State Requirements
North Carolina Septic Tank Requirements
Complete guide to septic system requirements in North Carolina (NC). Use our calculator for personalized recommendations.
Regulatory Agency
North Carolina Department of Health and Human Services
Permit Required
YesProfessional Install
RequiredMinimum Tank Size
900 gal
Tank Size Requirements
| Bedrooms | Min Tank Size | With Garbage Disposal |
|---|---|---|
| 3 | 1,000 gal | 1,500 gal |
| 4 | 1,200 gal | 1,800 gal |
| 1-2 | 900 gal | 1,350 gal |
| 5-6 | 1,500 gal | 2,250 gal |
Drainfield Sizing by Soil Type
Minimum square feet of absorption area based on soil percolation rate:
Gravel/Sandy
100
sq ft minimum
Sandy
150
sq ft minimum
Loam
200
sq ft minimum
Clay
300
sq ft minimum
North Carolina Specific Notes
- Mountain region has rocky soil challenges
- Coastal areas have high water table issues
- Piedmont clay soils common
Regulatory Contact
North Carolina Department of Health and Human Services
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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