North Slope County, Alaska
8 ZIP codes · Avg score 80/100 · Grade B · Updated 2026-06-03
Although county size varies, North Slope County's 8 ZIP codes share reliably safe tap water records and above-average compliance scores.
How North Slope County Compares
How North Slope County Compares
North Slope County scores 5 points above the Alaska state average (75/100) and 12 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: North Slope County, Alaska
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.3 (asthma 10.4%, diabetes 10.8%)
Estimated additional annual cost per homeowner: $430, driven primarily by energy_code_gap
Infrastructure: 0.471% avg pipe failure probability, 71% of ZIPs at high risk
55.6% of homes built before 1978 (lead paint era)
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: $430
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,390 housing units in North Slope 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 North Slope County
Remediation costs are relatively manageable for most homeowners in North Slope 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 North Slope 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 North Slope County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Barrow Utilities & Elec. Coop., Inc. (bu | 4,900 | 10 |
| 2 | The Water Service | 638 | 10 |
| 3 | NSBU - NUIQSUT | 443 | 5 |
| 4 | NSBU - WAINWRIGHT | 600 | 5 |
| 5 | Nsbu - Anaktuvuk Pass | 350 | 0 |
6 total water systems serve North Slope County.
All ZIP Codes in North Slope County
8 ZIP codes tracked in North Slope County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99721 | Anaktuvuk Pass | 99 | A | 0 | $138K |
| 2 | 99747 | Kaktovik | 99 | A | 0 | $102K |
| 3 | 99782 | Wainwright | 97 | A | 5 | $109K |
| 4 | 99789 | Nuiqsut | 97 | A | 5 | $132K |
| 5 | 99723 | Barrow | 87 | A | 10 (1 health) | $282K |
| 6 | 99791 | Atqasuk | 60 | C | 0 | $138K |
| 7 | 99734 | Prudhoe Bay | 50 | D | 0 | — |
| 8 | 99759 | Point Lay | 50 | D | 0 | $117K |
Recommended Buyer Guides for North Slope County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 55.6% of homes built before 1978
Deep Dive Reports
Detailed analysis for North Slope County, Alaska
Overview
North Slope County in Alaska covers 8 ZIP codes with an average Home Safety Score of B (80/100).
3 of 8 ZIP codes have recorded EPA violations. 1 health-based violation 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.