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Federal water data

County water report

Allen County Water Report

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

Water grade

D

Water score

41.4

State rank

#44

of 105

Health violations

3

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

N/A

EPA Water Quality Portal

Live streamflow

36%

NEOSHO R NR IOLA, KS

Water at a glance

Key Water Indicators for Allen County

EPA SDWIS

Safety Grade

D

Score: 41.4 / 100

EPA SDWIS

Active Violations

3

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

36% of mean

NEOSHO R NR IOLA, KS

EPA WQP

Monitoring Sites

N/A

Rolling 5-year window

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.

41.4/100

Health violations

3

Health-based violations

Violations per 100K served

30.0

Population-normalized SDWIS rate

Editorial analysis

Understanding Allen County’s Water

Drinking Water Quality Overview

EPA SDWIS

Allen County's drinking water received a D grade, scoring 41.4 out of 100. Over the past five years, EPA SDWIS records 3 health-based violations — a small cluster that warrants attention.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T13:30:00.000-05:00) puts NEOSHO R at 685.0 cfs — well below its long-term average at 36% 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.

Editorial advisory

What the data suggests for Allen County

Water Verdict

Allen County receives a below-average water quality assessment with a grade of D and a score of 41.4 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Allen County has recorded 3 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 30.0 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Allen County's drinking-water compliance is below average with a Grade D, indicating repeated or unresolved violations in the recent record. Allen County's drinking-water compliance score is 41.4 out of 100. The violation rate for Allen County is 30.0 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. A pipeline streamflow snapshot from the NEOSHO R gauge is also available on this page.

Regional Context

Allen County has water quality close to the average county in Kansas. Its water score is within 1.2 points of the state average, meaning its overall water system performance is broadly representative of Kansas 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 Allen County's water environment

Official EPA Resources for Allen County

EPA How's My Waterway

Interactive watershed health data for Allen County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Allen County

Consumer Confidence Reports (KS)

Annual water quality reports from utilities in Kansas

Live USGS Streamgage

River & Stream Conditions

Current Discharge

685cfs

May 14, 6:30 PM UTC

vs Long-Term Average

36%

Well below typical

Primary Streamgage

NEOSHO R NR IOLA, KS

USGS site
07183000
Drainage area
3,723 sq mi
Long-term mean
1,894 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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3 people  ·  ~225 gal/day

Annual Total

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Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Allen 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 Allen County, Kansas?
Allen County, Kansas has a drinking-water quality grade of D with a score of 41.4/100, based on EPA SDWIS compliance data. The county has 3 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 Allen County?
Allen County has 3 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.
What's happening with rivers in Allen County right now?
Allen County's primary USGS streamgage on the NEOSHO R has a pipeline snapshot of 685 cubic feet per second — 36% of the long-term mean of 1,893.96 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 Allen County water compare to the Kansas average?
Allen County's SDWIS water quality score of 41.4/100 is lower 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 Allen County?
Based on EPA SDWIS data, Allen County has a water quality grade of D (41.4/100). 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).
Does Allen County have clean drinking water?
Allen County has 3 health-based drinking water violations according to EPA records. With a water quality score of 41.4/100 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 Allen County rank for water quality in Kansas?
Allen County ranks #44 out of 105 counties in Kansas by SDWIS water quality score (1 = best). With a score of 41.4/100, 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

Geary County

Kansas

D

41.7

Water score

Ellis County

Kansas

F

40.9

Water score

Shawnee County

Kansas

D

42.1

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.

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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