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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

Yes

Professional Install

Required

Minimum Tank Size

900 gal

Tank Size Requirements

BedroomsMin Tank SizeWith Garbage Disposal
31,000 gal1,500 gal
41,200 gal1,800 gal
1-2900 gal1,350 gal
5-61,500 gal2,250 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

Visit Official Website
919-707-5864
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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Disclaimer: This calculator provides estimates only and should not be used as the sole basis for septic system design. Always consult with licensed septic professionals and local health department officials before installing or modifying a septic system. Local codes may have stricter requirements than state minimums.

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