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Johnston County Inspection Hours Mon - Fri 8:00 am - 5:00 pm  Mon - Fri 8:00 am - 5:00 pm  
Johnston County Inspection Phone 919-989-5060 919-989-5060

Johnston County Inspection Address 309 E. Market Street - Smithfield NC 27577 309 E. Market Street - Smithfield NC 27577  309 E. Market Street
Smithfield NC 27577 

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Grading plan Requirements on Septic Site Plans for Permits

Effective immediately from the Environmental Health Department, a grading plan shall be required on all site plans for septic permit applications where stem-wall or slab foundation construction is proposed.  The grading plan shall indicate the following to scale: 

  • limits of disturbance
  • cutting of soils
  • filling of soils
  • diversion swales and ditches

Please note: the Environmental Health office reserves the right to request additional information for adequate plan review and permit approval.

In the Johnston County home building market, EH has observed a trend from fewer crawlspace foundations, and more toward stem-wall/slab foundations.  An additional trend is the development of smaller lot sizes with larger homes dimensions.  All have led to less area for septic systems and repair areas.  This requirement has been initiated due to the combination of these trends stated above.

Slab/stem wall construction can have a higher degree of encroachment on the septic areas if left unexamined.  The grading (cutting/filling) around home site has caused a variety of complications.  Most concerning and problematic for all parties is the potential for these complications to lead to a revocation of the septic permit.  A revocation may initiate a stop work order from the local building inspections department.  We want to avoid these complications and feel obtaining grading plans prior to the issuance of a permit is a critical step in the permitting process.

For comments or concern, feel free to call 919-989-5180.








Page last updated: March 3, 2023

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