Ketchikan Gateway County, Alaska
6 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-04
Within Ketchikan Gateway County, 6 tracked ZIP codes reveal moderate water quality — national standards are generally met, with some documented exceptions.
How Ketchikan Gateway County Compares
How Ketchikan Gateway County Compares
Ketchikan Gateway County scores 19 points below the Alaska state average (75/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Ketchikan Gateway County, Alaska
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 10.9%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $832, driven primarily by sea_level
Infrastructure: 0.417% avg pipe failure probability, 17% of ZIPs at high risk
54.8% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Ketchikan Gateway County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 16 violations. Past 5 years: 30 total (30 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: $832
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,402 housing units in Ketchikan Gateway 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 Ketchikan Gateway County
Remediation costs are relatively manageable for most homeowners in Ketchikan Gateway 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 Ketchikan Gateway 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 Ketchikan Gateway County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Ketchikan Water, Truck 1 | 100 | 80 |
| 2 | Ketchikan Public Utilities | 8,937 | 68 |
| 3 | South Tongass Water Utility | 975 | 68 |
| 4 | Saxman | 450 | 68 |
| 5 | Vallenar View Mobile Home Park | 225 | 68 |
7 total water systems serve Ketchikan Gateway County.
All ZIP Codes in Ketchikan Gateway County
6 ZIP codes tracked in Ketchikan Gateway County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99950 | Ketchikan | 67 | C | 34 (4 health) | — |
| 2 | 99901 | Ketchikan | 65 | C | 34 (4 health) | $379K |
| 3 | 99928 | Ward Cove | 56 | C | 12 | — |
| 4 | 99540 | Indian | 50 | D | 0 | $360K |
| 5 | 99923 | Hyder | 50 | D | 0 | — |
| 6 | 99926 | Metlakatla | 50 | D | 0 | $161K |
Recommended Buyer Guides for Ketchikan Gateway County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 54.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Ketchikan Gateway County, Alaska
Overview
Ketchikan Gateway County in Alaska covers 6 ZIP codes with an average Home Safety Score of C (56/100).
3 of 6 ZIP codes have recorded EPA violations. 8 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.