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Federal water data

County water report

Lyon County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Lyon County, Kansas.

Water grade

C

Water score

52.5

State rank

#39

of 105

Health violations

4

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

3

784 recent measurements

Live streamflow

No gauge

NEOSHO R AT NEOSHO RAPIDS, KS

Water at a glance

Key Water Indicators for Lyon County

EPA SDWIS

Safety Grade

C

Score: 52.5 / 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

No gauge

NEOSHO R AT NEOSHO RAPIDS, KS

EPA WQP

Monitoring Sites

3

784 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.

52.5/100

Health violations

4

Health-based violations

Violations per 100K served

13.0

Population-normalized SDWIS rate

Editorial analysis

Understanding Lyon County’s Water

Drinking Water Quality Overview

EPA SDWIS

Lyon County's drinking water earned a C grade, scoring 52.5 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.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Lyon County has limited coverage with 3 active monitoring sites with 784 recent measurements on record. Predominant monitoring categories include physical and sediment. 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 Lyon County

Water Verdict

Lyon County, Kansas receives a below-average water quality assessment with a grade of C and a score of 52.5 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking. The county's primary USGS gauge drains roughly 2,753 square miles of upstream watershed, giving local source waters a regional footprint.

Violation Context

EPA SDWIS records for Lyon County, Kansas show 4 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 13.0 violations per 100,000 people served, this rate is high and signals significant water quality management issues. Independent monitoring is comparatively sparse here — 784 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

Tap water in Lyon County meets baseline standards but the compliance record shows room for improvement, with a Grade C rating. Lyon County's drinking-water compliance score is 52.5 out of 100. The violation rate for Lyon County is 13.0 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. There are 3 active water-quality monitoring sites in Lyon County. A pipeline streamflow snapshot from the NEOSHO R gauge is also available on this page.

Regional Context

Lyon County has better water quality than the average county in Kansas. Its water score is 9.9 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 Lyon County's water environment

Official EPA Resources for Lyon County

EPA How's My Waterway

Interactive watershed health data for Lyon County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Lyon County

Consumer Confidence Reports (KS)

Annual water quality reports from utilities in Kansas

Past 5 years

Water Quality Monitoring

Monitoring Sites

3

Active in the past 5 years

Measurements Recorded

784

784 total readings

Most Measured

  • Physical
  • Sediment
  • Nutrient

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).

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 Lyon 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 Lyon County, Kansas?
Lyon County, Kansas has a drinking-water quality grade of C with a score of 52.5/100, 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 Lyon County?
Lyon 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 Lyon County?
EPA's Water Quality Portal records 784 measurements from 3 monitoring sites in Lyon County over the past five years. The most frequently measured characteristic groups are Physical, Sediment, Nutrient. 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 Lyon County water compare to the Kansas average?
Lyon County's SDWIS water quality score of 52.5/100 is higher than the Kansas state average of 42.6. The average water quality grade across Kansas is D, based on data from 105 counties with available SDWIS data.
Is tap water safe to drink in Lyon County?
Based on EPA SDWIS data, Lyon County has a water quality grade of C (52.5/100). 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).
Does Lyon County have clean drinking water?
Lyon County has 4 health-based drinking water violations according to EPA records. With a water quality score of 52.5/100 and grade C, 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 Lyon County rank for water quality in Kansas?
Lyon County ranks #39 out of 105 counties in Kansas by SDWIS water quality score (1 = best). With a score of 52.5/100, 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

Finney County

Kansas

C

52.1

Water score

Nemaha County

Kansas

D

46.9

Water score

Neosho County

Kansas

C

60.8

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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