Natrona County, Wyoming
13 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-03
Within Natrona County, safety data across 13 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Natrona County Compares
How Natrona County Compares
Natrona County scores 2 points above the Wyoming state average (55/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Natrona County, Wyoming
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.7 (asthma 10.3%, diabetes 11.3%)
Estimated additional annual cost per homeowner: $740, driven primarily by wildfire
Infrastructure: 0.332% avg pipe failure probability, 15% of ZIPs at high risk
51.8% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Natrona County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 14 total (14 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: $740
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
36,990 housing units in Natrona 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 Natrona County
Remediation costs are relatively manageable for most homeowners in Natrona 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 Natrona 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 Natrona County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Casper, | 59,000 | 47 |
| 2 | Evansville, Town of | 2,728 | 41 |
| 3 | Pioneer Water & Sewer District | 1,500 | 41 |
| 4 | Vista West Water Company | 1,600 | 35 |
| 5 | Natrona County Int'l Airport | 375 | 35 |
12 total water systems serve Natrona County.
All ZIP Codes in Natrona County
13 ZIP codes tracked in Natrona County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 82609 | Casper | 67 | C | 7 | $281K |
| 2 | 82636 | Evansville | 67 | C | 6 | $266K |
| 3 | 82644 | Mills | 67 | C | 6 (3 health) | $168K |
| 4 | 82635 | Edgerton | 66 | C | 1 | $26K |
| 5 | 82643 | Midwest | 66 | C | 0 | $70K |
| 6 | 82602 | Casper | 63 | C | 7 | — |
| 7 | 82605 | Casper | 63 | C | 7 | — |
| 8 | 82601 | Casper | 62 | C | 7 | $244K |
| 9 | 82604 | Casper | 62 | C | 7 | $271K |
| 10 | 82620 | Alcova | 40 | D | 0 | $426K |
| 11 | 82640 | Linch | 40 | D | 0 | $603K |
| 12 | 82646 | Natrona | 40 | D | 0 | — |
| 13 | 82648 | Powder River | 40 | D | 0 | — |
Recommended Buyer Guides for Natrona County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Lead Paint Test Kits — 51.8% 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
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Natrona County, Wyoming
Overview
Natrona County in Wyoming covers 13 ZIP codes with an average Home Safety Score of C (57/100).
8 of 13 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Wyoming 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.