Unalaska, AK: 11 Violations — 94/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
EPA compliance records for Unalaska tell a largely clear story: violation rates are low, health-based exceedances are uncommon, and the city's grade puts it well above average within AK.
How Unalaska Compares
Data: EPA SDWIS Last verified: 2026-06-03
Unalaska Water: The Quick Version
- Your city's water systems recorded 11 violations in the past 5 years.
- Average lead level: 0.0031 mg/L.
- Homes built before 1986: 40% — older plumbing may contain lead solder.
- CDC health risk index: 10.71.
Water Systems Serving Unalaska
Across most of Unalaska, AK, residential water comes from a single utility. That provider sets rates, manages infrastructure maintenance, and files compliance reports with the EPA on behalf of the households it serves. Federal tracking data shows 1 system on record, but one carries the bulk of the service load.
Overview
We track water quality and home safety data for 1 ZIP code in Unalaska, Alaska (population ~3,690), covering 1 community water system serving approximately 9,400 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 Unalaska: A (94/100)
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
Unalaska water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0031 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 | 6 | 1 |
| Chlorite | Disinfection Byproducts | 4 | 1 |
| E. coli | Microbiological | 4 | 1 |
| Revised Total Coliform Rule | Microbiological | 4 | 1 |
| Lead | Inorganic | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 99685 | A | 11 | 0 | Unalaska Water System |
All ZIP Codes in Unalaska
- 99685 [A] — 11 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.
CDC Health Data for Unalaska
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
Key Contaminants Detected in Unalaska
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Unalaska's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Prohibited from residential plumbing since 1986, lead solder divides Unalaska's housing stock along a timeline that the median build year of 1999 straddles. A meaningful share of homes predates the ban — a configuration that places moderate aggregate pressure on plumbing-related lead risk, distributed unevenly across neighborhoods.
Most homes in Unalaska were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Protecting Children from Lead in Unalaska
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.
Practically, the structural drivers in Unalaska — 40% pre-rule stock and citywide monitoring at or beyond the regulatory benchmark — make an in-home draw the practical way to translate aggregate averages into the specific conditions at one address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Unalaska, AK