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Septic System Installation in Myrtle Beach, SC

Horry County County · 0 providers · Avg. $3,500 - $20,000

About Septic System Installation in Myrtle Beach

Septic system installation is a major construction project that involves designing and building an underground wastewater treatment system customized for your property. The process begins with a percolation (perc) test, where a soil scientist or engineer evaluates how quickly your soil absorbs water — this determines which system type is appropriate. Conventional gravity systems work well in areas with good drainage and adequate soil depth, while properties with high water tables, clay soils, or limited space may require engineered alternatives like mound systems, aerobic treatment units (ATUs), or drip distribution systems. Installation involves excavating for the tank, laying distribution pipes, constructing the drain field, and connecting the household plumbing. The entire process typically requires permits from your local health department, inspections at multiple stages, and a licensed installer. Costs vary dramatically by region, soil conditions, and system complexity — from $3,500 for a basic conventional system to over $20,000 for an engineered aerobic unit. Proper installation by a licensed professional is critical: a poorly installed system can contaminate groundwater, fail prematurely, and create expensive legal liability.

What Myrtle Beach Homeowners Should Know

Local Soil Conditions: Wando and Lakeland soil series are the primary upland soils in the Myrtle Beach area — excessively drained, deep Entisols with fine to medium sand throughout the profile. These soils offer excellent percolation (less than 3 minutes per inch in many locations) but minimal treatment capacity for nutrients and pathogens. Closer to tidal creeks, the Waccamaw and Paxville soils — poorly drained, organic-matter-rich Ultisols and Histosols — have water tables within inches of the surface and cannot support conventional drain fields.

Water Table: Upland Wando soils have water tables at 5–10 feet on barrier island ridges and inland terraces. However, proximity to the coast means tidal fluctuations influence groundwater elevation within 0.5–1 mile of tidal waters, and storm surge events can temporarily elevate water tables across wide areas. Low-lying pocosins and Carolina bay wetlands throughout Horry County maintain near-surface water tables year-round.

Climate Impact: Myrtle Beach has a humid subtropical climate with hot, humid summers and mild winters. Annual rainfall averages 52 inches with a summer peak from June through August driven by afternoon thunderstorms and tropical weather. Hurricane season (June–November) is a major concern — Horry County has experienced significant septic system damage from multiple landfalling storms including Floyd (1999), Matthew (2016), and Florence (2018), which caused prolonged flooding across the county's flat coastal plain.

Signs You Need Septic System Installation

  • Building a new home without access to municipal sewer
  • Existing system has failed beyond repair
  • Adding significant square footage or bedrooms to your home
  • Converting a property from dry well or cesspool to modern septic
  • Local regulations require system upgrade or replacement

The Septic System Installation Process

  1. 1 Site evaluation and percolation test by a licensed soil scientist
  2. 2 System design by a licensed engineer based on soil and household size
  3. 3 Obtain permits from the county or state health department
  4. 4 Excavate the tank pit, distribution box area, and drain field trenches
  5. 5 Set the tank, connect inlet/outlet pipes, and install the distribution system
  6. 6 Backfill, grade the site, and restore landscaping
  7. 7 Schedule required inspections and obtain final approval

No Septic System Installation providers listed yet in Myrtle Beach

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Frequently Asked Questions — Myrtle Beach

Why is Horry County the fastest-growing county in South Carolina and what does that mean for septic?
Horry County has been adding 20,000–30,000 residents annually, driven by in-migration of retirees and remote workers attracted to the Grand Strand's cost of living and climate. The rapid growth has pushed residential development into inland Horry County townships — Loris, Aynor, Conway, Green Sea — where municipal sewer does not reach. DHEC's Myrtle Beach regional office processes among the highest volumes of new residential septic permits in South Carolina, and the pace of approvals can mean 4–8 week wait times during peak construction season.
How do shellfish harvesting areas affect septic permitting near Myrtle Beach?
SC DHEC designates Shellfish Condemnation Areas around tidal waters where shellfish harvesting is restricted due to water quality concerns, including bacterial contamination from septic systems. Properties within or near these areas face additional DHEC review, larger setback requirements from tidal waters and tidal wetlands, and sometimes requirements for enhanced treatment systems. If you are purchasing coastal Horry County property within 200–500 feet of a tidal creek, ask your contractor to verify DHEC shellfish condemnation area mapping before designing a system.
What happened to Myrtle Beach-area septic systems during Hurricane Florence in 2018?
Hurricane Florence (2018) caused record flooding across Horry County, with some areas under 3–5 feet of floodwater for more than a week. Hundreds of septic systems were damaged — tanks floated, drain fields were saturated for extended periods, and floodwater contaminated with sewage entered many homes. DHEC issued emergency guidance and expedited repair permits in the aftermath. The experience underscores the importance of anchoring tanks properly in high water table areas and having systems inspected after any flood event.
Is the Myrtle Beach area growing fast enough to get municipal sewer service soon?
Myrtle Beach Area Water and Sewer Authority (MBAWSA) is actively expanding its service territory as the Grand Strand grows, but the pace of development far outstrips sewer extension capacity. Many inland Horry County communities — particularly in the Loris, Aynor, and Green Sea areas — are unlikely to receive sewer service within the next 10–20 years. If you are purchasing property in these areas, design your septic system for long-term use rather than expecting to connect to sewer soon.
How much does a septic system cost in Horry County?
Conventional gravity systems in compliant Wando sand locations cost $5,500–$9,500 in Horry County. Alternative systems required near shellfish areas, wetlands, or on lots with Paxville or other restricted soils typically run $11,000–$21,000. DHEC permit fees in Horry County are $200–$450 depending on system type. Horry County's competitive contractor market — driven by high construction volume — tends to keep installation prices slightly below the state average for comparable system types.

Other Services in Myrtle Beach

🌿Drain Field Repair🍳Grease Trap Pumping🔍Septic Inspection🚽Septic Tank Pumping🔧Septic Repair💧Well Drilling⚙️Well Pump Repair🔬Well Water Testing💦Well Water Treatment