Sourced from the Edisto Island Watershed-Based Plan (December 2022), the Edisto Island Septic Assistance Program, Colleton County Planning and Development, and R.61-56 — last checked August 2026.
Who Issues Colleton County Septic Permits
This is the part that surprises people moving to South Carolina from almost anywhere else: Colleton County does not issue septic permits, and neither does any other South Carolina county. Onsite wastewater permitting is a state function.
The agency is the South Carolina Department of Environmental Services (SCDES), created on July 1, 2024 when Act 60 of 2023 split the old DHEC into SCDES for environmental programs and SC DPH for public health. Septic sits in SCDES’s Bureau of Regional and Laboratory Services.
Where the application goes: ATTN: OSWW, SCDES, 2600 Bull Street, Columbia, SC 29201
Statewide phone: 1-855-731-2504 (Onsite Wastewater Customer Service Center)
Online: epermitting.des.sc.gov
Form: D-1740, revision 07/2026
The Fee Is the Same in Every County: $150
Because permitting is centralized, there is one fee statewide. R.61-56 § 102.2: the Department “shall charge a fee of one hundred and fifty dollars ($150.00) to evaluate the site of a proposed onsite wastewater system.” That section was amended effective May 27, 2022. Payment is by check or money order to SCDES, and there is a $150 re-application fee if the application instructions are not followed.
There is a second route worth knowing about. You may hire a Professional Soil Classifier to do the evaluation privately, and the rules cap what they may charge at “no more than three (3) times SCDES’s fee” — so up to $450 (form DES 25-0011, dated 07/2025). People use it to skip the queue, and the queue is real: SCDES reported a 700-permit backlog in April 2023, and coastal counties have run six to fourteen weeks behind.
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Free Septic Repairs on Edisto Island
This is the most directly useful thing on this page, so it goes first.
Priority goes to: greatest financial need; failing or outdated systems; residents near impaired waterways; properties on flood-prone soils; and — unusually and commendably — heirs’-property owners and long-term rental occupants, two groups routinely excluded from home-repair assistance because they cannot produce a clean title or an owner-occupancy certificate.
Funding comes from a Healthy Harbors Fund grant awarded in summer 2022, a second Healthy Harbors grant, a three-year EPA Section 319 nonpoint source grant, and a 2024 Charleston County Community Investment grant. Specific dollar amounts are not disclosed.
Why the Program Exists
The Edisto Island Watershed-Based Plan, published December 2022, identifies failing and poorly maintained septic systems as the major source of bacteria in the watershed, and records that 24 monitoring locations across the watershed exceed acceptable bacteria and turbidity limits during at least part of the year.
That is the rationale, and it is also the reason the money is targeted rather than general: the grants pay to fix systems that are measurably affecting water quality. If your system is failing and you are in that watershed, your problem and the program’s purpose are the same problem.
The County’s Own Role Is Small but Real
Colleton County does not permit septic systems — SCDES does. But the county does gate utilities on it. Colleton County Planning & Development requires “a copy of the FINAL APPROVED septic tank permit and Termite Certificate… prior to Permanent Service.” No approved septic permit, no permanent power.
Colleton County Planning & Development: Post Office Box 98, Walterboro, SC 29488 — (843) 549-1709, Monday to Friday, 8:00am to 5:00pm. That is the county office, not the septic permitting agency — do not send your septic application there.
The Rule That Costs the Most Money: Six Inches
South Carolina requires a minimum vertical separation of six inches between the deepest point of effluent application and the zone of saturation — the level groundwater reaches — for systems under 1,500 gallons per day (R.61-56 § 200.3).
Six inches is remarkably little, and the comparison is the fastest way to understand it:
- South Carolina — 6 inches
- North Carolina — 18 inches on the coast, 12 inches inland
- Georgia — 24 inches
- Alabama — 24 inches
South Carolina permits systems on ground its neighbors would refuse. That is legal, and it is also why Colleton is Lowcountry and the Edisto watershed plan specifically prioritizes properties on “soils prone to flooding” — so the wet-season water table is the number that decides your lot.
The Repair Area Nobody Tells You About
Under R.61-56 § 200.7, a new system must reserve “a usable repair or replacement area equivalent to at least fifty (50) percent of the size of the original system” — 100 percent for community systems.
Read that as a land requirement, because that is what it is. Your lot has to hold the tank, the drainfield, and half a drainfield again in reserve, while still meeting every setback. On a tight lot that reserve area is what fails, not the drainfield itself. If you are in the Edisto watershed and your reserve area is the problem, read the assistance section above before you spend anything.
Setbacks and Sizing in Colleton County
These come from R.61-56 and apply identically statewide:
- 75 feet from a private well · 100 feet from a public well
- 75 feet from the mean high water line of a stream, canal or retention pond, and from a delineated critical area line (tidal waters and tidelands)
- 25 feet from a drainage ditch · 25 feet upslope of a basement
- 5 feet from a property line · 5 feet from a building
- Rock or a restrictive horizon must sit more than 12 inches below the deepest point of effluent application
There is no state minimum lot size for a septic lot. R.61-56 requires only that the lot be large enough to hold the system, the reserve area and the setbacks. We could not access Colleton County’s code, so whether the county imposes a minimum lot size or any rule stricter than the state is unverified. We want to be clear that this is a gap in our research, not a finding that Colleton has no such rule.
When Sewer Blocks a Septic Permit
R.61-56 § 300 is blunt: “Permits for new onsite wastewater systems shall not be issued where a wastewater treatment facility is accessible for connection,” and the same bar applies to repairing or replacing a failing system.
But the state sets no distance. “Accessible” is defined only negatively — “where annexation or easements to cross adjacent property are required to connect… the wastewater treatment facility shall not be considered accessible.” So if connecting would require you to be annexed, or to cross a neighbor’s land, sewer is not accessible and your septic permit stands.
We could not identify a countywide sewer utility for Colleton County. The Town of Edisto Beach operates its own water and sewer, but we could not verify how far that system extends. For most of the county, the practical answer is that there is no sewer to be accessible — but we are telling you that as an inference from an absence of records, not as a verified fact.
What We Could Not Confirm
Any Colleton County ordinance. We could not access the county code at all. Do not read this page as saying Colleton has no local septic rules — we simply could not check, and that is a meaningful difference.
Sewer service anywhere in the county except Edisto Beach, and even there we could not establish the extent of the system.
Grant dollar amounts in the Edisto assistance program, and the document date on the county’s building-permit requirements. Also: no septic count or percentage exists for Colleton County at any vintage.
Where Colleton County Sits
Walterboro anchors a large, rural, low-lying county running down to the ACE Basin and out to Edisto Island. It is the kind of county where public records are thin and the practical answer to most infrastructure questions is that there is no infrastructure — which makes the Edisto assistance program an unusually valuable exception worth knowing about.
Nearby counties we cover: Charleston County · Dorchester County · Beaufort County. All of them run through the same state permit and the same $150 fee — what differs is the local ordinance layer, which is compared on our South Carolina septic permits by county page.
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