Septic pumping in Williamsburg County, South Carolina costs $250-$500 (avg $350). A new septic system installation costs $5,050-$10,100. USDA soil data rates 0% of county soils as suitable for septic absorption fields. Approximately 5,957 homes in this county use septic systems.
Septic System Costs in Williamsburg County
| Service | Low | Average | High |
|---|---|---|---|
| Pumping / Cleaning | $250 | $350 | $500 |
| Routine Inspection | $200 | $250 | $350 |
| Real Estate Inspection | $350 | $500 | $700 |
| Minor Repair | $650 | $900 | $4,400 |
| Conventional Installation | $5,050 | $7,200 | $10,100 |
| Aerobic System Installation | $9,450 | $13,500 | $18,900 |
| Drainfield Replacement | $5,050 | $7,200 | $10,100 |
| Perc Test | $750 | $1,100 | $1,550 |
Cost estimates based on regional market data for Williamsburg County, South Carolina. Actual costs depend on system type, site conditions, and provider.
Soil & Septic Suitability in Williamsburg County
Drainage Class
Poorly drained
Hydrologic Group
B/D
Unique Soil Types
44
Dominant Soil Types
| Soil Series | Coverage | Drainage | Hydro Group |
|---|---|---|---|
| Emporia | 283 | Well drained | C |
| Candor | 193 | Somewhat excessively drained | A |
| Chisolm | 187 | Well drained | A |
| Hornsville | 186 | Moderately well drained | C/D |
| Hobcaw | 148 | Very poorly drained | B/D |
Septic Tank Absorption Field Suitability
USDA NRCS rates soil suitability for septic absorption fields across this county:
Overall rating: Very limited
Groundwater & Water Table in Williamsburg County
Monitoring Wells
2
Avg Depth to Water
85 ft
Median Depth
90.3 ft
Shallowest Recorded
64.9 ft
Water table depths in this county are generally favorable for conventional septic systems.
Source: USGS National Water Information System. Based on 9 measurements from monitoring wells.
Septic Regulations & Permits in Williamsburg County
State Regulatory Body
South Carolina DHEC
Inspection Required for Home Sale
No / Varies
Nitrogen Reduction Areas
No
Advanced Treatment Required
In designated areas
DHEC issues permits statewide. Soil evaluation required for new installations.
Contact the Williamsburg County health department for current permit requirements, fees, and approved system types.
Septic System FAQ for Williamsburg County
How much does septic pumping cost in Williamsburg County?
Septic pumping in Williamsburg County, South Carolina typically costs between $250 and $500, with an average of $350. Costs vary by tank size (1,000-1,500 gallons is typical), ease of access, distance from the pumping company, and how full the tank is. Most homeowners should pump their tank every 3-5 years.
How much does a new septic system cost in Williamsburg County?
A conventional septic system installation in Williamsburg County typically costs $5,050-$10,100. An aerobic treatment unit (ATU) costs $9,450-$18,900. Given the predominantly poorly drained soils in this area, some sites may require alternative system types. Costs include the tank, drainfield, permits, and labor.
Do I need a permit for a septic system in Williamsburg County?
Yes. Virtually all counties in South Carolina require a permit before installing, repairing, or replacing a septic system. The permit process typically involves a soil evaluation or percolation test, system design by a licensed professional, application to the county health department, and one or more inspections during installation. Contact the Williamsburg County health department for current requirements and fees.
What soil types are in Williamsburg County and how do they affect septic systems?
Williamsburg County has predominantly Emporia, Candor, Chisolm soils. The dominant drainage class is Poorly drained with hydrologic group B/D. The USDA rates 0% of surveyed soils as "Not Limited" for septic absorption fields, 12% as "Somewhat Limited", and 88% as "Very Limited".
How often should I pump my septic tank in Williamsburg County?
The EPA recommends pumping your septic tank every 3-5 years for a typical household. The exact frequency depends on tank size, household size, and water usage. A 1,000-gallon tank serving a family of 4 should generally be pumped every 3 years. With approximately 5,957 septic systems in Williamsburg County, there are many local providers offering regular pumping services.
Can I install a conventional septic system in Williamsburg County?
It depends on your specific site. USDA soil data shows that 88% of soils in Williamsburg County are rated "Very Limited" for septic absorption fields, while only 0% are "Not Limited." This means many properties will require alternative systems such as mound systems, pressure distribution systems, or aerobic treatment units. A percolation test ($750-$1550) and soil evaluation are required before the county will approve a system design.
How long does a septic system last in Williamsburg County?
A well-maintained septic system in Williamsburg County typically lasts 25-30 years, though some components may need attention sooner. The concrete septic tank itself can last 40+ years, while the drainfield — the most critical and expensive component — usually lasts 15-25 years depending on soil conditions (Williamsburg County has predominantly poorly drained soils). Regular pumping every 3-5 years and avoiding excess water usage are the two most effective ways to extend system life.
Data last updated: 2026-04-13