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Federal water data

County water report

Lonoke County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Lonoke County, Arkansas.

Water grade

F

Water score

39.8

State rank

#37

of 75

Health violations

14

EPA SDWIS, 5-year lookback

Watershed impaired

27.0%

422 water bodies assessed

Monitoring sites

14

2,024 recent measurements

Live streamflow

66%

Bayou Meto near Lonoke, AR

Water at a glance

Key Water Indicators for Lonoke County

EPA SDWIS

Safety Grade

F

Score: 39.8 / 100

EPA SDWIS

Active Violations

14

5-year health-based lookback

EPA ATTAINS

Watershed Health

27% impaired

422 bodies assessed

USGS NWIS

Streamflow Snapshot

66% of mean

Bayou Meto near Lonoke, AR

EPA WQP

Monitoring Sites

14

2,024 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.

39.8/100

Health violations

14

Health-based violations

Violations per 100K served

32.5

Population-normalized SDWIS rate

Editorial analysis

Understanding Lonoke County’s Water

Drinking Water Quality Overview

EPA SDWIS

Lonoke County's water systems carry a failing grade, scoring 39.8 out of 100. Over the past five years, EPA SDWIS records 14 health-based violations — a pattern that public water utilities are required to disclose and correct.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A notable 27.0% of assessed waterways carry an impairment designation (114 of 422 water bodies) across Lonoke County's watersheds. The leading impairment causes are mercury in fish tissue and turbidity - base flows. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T13:45:00.000-05:00) puts Bayou Meto at 199.0 cfs — running somewhat below its historical average at 66% of mean. 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. Lonoke County has moderate coverage with 14 active monitoring sites with 2,024 recent measurements on record. Predominant monitoring categories include inorganics, minor, metals 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 Lonoke County

Water Verdict

Lonoke County receives a poor water quality assessment with a grade of F and a score of 39.8 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.

Violation Context

Lonoke County has recorded 14 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 32.5 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Drinking-water compliance in Lonoke County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Lonoke County's drinking-water compliance score is 39.8 out of 100. The violation rate for Lonoke County is 32.5 per 100,000 people served. An NSF 53 or NSF 58-certified filter is recommended for drinking and cooking water. Check the Consumer Confidence Report from your utility to identify the specific contaminants and required corrective actions — utilities are legally required to notify customers of violations. Mercury in Fish Tissue is the leading impairment cause in Lonoke County's watershed. With 14 active water-quality monitoring sites in Lonoke County, data coverage is strong. A pipeline streamflow snapshot from the Bayou Meto gauge is also available on this page.

Regional Context

Lonoke County has poorer water quality than the average county in Arkansas. Its water score is 7.8 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 Lonoke County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Mercury (fish tissue)

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 2

    High turbidity

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 3

    Dissolved Oxygen - Critical

    Impairment cause per EPA Clean Water Act §303(d) assessment

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Lonoke County

EPA How's My Waterway

Interactive watershed health data for Lonoke County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Lonoke County

Consumer Confidence Reports (AR)

Annual water quality reports from utilities in Arkansas

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

27.0%

114 of 422 assessed

Some impairment

Top Impairment Causes

  • 1

    MERCURY IN FISH TISSUE

  • 2

    TURBIDITY - BASE FLOWS

  • 3

    DISSOLVED OXYGEN - CRITICAL

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state; counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

14

Active in the past 5 years

Measurements Recorded

2.0K

2,024 total readings

Most Measured

  • Inorganics, Minor, Metals
  • Nutrient
  • Physical

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

199cfs

May 14, 6:45 PM UTC

vs Long-Term Average

66%

Below typical

Primary Streamgage

Bayou Meto near Lonoke, AR

USGS site
07264000
Drainage area
207 sq mi
Long-term mean
303 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 Lonoke County:C — Moderate

Some violations or watershed impairment detected.

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 Lonoke County, Arkansas?
Lonoke County, Arkansas has a drinking-water quality grade of F with a score of 39.8/100, based on EPA SDWIS compliance data. The county has 14 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 Lonoke County?
Lonoke County has 14 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 healthy are the watersheds in Lonoke County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 27.0% of Lonoke County's 422 assessed water bodies are classified as impaired (114 impaired). The top reported causes are MERCURY IN FISH TISSUE, TURBIDITY - BASE FLOWS, DISSOLVED OXYGEN - CRITICAL. Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in Lonoke County?
EPA's Water Quality Portal records 2,024 measurements from 14 monitoring sites in Lonoke County over the past five years. The most frequently measured characteristic groups are Inorganics, Minor, Metals, Nutrient, Physical. 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 Lonoke County right now?
Lonoke County's primary USGS streamgage on the Bayou Meto has a pipeline snapshot of 199 cubic feet per second — 66% of the long-term mean of 303.49 cfs. Flow is within typical range for this gauge. For the latest gauge feed, visit waterdata.usgs.gov.
How does Lonoke County water compare to the Arkansas average?
Lonoke County's SDWIS water quality score of 39.8/100 is lower than the Arkansas state average of 47.6. The average water quality grade across Arkansas is D, based on data from 75 counties with available SDWIS data.
Is tap water safe to drink in Lonoke County?
Based on EPA SDWIS data, Lonoke County has a water quality grade of F (39.8/100). 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 Lonoke County have so many water violations?
Lonoke County has 14 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 Lonoke County rank for water quality in Arkansas?
Lonoke County ranks #37 out of 75 counties in Arkansas by SDWIS water quality score (1 = best). With a score of 39.8/100, 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

Crittenden County

Arkansas

F

40.2

Water score

Benton County

Arkansas

F

40.3

Water score

Crawford County

Arkansas

F

38.8

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.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments, state-reported and EPA-finalized.

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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