Sourced from the Lexington County Zoning Ordinance (effective June 25, 2024), Lexington County Public Works Stormwater, the Dominion Energy Lake Murray Permitting Guidelines, the SC Rural Infrastructure Authority, and R.61-56 — last checked August 2026.
Who Issues Lexington County Septic Permits
This surprises people moving to South Carolina from almost anywhere else: Lexington 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.
Where the application goes: ATTN: OSWW, SCDES, 2600 Bull Street, Columbia, SC 29201
Statewide phone: 1-855-731-2504
Online: epermitting.des.sc.gov · Form: D-1740, rev. 07/2026
Field office serving Lexington County: State Park Health Center, 8500 Farrow Road Building 12, Columbia, SC 29203 — (803) 896-0620
The Fee Is $150 in Every County
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,” amended effective May 27, 2022. There is a $150 re-application fee if the instructions are not followed.
You may instead hire a Professional Soil Classifier privately, capped at “no more than three (3) times SCDES’s fee” — so up to $450. People use it to skip the queue, and the queue is real: a 700-permit backlog in April 2023, and coastal counties running six to fourteen weeks behind.
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Lake Murray: Dominion Energy Forbids Septic, It Does Not Permit It
This is the most misunderstood rule on the lake, and getting it right saves you a phone call to the wrong organization.
Lake Murray is a Dominion Energy South Carolina hydroelectric project operating under a federal FERC license, with shoreline management going back to a plan from 1975. Its Lake Murray Permitting Guidelines set the boundary at the 360-foot contour — the normal maximum pool elevation — and § IX.4(e) prohibits, below that contour or within vegetative buffer zones: “No septic tanks and/or drain fields.”
We found no Dominion shoreline lease requirement tied to septic approval. If someone tells you there is a lease gate for your septic system, ask them to cite it. Separately, the county’s own ordinance at § 21.21(k) permits private docks on Lake Murray waterfront with a maximum of five slips — a county rule about structures, again not about wastewater.
The County Repair Grant — and Its Honest Status
Lexington County Public Works Stormwater runs a septic repair grant program funded by Clean Water Act Section 319 money passed through SCDES via the Lexington Countywide Stormwater Consortium.
Worth reading the program’s own framing, because it tells you where you stand if you decline help: the application warns that “It is the responsibility of all homeowners to repair an improperly functioning septic system,” and that declining assistance does not remove that duty, because “an improperly functioning septic system is a public health nuisance.” The grant is an offer of money, not a change to the obligation.
In the meantime, the routes that are open are on our South Carolina septic financial assistance page.
A County Septic Fee Probably Exists — and We Will Not Guess At It
Two county fees we can confirm, both from a brochure revised September 24, 2019: a $30 decal for a new or relocated manufactured home on septic, and a $5 transfer fee for a used manufactured home placed on an existing system.
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).
- 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. On a Lake Murray shoreline lot, where the water table tracks the lake, that margin is the whole question.
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 meeting every setback. On a tight lot the reserve area is what fails, not the drainfield. On Lake Murray it is sharper still, because the reserve area must also sit above the 360-foot contour and outside Dominion’s vegetative buffer — see below.
Setbacks and Sizing
- 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
- 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. Lexington’s Zoning Ordinance, effective June 25, 2024, does something worth noticing at § 12.10: it expressly excludes septic tanks and individual wells from its definition of “utilities.” So an onsite system is not treated as infrastructure in the county’s own framework. We could not read the ordinance in full, so treat “no county septic lot-size rule” as partially verified rather than settled.
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. Every mandatory-connection distance in South Carolina is local.
The Lexington County Joint Municipal Water and Sewer Commission, established in 1993 with eleven member jurisdictions, serves “more than 50 square miles.” Investment continues: on May 27, 2025 the state Rural Infrastructure Authority awarded the Town of Chapin $1,074,414 and the LCJMWSC $2,000,000 for work at Swansea.
What We Could Not Confirm
The § 66-1 septic permit fee amount — covered above. The single most useful missing number on this page.
Whether the Zoning Ordinance sets a minimum lot size for septic. Our retrieval of the ordinance was truncated, so the absence of such a rule is partially verified only.
Whether the post-2020 revision of the Lake Murray guidelines changed § IX.4(e). The version we read is marked “Revision Effective 2020.” And no count or percentage of Lexington County homes on septic exists at any vintage. SCDES office hours are not published for any office, including Columbia.
Where Lexington County Sits
Lexington sits directly across the Saluda from Columbia, wrapped around the southern and western shores of Lake Murray, with fast suburban growth in Irmo, Chapin, Lexington and Cayce and rural land beyond. The lake is what makes it distinctive: a federally licensed utility boundary that removes part of many waterfront lots from septic consideration entirely.
Nearby counties we cover: Newberry County · Kershaw County · Clarendon County. All of them run through the same state permit and the same $150 fee — what differs is the local ordinance layer, compared on our South Carolina septic permits by county page.
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