Alamosa County, Colorado
3 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
For most households in Alamosa County, the 3 tracked ZIP codes show adequate but uneven water quality.
How Alamosa County Compares
How Alamosa County Compares
Alamosa County scores 4 points above the Colorado state average (60/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 11.6 (asthma 11%, diabetes 11.3%)
Estimated additional annual cost per homeowner: $510, driven primarily by flood
Infrastructure: 0.32% avg pipe failure probability
49% 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: $510
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,933 housing units in Alamosa 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 Alamosa County
Remediation costs are relatively manageable for most homeowners in Alamosa 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 Alamosa County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 3 systems in Alamosa County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Alamosa | 11,271 | 40 |
| 2 | East Alamosa | 1,453 | 40 |
| 3 | Lake Sanchez Estates | 34 | 40 |
All ZIP Codes in Alamosa County
3 ZIP codes tracked in Alamosa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 81102 | Alamosa | 72 | B | 20 | — |
| 2 | 81101 | Alamosa | 67 | C | 20 | $217K |
| 3 | 81146 | Mosca | 53 | D | 0 | $226K |
Recommended Buyer Guides for Alamosa County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Overview
Alamosa County in Colorado covers 3 ZIP codes with an average Home Safety Score of C (64/100).
2 of 3 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Colorado 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.