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County water report

Cimarron County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Cimarron County, Oklahoma.

Water grade

F

Water score

32.4

State rank

#12

of 77

Health violations

1

EPA SDWIS, 5-year lookback

Watershed impaired

100.0%

1 water bodies assessed

Monitoring sites

1

247 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Cimarron County

EPA SDWIS

Safety Grade

F

Score: 32.4 / 100

EPA SDWIS

Active Violations

1

5-year health-based lookback

EPA ATTAINS

Watershed Health

100% impaired

1 bodies assessed

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

1

247 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.

32.4/100

Health violations

1

Health-based violations

Violations per 100K served

55.6

Population-normalized SDWIS rate

Editorial analysis

Understanding Cimarron County’s Water

Drinking Water Quality Overview

EPA SDWIS

Cimarron County's water systems carry a failing grade, scoring 32.4 out of 100. Over the past five years, EPA SDWIS records 1 health-based violation — a single incident worth monitoring.

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 large majority — 100.0% — of assessed waterways are impaired (1 of 1 water bodies) across Cimarron County's watersheds. The leading impairment causes are sulfate and ph. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Cimarron County has limited coverage with 1 active monitoring site with 247 recent measurements on record. Predominant monitoring categories include organics, other and inorganics, minor, metals. 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 Cimarron County

Water Verdict

Cimarron County, Oklahoma receives a poor water quality assessment with a grade of F and a score of 32.4 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. Separately, EPA ATTAINS assessments cover 1 water body in the county's watershed, with 100.0% listed as impaired under the Clean Water Act — a source-water measure that is tracked independently of tap-water compliance.

Violation Context

EPA SDWIS records for Cimarron County, Oklahoma show 1 health-based violation, meaning a water system experienced at least one exceedance of federal contaminant limits or treatment requirements. At 55.6 violations per 100,000 people served, this rate is high and signals significant water quality management issues. Independent monitoring is comparatively sparse here — 247 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

Drinking-water compliance in Cimarron County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Cimarron County's drinking-water compliance score is 32.4 out of 100. The violation rate for Cimarron County is 55.6 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. Sulfate is the leading impairment cause in Cimarron County's watershed. There is 1 active water-quality monitoring site in Cimarron County.

Regional Context

Cimarron County has better water quality than the average county in Oklahoma. Its water score is 16.6 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 Cimarron County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Sulfate

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

  • 2

    pH imbalance

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

  • 3

    High turbidity

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Cimarron County

EPA How's My Waterway

Interactive watershed health data for Cimarron County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Cimarron County

Consumer Confidence Reports (OK)

Annual water quality reports from utilities in Oklahoma

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

100.0%

1 of 1 assessed

High concern

Top Impairment Causes

  • 1

    SULFATE

  • 2

    PH

  • 3

    TURBIDITY

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

1

Active in the past 5 years

Measurements Recorded

247

247 total readings

Most Measured

  • Organics, Other
  • Inorganics, Minor, Metals
  • 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).

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 Cimarron County:F — Failing

High violation count or severe watershed conditions.

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 Cimarron County, Oklahoma?
Cimarron County, Oklahoma has a drinking-water quality grade of F with a score of 32.4/100, based on EPA SDWIS compliance data. The county has 1 health-based drinking water violation over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Cimarron County?
Cimarron County has 1 health-based drinking water violation 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 Cimarron County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 100.0% of Cimarron County's 1 assessed water bodies are classified as impaired (1 impaired). The top reported causes are SULFATE, PH, TURBIDITY. 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 Cimarron County?
EPA's Water Quality Portal records 247 measurements from 1 monitoring sites in Cimarron County over the past five years. The most frequently measured characteristic groups are Organics, Other, Inorganics, Minor, Metals, 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.
How does Cimarron County water compare to the Oklahoma average?
Cimarron County's SDWIS water quality score of 32.4/100 is higher than the Oklahoma state average of 15.8. The average water quality grade across Oklahoma is F, based on data from 77 counties with available SDWIS data.
Is tap water safe to drink in Cimarron County?
Based on EPA SDWIS data, Cimarron County has a water quality grade of F (32.4/100). 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 Cimarron County have clean drinking water?
Cimarron County has 1 health-based drinking water violation according to EPA records. With a water quality score of 32.4/100 and grade F, 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 Cimarron County rank for water quality in Oklahoma?
Cimarron County ranks #12 out of 77 counties in Oklahoma by SDWIS water quality score (1 = best). With a score of 32.4/100, it falls in the top 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

Harmon County

Oklahoma

F

32.5

Water score

Woods County

Oklahoma

F

33.0

Water score

Custer County

Oklahoma

F

31.6

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.

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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