Canyon County, Idaho
16 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
EPA monitoring reports for Canyon County cover 16 ZIP codes and tell a largely reassuring story — compliance rates are high and health-based violations are far below the national norm.
How Canyon County Compares
How Canyon County Compares
Canyon County scores 6 points above the Idaho state average (66/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Canyon 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 (asthma 10.8%, diabetes 11.1%)
Estimated additional annual cost per homeowner: $669, driven primarily by wildfire
Infrastructure: 0.307% avg pipe failure probability
39.8% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Canyon County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 7 total (7 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: $669
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
84,087 housing units in Canyon 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 Canyon County
Remediation costs are relatively manageable for most homeowners in Canyon 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 Canyon 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 Canyon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Caldwell | 74,000 | 36 |
| 2 | NAMPA CITY OF | 100,200 | 36 |
| 3 | El Rancho Heights | 300 | 32 |
| 4 | Woodview Acres Property Owners | 245 | 28 |
| 5 | Caldwell Housing Authority | 1,100 | 24 |
29 total water systems serve Canyon County.
All ZIP Codes in Canyon County
16 ZIP codes tracked in Canyon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83676 | Wilder | 83 | B | 0 | $311K |
| 2 | 83626 | Greenleaf | 81 | B | 1 | $313K |
| 3 | 83641 | Melba | 80 | B | 4 | $415K |
| 4 | 83651 | Nampa | 77 | B | 4 | $313K |
| 5 | 83652 | Nampa | 77 | B | 4 | — |
| 6 | 83653 | Nampa | 77 | B | 4 | — |
| 7 | 83686 | Nampa | 77 | B | 4 | $382K |
| 8 | 83687 | Nampa | 77 | B | 4 | $370K |
| 9 | 83656 | Notus | 75 | B | 4 | $239K |
| 10 | 83644 | Middleton | 74 | B | 6 (1 health) | $392K |
| 11 | 83660 | Parma | 69 | C | 8 | $364K |
| 12 | 83605 | Caldwell | 65 | C | 8 | $301K |
| 13 | 83607 | Caldwell | 65 | C | 8 | $385K |
| 14 | 83606 | Caldwell | 62 | C | 8 | — |
| 15 | 83630 | Huston | 53 | D | 0 | — |
| 16 | 83648 | Mountain Home A F B | 53 | D | 0 | — |
Recommended Buyer Guides for Canyon 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 HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Canyon County, Idaho
Overview
Canyon County in Idaho covers 16 ZIP codes with an average Home Safety Score of B (72/100).
13 of 16 ZIP codes have recorded EPA violations. 1 health-based violation 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.