Cassia County, Idaho
6 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-04
Cassia County's tap water quality puts it in the upper tier nationally; the 6 ZIP codes here record few health-based violations.
How Cassia County Compares
How Cassia County Compares
Cassia County scores 5 points above the Idaho state average (66/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Cassia County, Idaho
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.5 (asthma 10.6%, diabetes 11%)
Estimated additional annual cost per homeowner: $995, driven primarily by energy_code_gap
Infrastructure: 0.4% avg pipe failure probability, 50% of ZIPs at high risk
62.5% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Cassia County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 14 total (14 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $995
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
8,849 housing units in Cassia 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 Cassia County
Remediation costs are relatively manageable for most homeowners in Cassia 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 Cassia 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 Cassia County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | OAKLEY CITY OF | 821 | 30 |
| 2 | Oakley Valley Water Corporation | 500 | 30 |
| 3 | Burley Water Department | 10,345 | 16 |
| 4 | Jbs Country Court | 140 | 16 |
| 5 | View Water Development Company | 112 | 16 |
9 total water systems serve Cassia County.
All ZIP Codes in Cassia County
6 ZIP codes tracked in Cassia County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83311 | Albion | 81 | B | 6 (2 health) | $281K |
| 2 | 83323 | Declo | 81 | B | 1 | $321K |
| 3 | 83346 | Oakley | 78 | B | 30 (4 health) | $222K |
| 4 | 83318 | Burley | 77 | B | 16 (2 health) | $249K |
| 5 | 83312 | Almo | 53 | D | 0 | $364K |
| 6 | 83342 | Malta | 53 | D | 0 | $291K |
Recommended Buyer Guides for Cassia County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 62.5% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Cassia County, Idaho
Overview
Cassia County in Idaho covers 6 ZIP codes with an average Home Safety Score of B (71/100).
4 of 6 ZIP codes have recorded EPA violations. 8 health-based violations have been documented.
← Back to Idaho 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.