Koyukuk, AK: 64 Violations — 79/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Koyukuk tap water earns a high safety grade — above-average compliance with AK and federal standards.
How Koyukuk Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Koyukuk Residents
- Your city's water systems recorded 64 violations in the past 5 years.
- Average lead level: 0.0055 mg/L.
- Homes built before 1986: 59% — older plumbing may contain lead solder.
- CDC health risk index: 16.56 — above typical levels.
Koyukuk's Water Providers
Water service in Koyukuk, AK is organized around a single utility — one of 1 tracked by regulator, and the one that manages the local distribution network while holding primary responsibility for EPA compliance reporting.
Overview
We track water quality and home safety data for 1 ZIP code in Koyukuk, Alaska (population ~44), covering 1 community water system serving approximately 85 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Koyukuk: B (79/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Koyukuk water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0055 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 60 | 1 |
| Revised Total Coliform Rule | Microbiological | 42 | 1 |
| Stage 1 DBP Rule | Treatment Technique | 8 | 1 |
| Surface Water Treatment Rule | Treatment Technique | 8 | 1 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 6 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 99754 | B | 64 | 0 | Koyukuk Safewater Facility |
All ZIP Codes in Koyukuk
- 99754 [B] — 64 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Koyukuk Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
What's in Koyukuk's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Koyukuk Infrastructure Age
With 59% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The character of Koyukuk's housing stock is one of deep historical layering — a median build year of 1987 signals a city built largely before the plumbing era changes of 1986 and 1970. Lead-soldered copper joints and, in the oldest properties, lead service lines are commonly present in this inventory. That context shapes what individual water testing may reveal, particularly in neighborhoods where the oldest housing is concentrated.
Over half of homes in Koyukuk were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Koyukuk: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
In recent monitoring under the Lead and Copper Rule, citywide samples for Koyukuk have approached or crossed the regulatory action level on multiple occasions. Combined with 59% of stock dating from the pre-rule era, the picture supports baseline single-tap reads as a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Koyukuk, AK