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County water report

Yukon-Koyukuk Census Area Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Yukon-Koyukuk Census Area, Alaska.

Water grade

F

Water score

0.3

State rank

#22

of 22

Health violations

314

EPA SDWIS, 5-year lookback

Watershed impaired

0.0%

81 water bodies assessed

Monitoring sites

53

11,681 recent measurements

Live streamflow

No gauge

YUKON R NR STEVENS VILLAGE AK

Water at a glance

Key Water Indicators for Yukon-Koyukuk Census Area

EPA SDWIS

Safety Grade

F

Score: 0.3 / 100

EPA SDWIS

Active Violations

314

5-year health-based lookback

EPA ATTAINS

Watershed Health

0% impaired

81 bodies assessed

USGS NWIS

Streamflow Snapshot

No gauge

YUKON R NR STEVENS VILLAGE AK

EPA WQP

Monitoring Sites

53

11,681 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.

0.3/100

Health violations

314

Health-based violations

Violations per 100K served

5688.4

Population-normalized SDWIS rate

Editorial analysis

Understanding Yukon-Koyukuk Census Area’s Water

Drinking Water Quality Overview

EPA SDWIS

Yukon-Koyukuk Census Area's water systems carry a failing grade, scoring 0.3 out of 100. Over the past five years, EPA SDWIS records 314 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). None of the assessed waterways are listed as impaired (0 of 81 water bodies) across Yukon-Koyukuk Census Area's watersheds. 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. Yukon-Koyukuk Census Area has extensive coverage with 53 active monitoring sites with 11,681 recent measurements on record. Predominant monitoring categories include physical and not assigned. 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 Yukon-Koyukuk Census Area

Water Verdict

Yukon-Koyukuk Census Area, Alaska receives a poor water quality assessment with a grade of F and a score of 0.3 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 track 81 water bodies in the county's watershed, none of which are currently listed as impaired under the Clean Water Act.

Violation Context

EPA SDWIS records for Yukon-Koyukuk Census Area, Alaska show 314 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 5688.4 violations per 100,000 people served, this rate is high and signals significant water quality management issues. This compliance record sits alongside an unusually deep monitoring archive: 11,681 water-quality results have been logged across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Yukon-Koyukuk Census Area has a Grade F compliance record with 314 health-based violations — among the highest levels in the country. Yukon-Koyukuk Census Area's drinking-water compliance score is 0.3 out of 100. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the Alaska Department of Environmental Quality or Health can expedite utility compliance action. With 53 active water-quality monitoring sites in Yukon-Koyukuk Census Area, data coverage is strong. A pipeline streamflow snapshot from the YUKON R gauge is also available on this page.

Regional Context

Yukon-Koyukuk Census Area has poorer water quality than the average county in Alaska. Its water score is 19.5 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 Yukon-Koyukuk Census Area's water environment

Official EPA Resources for Yukon-Koyukuk Census Area

EPA How's My Waterway

Interactive watershed health data for Yukon-Koyukuk Census Area

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Yukon-Koyukuk Census Area

Consumer Confidence Reports (AK)

Annual water quality reports from utilities in Alaska

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 81 assessed

Mostly healthy

Top Impairment Causes

No specific impairment causes reported for the assessed water bodies in this county.

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

53

Active in the past 5 years

Measurements Recorded

12K

11,681 total readings

Most Measured

  • Physical
  • Not Assigned
  • Inorganics, Minor, Metals

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).

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Safety Grade for Yukon-Koyukuk Census Area: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 Yukon-Koyukuk Census Area, Alaska?
Yukon-Koyukuk Census Area, Alaska has a drinking-water quality grade of F with a score of 0.3/100, based on EPA SDWIS compliance data. The county has 314 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 Yukon-Koyukuk Census Area?
Yukon-Koyukuk Census Area has 314 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 Yukon-Koyukuk Census Area?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Yukon-Koyukuk Census Area's 81 assessed water bodies are classified as impaired (0 impaired). 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 Yukon-Koyukuk Census Area?
EPA's Water Quality Portal records 11,681 measurements from 53 monitoring sites in Yukon-Koyukuk Census Area over the past five years. The most frequently measured characteristic groups are Physical, Not Assigned, Inorganics, Minor, Metals. 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 Yukon-Koyukuk Census Area water compare to the Alaska average?
Yukon-Koyukuk Census Area's SDWIS water quality score of 0.3/100 is lower than the Alaska state average of 19.8. The average water quality grade across Alaska is F, based on data from 22 counties with available SDWIS data.
Is tap water safe to drink in Yukon-Koyukuk Census Area?
Based on EPA SDWIS data, Yukon-Koyukuk Census Area has a water quality grade of F (0.3/100). 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 Yukon-Koyukuk Census Area have so many water violations?
Yukon-Koyukuk Census Area has 314 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 Yukon-Koyukuk Census Area rank for water quality in Alaska?
Yukon-Koyukuk Census Area ranks #22 out of 22 counties in Alaska by SDWIS water quality score (1 = best). With a score of 0.3/100, 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

Northwest Arctic Borough

Alaska

F

0.3

Water score

Lake and Peninsula Borough

Alaska

F

0.7

Water score

Nome Census Area

Alaska

F

1.0

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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