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Federal water data

County water report

Vernon County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Vernon County, Missouri.

Water grade

D

Water score

48.3

State rank

#49

of 115

Health violations

4

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

13

1,270 recent measurements

Live streamflow

5%

Marmaton River near Nevada, MO

Water at a glance

Key Water Indicators for Vernon County

EPA SDWIS

Safety Grade

D

Score: 48.3 / 100

EPA SDWIS

Active Violations

4

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

5% of mean

Marmaton River near Nevada, MO

EPA WQP

Monitoring Sites

13

1,270 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

D

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

48.3/100

Health violations

4

Health-based violations

Violations per 100K served

18.6

Population-normalized SDWIS rate

Editorial analysis

Understanding Vernon County’s Water

Drinking Water Quality Overview

EPA SDWIS

Vernon County's drinking water received a D grade, scoring 48.3 out of 100. Over the past five years, EPA SDWIS records 4 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 2026-05-14T13:45:00.000-05:00) puts Marmaton River at 45.8 cfs — well below its long-term average at 5% 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. Vernon County has moderate coverage with 13 active monitoring sites with 1,270 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 Vernon County

Water Verdict

Vernon County receives a below-average water quality assessment with a grade of D and a score of 48.3 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Vernon County has recorded 4 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 18.6 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Vernon County's drinking-water compliance is below average with a Grade D, indicating repeated or unresolved violations in the recent record. Vernon County's drinking-water compliance score is 48.3 out of 100. The violation rate for Vernon County is 18.6 per 100,000 people served. Residents are encouraged to use an NSF 53 or NSF 58-certified filter for drinking and cooking water until the underlying violations are resolved. Running tap water for 30 seconds before use and avoiding older lead-pipe connections can also reduce exposure risk. The current Consumer Confidence Report from your utility will specify the contaminants of concern. With 13 active water-quality monitoring sites in Vernon County, data coverage is strong. A pipeline streamflow snapshot from the Marmaton River gauge is also available on this page.

Regional Context

Vernon County has water quality close to the average county in Missouri. Its water score is within 0.5 points of the state average, meaning its overall water system performance is broadly representative of Missouri 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 Vernon County's water environment

Official EPA Resources for Vernon County

EPA How's My Waterway

Interactive watershed health data for Vernon County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Vernon County

Consumer Confidence Reports (MO)

Annual water quality reports from utilities in Missouri

Past 5 years

Water Quality Monitoring

Monitoring Sites

13

Active in the past 5 years

Measurements Recorded

1.3K

1,270 total readings

Most Measured

  • Physical
  • Nutrient
  • Inorganics, Major, 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

45.8cfs

May 14, 6:45 PM UTC

vs Long-Term Average

5%

Well below typical

Primary Streamgage

Marmaton River near Nevada, MO

USGS site
06918060
Drainage area
1,074 sq mi
Long-term mean
987 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 Vernon 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 Vernon County, Missouri?
Vernon County, Missouri has a drinking-water quality grade of D with a score of 48.3/100, based on EPA SDWIS compliance data. The county has 4 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 Vernon County?
Vernon County has 4 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 Vernon County?
EPA's Water Quality Portal records 1,270 measurements from 13 monitoring sites in Vernon County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Inorganics, Major, 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 Vernon County right now?
Vernon County's primary USGS streamgage on the Marmaton River has a pipeline snapshot of 45.8 cubic feet per second — 5% of the long-term mean of 987.45 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 Vernon County water compare to the Missouri average?
Vernon County's SDWIS water quality score of 48.3/100 is lower than the Missouri state average of 48.8. The average water quality grade across Missouri is D, based on data from 115 counties with available SDWIS data.
Is tap water safe to drink in Vernon County?
Based on EPA SDWIS data, Vernon County has a water quality grade of D (48.3/100). 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 Vernon County have clean drinking water?
Vernon County has 4 health-based drinking water violations according to EPA records. With a water quality score of 48.3/100 and grade D, 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 Vernon County rank for water quality in Missouri?
Vernon County ranks #49 out of 115 counties in Missouri by SDWIS water quality score (1 = best). With a score of 48.3/100, 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

Butler County

Missouri

D

49.5

Water score

Phelps County

Missouri

D

49.5

Water score

Newton County

Missouri

D

47.0

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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