With a score of 57.9/100, 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

Kemper County

Mississippi

C

57.9

Water score

DeSoto County

Mississippi

C

58.1

Water score

Lawrence County

Mississippi

C

57.5

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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