Los Alamos County, New Mexico
3 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-04
Compared to state averages, Los Alamos County scores well — its 3 ZIP codes sit above the baseline for tap water quality.
How Los Alamos County Compares
How Los Alamos County Compares
Los Alamos County scores 8 points above the New Mexico state average (62/100) and 2 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 9.5 (asthma 8.8%, diabetes 8%)
Estimated additional annual cost per homeowner: $927, driven primarily by energy_code_gap
Infrastructure: 0.387% avg pipe failure probability, 33% of ZIPs at high risk
75% 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: $927
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
8,631 housing units in Los Alamos 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 Los Alamos County
Remediation costs are relatively manageable for most homeowners in Los Alamos 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 Los Alamos 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 Los Alamos County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Los Alamos Municipal Water System | 25,000 | 56 |
| 2 | Regina Mdwca | 705 | 56 |
| 3 | Cielo Lindo | 38 | 56 |
All ZIP Codes in Los Alamos County
3 ZIP codes tracked in Los Alamos County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 87544 | Los Alamos | 74 | B | 28 (3 health) | $445K |
| 2 | 87545 | Los Alamos | 72 | B | 28 (3 health) | — |
| 3 | 87547 | White Rock | 63 | C | 0 | $460K |
Recommended Buyer Guides for Los Alamos County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 75% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Overview
Los Alamos County in New Mexico covers 3 ZIP codes with an average Home Safety Score of B (70/100).
2 of 3 ZIP codes have recorded EPA violations. 6 health-based violations have been documented.
← Back to New Mexico 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.