San Mateo County, California
37 ZIP codes · Home Safety Score unavailable · 0 of 37 tracked ZIP records scored · Updated
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: San Mateo County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 9.6 (asthma 8.5%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $4,050, driven primarily by sea_level
78.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across San Mateo County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 12 violations. Past 5 years: 28 total (28 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
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $4,050
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
275,533 housing units in San Mateo 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 San Mateo County
Remediation costs are relatively manageable for most homeowners in San Mateo 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 San Mateo County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving San Mateo County
8 community water systems serving San Mateo County.
Show all 8 water systems
22 total water systems serve San Mateo County.
Systems with the most violations in San Mateo County
1 water system with recorded EPA violations.
All ZIP Codes in San Mateo County
37 ZIP codes tracked in San Mateo County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 94002 | Belmont | — | — | 0 | $2000K |
| 2 | 94005 | Brisbane | — | — | 0 | $1127K |
| 3 | 94010 | Burlingame | — | — | 0 | $2000K |
| 4 | 94011 | Burlingame | — | — | — | |
| 5 | 94014 | Daly City | — | — | 0 | $980K |
| 6 | 94015 | Daly City | — | — | 0 | $1153K |
| 7 | 94016 | Daly City | — | — | — | |
| 8 | 94017 | Daly City | — | — | — | |
| 9 | 94018 | El Granada | — | — | 0 | $1405K |
| 10 | 94019 | Half Moon Bay | — | — | 0 | $1509K |
| 11 | 94020 | La Honda | — | — | 0 | $1158K |
| 12 | 94021 | Loma Mar | — | — | 0 | $1021K |
| 13 | 94025 | Menlo Park | — | — | 0 | $2000K |
| 14 | 94026 | Menlo Park | — | — | — | |
| 15 | 94027 | Atherton | — | — | 0 | $2000K |
| 16 | 94028 | Portola Valley | — | — | 0 | $2000K |
| 17 | 94030 | Millbrae | — | — | 0 | $1930K |
| 18 | 94037 | Montara | — | — | 0 | $1467K |
| 19 | 94038 | Moss Beach | — | — | 0 | $1113K |
| 20 | 94044 | Pacifica | — | — | 0 | $1212K |
| 21 | 94060 | Pescadero | — | — | 0 | $1338K |
| 22 | 94061 | Redwood City | — | — | 0 | $1938K |
| 23 | 94062 | Redwood City | — | — | 0 | $2000K |
| 24 | 94063 | Redwood City | — | — | 0 | $1077K |
| 25 | 94064 | Redwood City | — | — | — | |
| 26 | 94065 | Redwood City | — | — | 0 | $1847K |
| 27 | 94066 | San Bruno | — | — | 0 | $1199K |
| 28 | 94070 | San Carlos | — | — | 0 | $2000K |
| 29 | 94074 | San Gregorio | — | — | 0 | — |
| 30 | 94080 | South San Francisco | — | — | 0 | $1160K |
| 31 | 94083 | South San Francisco | — | — | — | |
| 32 | 94128 | San Francisco | — | — | 0 | — |
| 33 | 94401 | San Mateo | — | — | 0 | $1123K |
| 34 | 94402 | San Mateo | — | — | 0 | $2000K |
| 35 | 94403 | San Mateo | — | — | 0 | $1726K |
| 36 | 94404 | San Mateo | — | — | 1 | $1683K |
| 37 | 94497 | San Mateo | — | — | — |
Recommended Buyer Guides for San Mateo 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 Lead Paint Test Kits — 78.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for San Mateo County, California
Overview
San Mateo County in California covers 37 tracked ZIP records. No Home Safety Score is published because the required model evidence is incomplete for every tracked record; missing evidence is not treated as zero.
1 of 30 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. The available record reports no health-based violations for this measured scope.
← Back to California Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.