Fremont County, Wyoming
15 ZIP codes · Avg score 51/100 · Grade D · Updated 2026-06-03
Within Fremont County's 15 monitored ZIP codes, water quality data indicates below-average safety — independent testing is a reasonable precaution.
How Fremont County Compares
How Fremont County Compares
Fremont County scores 4 points below the Wyoming state average (55/100) and 17 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Fremont County, Wyoming
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 10.8%, diabetes 12.2%)
Estimated additional annual cost per homeowner: $639, driven primarily by wildfire
Infrastructure: 0.394% avg pipe failure probability, 38% of ZIPs at high risk
67.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Fremont County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 10 violations. Past 5 years: 23 total (23 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: $639
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
17,463 housing units in Fremont 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 Fremont County
Remediation costs are relatively manageable for most homeowners in Fremont 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 Fremont 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 Fremont County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | B&k Mobile Home Park | 200 | 42 |
| 2 | Mountain View Acres | 165 | 42 |
| 3 | Gardens North Homeowners Association | 300 | 42 |
| 4 | City of Riverton, | 10,330 | 26 |
| 5 | Sunridge Estates | 220 | 26 |
16 total water systems serve Fremont County.
All ZIP Codes in Fremont County
15 ZIP codes tracked in Fremont County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 82515 | Hudson | 70 | B | 0 | $188K |
| 2 | 82520 | Lander | 69 | C | 3 (1 health) | $318K |
| 3 | 82513 | Dubois | 66 | C | 3 (1 health) | $362K |
| 4 | 82310 | Jeffrey City | 65 | C | 9 (1 health) | — |
| 5 | 82649 | Shoshoni | 64 | C | 1 | $154K |
| 6 | 82501 | Riverton | 54 | D | 26 (7 health) | $226K |
| 7 | 82523 | Pavillion | 54 | D | 16 (4 health) | $226K |
| 8 | 82510 | Arapahoe | 40 | D | 0 | $178K |
| 9 | 82512 | Crowheart | 40 | D | 0 | — |
| 10 | 82514 | Fort Washakie | 40 | D | 0 | $95K |
| 11 | 82516 | Kinnear | 40 | D | 0 | $136K |
| 12 | 82524 | Saint Stephens | 40 | D | 0 | — |
| 13 | 82630 | Arminto | 40 | D | 0 | — |
| 14 | 82638 | Hiland | 40 | D | 0 | — |
| 15 | 82642 | Lysite | 40 | D | 0 | $417K |
Recommended Buyer Guides for Fremont County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 67.6% 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 Fremont County, Wyoming
Overview
Fremont County in Wyoming covers 15 ZIP codes with an average Home Safety Score of D (51/100).
6 of 15 ZIP codes have recorded EPA violations. 14 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.
What You Can Do
Fremont County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
67.6% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.