Kusilvak County, Alaska
11 ZIP codes · Avg score 76/100 · Grade B · Updated 2026-06-03
In recent assessments, Kusilvak County's 11 ZIP codes record strong, consistent water safety outcomes.
How Kusilvak County Compares
How Kusilvak County Compares
Kusilvak County scores 1 points above the Alaska state average (75/100) and 8 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Kusilvak County, Alaska
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17.9 (asthma 14.7%, diabetes 16.5%)
Estimated additional annual cost per homeowner: $213, driven primarily by energy_code_gap
Infrastructure: 0.514% avg pipe failure probability, 91% of ZIPs at high risk
50.4% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Kusilvak County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 17 violations. Past 5 years: 49 total (49 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $213
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,794 housing units in Kusilvak County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Kusilvak County
Remediation costs are relatively manageable for most homeowners in Kusilvak County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Kusilvak County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Kusilvak County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Nunam Iqua Water System | 213 | 167 |
| 2 | Scammon Bay Water System | 637 | 119 |
| 3 | Alakanuk Water System | 570 | 102 |
| 4 | Kotlik Water System | 617 | 61 |
| 5 | St. Marys Water System | 548 | 46 |
11 total water systems serve Kusilvak County.
All ZIP Codes in Kusilvak County
11 ZIP codes tracked in Kusilvak County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99657 | Russian Mission | 87 | A | 18 (1 health) | $104K |
| 2 | 99563 | Chevak | 86 | A | 17 (2 health) | — |
| 3 | 99604 | Hooper Bay | 84 | B | 43 (3 health) | — |
| 4 | 99585 | Marshall | 83 | B | 26 (1 health) | $24K |
| 5 | 99632 | Mountain Village | 83 | B | 20 (1 health) | $22K |
| 6 | 99554 | Alakanuk | 82 | B | 102 (2 health) | — |
| 7 | 99650 | Pilot Station | 75 | B | 17 | $24K |
| 8 | 99658 | Saint Marys | 75 | B | 46 (2 health) | $110K |
| 9 | 99662 | Scammon Bay | 68 | C | 119 (7 health) | — |
| 10 | 99620 | Kotlik | 62 | C | 61 (9 health) | $75K |
| 11 | 99666 | Nunam Iqua | 55 | C | 167 (16 health) | — |
Recommended Buyer Guides for Kusilvak County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 50.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Kusilvak County, Alaska
Overview
Kusilvak County in Alaska covers 11 ZIP codes with an average Home Safety Score of B (76/100).
11 of 11 ZIP codes have recorded EPA violations. 44 health-based violations have been documented.
← Back to Alaska water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.