Marin County, California
42 ZIP codes · Avg score 100/100 · Grade A
ZipCheckup grade for Marin County: A.
Checked records flag no major concern; missing data is unknown.
High on the scale: Marin County (42 ZIP codes).
How Marin County Compares
How Marin County Compares
Marin County scores 24 points above the California state average (76/100) and 27 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: Marin County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.8 (asthma 9.4%, diabetes 10.2%)
Modeled additional annual cost estimate per homeowner: $3,690, largest modeled factor: Sea Level
77% of homes built before 1980 (lead paint was banned for residential use in 1978)
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 DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $3,690
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
111,551 housing units in Marin County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Health Outcomes vs National Average
CDC PLACES data for Marin County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Marin County ZIP codes
7 community water systems mapped to Marin County ZIP codes; EPA may list more systems serving the county.
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Show all 7 water systems
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Systems with the most violations in Marin County
2 water systems with violations in EPA records.
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All ZIP Codes in Marin County
42 ZIP codes tracked in Marin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 94901 | San Rafael | 100 | A | 0 | $1370K |
| 2 | 94903 | San Rafael | 100 | A | 0 | $1149K |
| 3 | 94904 | Greenbrae | 100 | A | 0 | $2000K |
| 4 | 94920 | Belvedere Tiburon | 100 | A | 0 | $2000K |
| 5 | 94924 | Bolinas | 100 | A | 1 | $2000K |
| 6 | 94925 | Corte Madera | 100 | A | 0 | $1702K |
| 7 | 94930 | Fairfax | 100 | A | 0 | $1152K |
| 8 | 94933 | Forest Knolls | 100 | A | 0 | $886K |
| 9 | 94937 | Inverness | 100 | A | 0 | $1537K |
| 10 | 94938 | Lagunitas | 100 | A | 0 | $1005K |
| 11 | 94939 | Larkspur | 100 | A | 0 | $2000K |
| 12 | 94941 | Mill Valley | 100 | A | 0 | $1990K |
| 13 | 94945 | Novato | 100 | A | 0 | $1094K |
| 14 | 94946 | Nicasio | 100 | A | 0 | $2000K |
| 15 | 94947 | Novato | 100 | A | 0 | $995K |
| 16 | 94949 | Novato | 100 | A | 0 | $1076K |
| 17 | 94957 | Ross | 100 | A | 0 | $2000K |
| 18 | 94960 | San Anselmo | 100 | A | 0 | $1589K |
| 19 | 94963 | San Geronimo | 100 | A | 0 | $1221K |
| 20 | 94964 | San Quentin | 100 | A | 0 | — |
| 21 | 94965 | Sausalito | 100 | A | 0 | $1493K |
| 22 | 94973 | Woodacre | 100 | A | 0 | $1111K |
| 23 | 94912 | San Rafael | — | — | — | |
| 24 | 94913 | San Rafael | — | — | — | |
| 25 | 94914 | Kentfield | — | — | — | |
| 26 | 94915 | San Rafael | — | — | — | |
| 27 | 94929 | Dillon Beach | — | — | $1564K | |
| 28 | 94940 | Marshall | — | — | 0 | — |
| 29 | 94942 | Mill Valley | — | — | — | |
| 30 | 94948 | Novato | — | — | — | |
| 31 | 94950 | Olema | — | — | — | |
| 32 | 94956 | Point Reyes Station | — | — | 0 | $2000K |
| 33 | 94966 | Sausalito | — | — | — | |
| 34 | 94970 | Stinson Beach | — | — | 1 | $1458K |
| 35 | 94971 | Tomales | — | — | 0 | $880K |
| 36 | 94974 | San Quentin | — | — | — | |
| 37 | 94976 | Corte Madera | — | — | — | |
| 38 | 94977 | Larkspur | — | — | — | |
| 39 | 94978 | Fairfax | — | — | — | |
| 40 | 94979 | San Anselmo | — | — | — | |
| 41 | 94998 | Novato | — | — | — | |
| 42 | 95950 | Grimes | — | — | 2 | — |
Recommended Buyer Guides for Marin County
Nothing on this list means a problem exists in your own home: the matches are drawn from county- and ZIP-level records, so a guide shows up because of an area signal, and only testing at your tap describes a specific household.
- Best Lead Paint Test Kits — 77% of homes built before 1980
Deep Dive Reports
Detailed analysis for Marin County, California
Overview
Marin County in California covers 42 tracked ZIP records with an average Home Safety Score of A (100/100) across 22 scored records.
3 of 27 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.