| Who issues the permit | SC Department of Environmental Services (SCDES), via ePermitting | County Board of Health, through the health district |
| Permit validity | 5 years | 12 months |
| Site evaluation fee | $150, set by regulation | Set by the county health district |
| Who does the soil evaluation | Certified department staff or a licensed Professional Soil Classifier | County environmental health staff |
| Final inspection | A Tier 3 installer may self-inspect their own installation | County Board of Health inspects before backfill, every time |
| Decision window | Varies | 20 days on a complete application |
| Tank sizing | 1,000 gal to 4 bedrooms, +250 gal per bedroom | Same, plus 50% additional capacity for a garbage grinder |
| Repair area | 50% reserve area required | Reserve area required |
| Well setback | 75 ft private well, 100 ft public well | Set by state rule and county |