waterbycounty
EPA SDWIS

Yukon-Koyukuk Census Area Water Quality

Yukon-Koyukuk Census Area, Alaska

Water Grade

F

Water Score

0.3

Violations

314

State Rank

#22

of 22 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

F

Based on EPA compliance history and violation data

Water Score

0.3/100

Higher = better quality

Health Violations

314

Health-based violations

Violation Rate

5688.4%

Systems with violations

Water Advisory: Yukon-Koyukuk Census Area

Water Verdict

Yukon-Koyukuk Census Area 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.

Violation Context

Yukon-Koyukuk Census Area has recorded 314 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 5688.4 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of Yukon-Koyukuk Census Area are advised to use filtered or bottled water for drinking and cooking until water quality improves. A reverse-osmosis or activated-carbon filter certified to remove the contaminants listed in the utility's Consumer Confidence Report is recommended. With 314 recorded health violations, staying informed about utility communications and boil-water notices is especially important. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.

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.

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 this county's assessed water bodies.

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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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 live streamflow 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, 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 Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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