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Federal water data

County water report

Sheridan County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Sheridan County, North Dakota.

Water grade

F

Water score

4.7

State rank

#52

of 52

Health violations

4

EPA SDWIS, 5-year lookback

Watershed impaired

18.8%

16 water bodies assessed

Monitoring sites

2

249 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Sheridan County

EPA SDWIS

Safety Grade

F

Score: 4.7 / 100

EPA SDWIS

Active Violations

4

5-year health-based lookback

EPA ATTAINS

Watershed Health

19% impaired

16 bodies assessed

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

2

249 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.

4.7/100

Health violations

4

Health-based violations

Violations per 100K served

836.8

Population-normalized SDWIS rate

Editorial analysis

Understanding Sheridan County’s Water

Drinking Water Quality Overview

EPA SDWIS

Sheridan County's water systems carry a failing grade, scoring 4.7 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.

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 18.8% of assessed waterways carry an impairment designation (3 of 16 water bodies) across Sheridan County's watersheds. The leading impairment causes are escherichia coli (e. coli) and dissolved oxygen. 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. Sheridan County has limited coverage with 2 active monitoring sites with 249 recent measurements on record. Predominant monitoring categories include nutrient and physical. 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 Sheridan County

Water Verdict

Sheridan County, North Dakota receives a poor water quality assessment with a grade of F and a score of 4.7 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 16 water bodies in the county's watershed, with 18.8% 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 Sheridan County, North Dakota show 4 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 836.8 violations per 100,000 people served, this rate is high and signals significant water quality management issues. Independent monitoring is comparatively sparse here — 249 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 Sheridan County is rated Grade F, reflecting significant health-based violations in the recent reporting period. Sheridan County's drinking-water compliance score is 4.7 out of 100. 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. E. coli is the leading impairment cause in Sheridan County's watershed. There are 2 active water-quality monitoring sites in Sheridan County.

Regional Context

Sheridan County has poorer water quality than the average county in North Dakota. Its water score is 66.9 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 Sheridan County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    E. coli (bacteria)

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

  • 2

    Low dissolved oxygen

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Sheridan County

EPA How's My Waterway

Interactive watershed health data for Sheridan County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Sheridan County

Consumer Confidence Reports (ND)

Annual water quality reports from utilities in North Dakota

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

18.8%

3 of 16 assessed

Some impairment

Top Impairment Causes

  • 1

    ESCHERICHIA COLI (E. COLI)

  • 2

    DISSOLVED OXYGEN

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

2

Active in the past 5 years

Measurements Recorded

249

249 total readings

Most Measured

  • Nutrient
  • Physical
  • Microbiological

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 Sheridan 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 Sheridan County, North Dakota?
Sheridan County, North Dakota has a drinking-water quality grade of F with a score of 4.7/100, 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 Sheridan County?
Sheridan 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 healthy are the watersheds in Sheridan County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 18.8% of Sheridan County's 16 assessed water bodies are classified as impaired (3 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), DISSOLVED OXYGEN. 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 Sheridan County?
EPA's Water Quality Portal records 249 measurements from 2 monitoring sites in Sheridan County over the past five years. The most frequently measured characteristic groups are Nutrient, Physical, Microbiological. 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 Sheridan County water compare to the North Dakota average?
Sheridan County's SDWIS water quality score of 4.7/100 is lower than the North Dakota state average of 71.6. The average water quality grade across North Dakota is C, based on data from 52 counties with available SDWIS data.
Is tap water safe to drink in Sheridan County?
Based on EPA SDWIS data, Sheridan County has a water quality grade of F (4.7/100). 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 Sheridan County have clean drinking water?
Sheridan County has 4 health-based drinking water violations according to EPA records. With a water quality score of 4.7/100 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 Sheridan County rank for water quality in North Dakota?
Sheridan County ranks #52 out of 52 counties in North Dakota by SDWIS water quality score (1 = best). With a score of 4.7/100, it falls in the bottom 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

Bottineau County

North Dakota

F

7.9

Water score

Burke County

North Dakota

F

9.4

Water score

Benson County

North Dakota

F

12.3

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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