Drain Field Repair & Replacement in Johnston County, NC
Johnston County's Environmental Health office in Smithfield charges nothing for a septic repair permit. That is unusual, and it matters in a county where wet soils are the main problem. NRCS data show a seasonal water table within about a foot of the surface on 150,166 acres, close to three in ten acres county-wide. Rains, Bibb and Wehadkee are among the most extensive soil series, alongside Norfolk, Gilead and Goldsboro.
Permits
Johnston County Environmental Health, 309 E. Market St, Smithfield, NC 27577, 919-989-5180. Fees effective July 1, 2026: septic permit ≤480 gal $600; >480 gal $700; existing-system upgrade/replacement $250; repair no charge; re-inspection $100.
Local conditions
Depth to saturated zone is a limitation on 348,409 acres. Flooding is a limitation on 91,139 acres, typical of bottomland series like Wehadkee and Bibb. Slow water movement is cited on 430,742 acres.
What drives local prices
- Fill or a raised system where the water table is shallow
- The $250 upgrade/replacement fee vs a free repair
- Pump systems ($50 pump fee) on wet lots
Common jobs
- Drain field replacement on high-water-table soils
- System upgrade/replacement ($250 permit)
- Pump system installation on wet lots
- Free repair permit work
Service area
Johnston County Environmental Health handles all septic permits.
Repair permits carry no charge—unusual for the region.
Communities: Smithfield, Clayton, Selma, Benson, Four Oaks, Kenly, Princeton, Pine Level, Wilson's Mills, Archer Lodge, Micro, Cleveland
If it is an emergency
For backups or surfacing sewage, call Johnston County Environmental Health at 919-989-5180. Repair permits carry no fee.
Questions about Johnston County
Is a septic repair permit really free in Johnston County?
The county fee page lists septic repair at no charge (effective July 1, 2026). Upgrading or replacing an existing system is $250.
Why are so many Johnston County lots hard to permit?
Wet soils. About 29% of the county's acreage has a seasonal water table within 30 cm, per NRCS.
Sources
- Johnston County Environmental Health Fee Page
- USDA NRCS Soil Data Access (NC101)
- NOAA NCEI U.S. Climate Normals 1991–2020 (USC00317994)
Fees and rules change; confirm with the permitting office. Run the estimator for a cost range.