State Requirements
California Septic Tank Requirements
Complete guide to septic system requirements in California (CA). Use our calculator for personalized recommendations.
Regulatory Agency
State Water Resources Control Board
Permit Required
YesProfessional Install
RequiredMinimum Tank Size
1,000 gal
Tank Size Requirements
| Bedrooms | Min Tank Size | With Garbage Disposal |
|---|---|---|
| 3 | 1,200 gal | 1,800 gal |
| 4 | 1,500 gal | 2,250 gal |
| 1-2 | 1,000 gal | 1,500 gal |
| 5-6 | 2,000 gal | 3,000 gal |
Drainfield Sizing by Soil Type
Minimum square feet of absorption area based on soil percolation rate:
Gravel/Sandy
125
sq ft minimum
Sandy
175
sq ft minimum
Loam
225
sq ft minimum
Clay
325
sq ft minimum
California Specific Notes
- Local agencies may have stricter requirements
- Coastal areas have special regulations
- Earthquake considerations for tank installation
Regulatory Contact
State Water Resources Control Board
Important Disclaimer
This information is provided for reference only. Local county or city requirements may be stricter than state minimums. Always verify requirements with your local health department before installation.
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