Costilla County, Colorado
7 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-04
In current tracking cycles, Costilla County — spanning 7 ZIP codes — records above-average water quality outcomes; the county's compliance history over recent years shows few departures from federal standards.
How Costilla County Compares
How Costilla County Compares
Costilla County scores 11 points above the Colorado state average (60/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Costilla County, Colorado
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.1 (asthma 10.4%, diabetes 17%)
Estimated additional annual cost per homeowner: $791, driven primarily by energy_code_gap
Infrastructure: 0.381% avg pipe failure probability, 43% of ZIPs at high risk
63% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Costilla County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 6 total (6 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: $791
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,090 housing units in Costilla 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 Costilla County
Remediation costs are relatively manageable for most homeowners in Costilla 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 Costilla 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 Costilla County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Garcia Domestic Wua | 100 | 7 |
| 2 | SAN LUIS WSD | 629 | 4 |
| 3 | Costilla County Ws | 561 | 4 |
| 4 | Viejo San Acacio | 45 | 4 |
| 5 | San Acacio Domestic Water Authority | 40 | 4 |
7 total water systems serve Costilla County.
All ZIP Codes in Costilla County
7 ZIP codes tracked in Costilla County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 81123 | Blanca | 83 | B | 0 | $124K |
| 2 | 81151 | Sanford | 83 | B | 0 | $157K |
| 3 | 81134 | Garcia | 81 | B | 7 (2 health) | — |
| 4 | 81152 | San Luis | 81 | B | 4 | $136K |
| 5 | 81133 | Fort Garland | 63 | C | 0 | $259K |
| 6 | 81126 | Chama | 53 | D | 0 | $168K |
| 7 | 81138 | Jaroso | 53 | D | 0 | — |
Recommended Buyer Guides for Costilla County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 63% of homes built before 1978
Deep Dive Reports
Detailed analysis for Costilla County, Colorado
Overview
Costilla County in Colorado covers 7 ZIP codes with an average Home Safety Score of B (71/100).
2 of 7 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← 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.