SepticRecord

Barnwell County

Septic services in Williston, South Carolina

Operators based within 12 miles of Williston

Listed by where the business is, not by who it says it serves. Every operator here was on the SCDES Onsite Wastewater Contractors list on the date its record shows, and the address it is placed by comes from that same list, so this is a checkable claim rather than a service-area promise. A South Carolina licence is issued by the state, not by a county, so operators further out can work here too; these are simply the ones closest to you.

Soil and septic suitability around Williston

The USDA has already rated this ground for exactly one use: a septic tank absorption field. Within 4 miles of Williston — 31,993 acres across 54 soil map units — it rates 58.6% of the land very limited for that use and 22.1% somewhat limited, leaving 18.8% with no rated limitation.

What the limitation actually is

A rating on its own tells you nothing you can act on. The reasons do, and around Williston the leading one is depth to saturated zone on 62.3% of the mapped area, followed by slow water movement on 60.3%. In full:

Limiting featureShare of areaWhat it means on site
Depth to saturated zone62.3%A seasonal water table sits too close to the surface
Slow water movement60.3%Water moves through the soil too slowly for a drain field to keep up
Seepage, bottom layer20.5%The layer beneath the trench is porous enough that effluent could reach groundwater without being filtered
Ponding10.3%Water stands on the surface
Flooding7.8%The site floods often enough to matter

Shares overlap: most soils here are limited for more than one reason at once, so these do not sum to 80.7%.

The soils themselves

The named soils and land types that make up most of the ground around Williston. Barnwell alone accounts for 24.1% of it.

Soil or land typeShareDrainageSlopeDepth to bedrockSeptic rating
Barnwell24.1% Well drained 2 to 10% None in profile Very limited
Wagram18.9% Well drained 0 to 10% None in profile Not limited
Blanton15% Somewhat excessively drained 0 to 10% None in profile Somewhat limited
Neeses7.5% Well drained 2 to 15% None in profile Very limited
Johnston6.8% Very poorly drained 0 to 2% None in profile Very limited

“None in profile” means SSURGO records no bedrock or other restrictive layer within the depth it describes, not that none exists.

Area of interest: a 4-mile radius around the USGS Geographic Names centre point for Williston (GNIS 2406891, 33.4017, -81.4219), chosen because five of this state's communities are unincorporated and have no boundary to use, and because the lots that need a septic permit are in the ring around a town rather than inside it. Soil from USDA-NRCS Soil Data Access, SSURGO interpretation “ENG - Septic Tank Absorption Fields”, area-weighted by mapped acreage and by each component's share of its map unit. Survey areas: Aiken County Area, South Carolina (2025-08-29), Barnwell County, South Carolina, Eastern Part (2025-09-02). Retrieved 2026-09-18.

This is a survey, not an evaluation of your lot. The permit decision rests on the site evaluation SCDES carries out for the specific parcel.

By service

Permitting in Barnwell County

Septic permitting in Barnwell County is handled by the State of South Carolina, through the Department of Environmental Services, not by the county. See the Barnwell County detail →