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2026 Rankings
San Luis Obispo County, California Home Safety Rankings - 31 ZIPs
Explore rankings under Home Safety Score model 4.0.0. Only ZIPs with all four required inputs are ranked; missing evidence is not imputed or reweighted.
San Luis Obispo County, California (California) includes 31 tracked ZIP codes and 30 mapped community water systems; confirm service for a specific address. Below are the water quality rankings for metro ZIPs with all required inputs.
Average Home Safety Grade: B (76/100)
| Grade | ZIP Codes | % |
|---|---|---|
| A | 0 | 0% |
| B | 8 | 67% |
| C | 4 | 33% |
| D | 0 | 0% |
| F | 0 | 0% |
Top 10 ZIP Codes by Home Safety Score
| Rank | ZIP | City | Score | Grade |
|---|---|---|---|---|
| 1 | 93401 | San Luis Obispo | 83 | B |
| 2 | 93405 | San Luis Obispo | 83 | B |
| 3 | 93409 | San Luis Obispo | 83 | B |
| 4 | 93428 | Cambria | 83 | B |
| 5 | 93433 | Grover Beach | 83 | B |
| 6 | 93444 | Nipomo | 83 | B |
| 7 | 93465 | Templeton | 83 | B |
| 8 | 93445 | Oceano | 78 | B |
| 9 | 93402 | Los Osos | 67 | C |
| 10 | 93422 | Atascadero | 67 | C |
10 Riskiest ZIP Codes
| Rank | ZIP | City | Score | Grade | Risk Factor |
|---|---|---|---|---|---|
| 1 | 93446 | Paso Robles | 59 | C | 12 violations |
| 2 | 93420 | Arroyo Grande | 62 | C | Lead above EPA action level |
| 3 | 93422 | Atascadero | 67 | C | — |
| 4 | 93402 | Los Osos | 67 | C | — |
| 5 | 93445 | Oceano | 78 | B | 37 violations |
| 6 | 93465 | Templeton | 83 | B | — |
| 7 | 93444 | Nipomo | 83 | B | 13 violations |
| 8 | 93433 | Grover Beach | 83 | B | — |
| 9 | 93428 | Cambria | 83 | B | 1 violation(s) |
| 10 | 93409 | San Luis Obispo | 83 | B | 1 violation(s) |
Most Common Contaminant Violations
| Contaminant | Violations | ZIPs Affected |
|---|---|---|
| Lead | 62 | 3 |
| Total Trihalomethanes (TTHM) | 16 | 2 |
| Selenium | 14 | 2 |
| Consumer Confidence Report Rule | 5 | 3 |
| Haloacetic Acids (HAA5) | 4 | 2 |
| Stage 2 DBP Rule | 4 | 2 |
| Stage 1 DBP Rule | 3 | 3 |
| Nickel | 2 | 1 |
Lead Risk
- Average of reported 90th-percentile lead results: 0.0048 mg/L (below EPA action level)
- 1 of 19 ZIP codes with known status exceed EPA lead action level
- 8% of housing built before 1950
- 24% of housing built before 1970
Cities in This Metro
- San Luis Obispo, CA — 8 ZIP codes
- Los Osos, CA — 2 ZIP codes
- Arroyo Grande, CA — 2 ZIP codes
- Atascadero, CA — 2 ZIP codes
- Grover Beach, CA — 2 ZIP codes
- Oceano, CA — 2 ZIP codes
- Paso Robles, CA — 2 ZIP codes
- Avila Beach, CA — 1 ZIP code
- Cambria, CA — 1 ZIP code
- Cayucos, CA — 1 ZIP code
- Creston, CA — 1 ZIP code
- Harmony, CA — 1 ZIP code
- Nipomo, CA — 1 ZIP code
- San Miguel, CA — 1 ZIP code
- San Simeon, CA — 1 ZIP code
- Santa Margarita, CA — 1 ZIP code
- Shandon, CA — 1 ZIP code
- Templeton, CA — 1 ZIP code
All 31 ZIP Codes Ranked
View complete ranking
| Rank | ZIP | City | Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 93401 | San Luis Obispo | 83 | B | 1 |
| 2 | 93405 | San Luis Obispo | 83 | B | 0 |
| 3 | 93409 | San Luis Obispo | 83 | B | 1 |
| 4 | 93428 | Cambria | 83 | B | 1 |
| 5 | 93433 | Grover Beach | 83 | B | 0 |
| 6 | 93444 | Nipomo | 83 | B | 13 |
| 7 | 93465 | Templeton | 83 | B | 0 |
| 8 | 93445 | Oceano | 78 | B | 37 |
| 9 | 93402 | Los Osos | 67 | C | 0 |
| 10 | 93422 | Atascadero | 67 | C | 0 |
| 11 | 93420 | Arroyo Grande | 62 | C | 37 |
| 12 | 93446 | Paso Robles | 59 | C | 12 |
| 13 | 93407 | San Luis Obispo | — | — | 0 |
| 14 | 93410 | San Luis Obispo | — | — | 0 |
| 15 | 93424 | Avila Beach | — | — | 0 |
| 16 | 93430 | Cayucos | — | — | 0 |
| 17 | 93432 | Creston | — | — | 0 |
| 18 | 93451 | San Miguel | — | — | 10 |
| 19 | 93452 | San Simeon | — | — | — |
| 20 | 93453 | Santa Margarita | — | — | 0 |
| 21 | 93461 | Shandon | — | — | — |
Data Sources
- Water quality: EPA SDWIS
- Housing: U.S. Census Bureau American Community Survey
- Flood: FEMA NFIP
- Flood scope: historical NFIP claim records and claim-rated-zone evidence; this is not current property-map coverage.
Reporting periods vary by source; the page metadata identifies this materialization.
Methodology
Model 4.0.0 averages SDWIS water compliance and UCMR5 PFAS within drinking water, then averages drinking water, county radon, and annual AQI as three equal domains. All four inputs are required. Score methodology → · Rankings methodology →
Model 4.0.0 averages SDWIS water compliance and UCMR5 PFAS within drinking water, then averages drinking water, county radon, and annual AQI as three equal domains. All four inputs are required. Score methodology → · Rankings methodology →
Disclaimer: Scores are based on EPA SDWIS reported data and are not a guarantee of current water safety. Water quality can change. For the most current information, contact your local water utility or request a Consumer Confidence Report.
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How to cite this page
APA
ZipCheckup. (2026). San Luis Obispo County, California Home Safety Rankings - 31 ZIPs. https://zipcheckup.com/rankings/metro/san-luis-obispo-california/
BibTeX
@misc{zipcheckup-rankings-metro-san-luis-obispo-california,
author = {{ZipCheckup}},
title = {{San Luis Obispo County, California Home Safety Rankings - 31 ZIPs}},
year = {2026},
url = {https://zipcheckup.com/rankings/metro/san-luis-obispo-california/}
}
Page version: October 2026.
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