Septic in Horry County, SC

Last updated: Mar 21, 2026

From the salt air along the Grand Strand to the piney backroads inland, many Horry County homes rely on a septic system rather than a centralized sewer line. If you're new to the area, you'll quickly notice that septic is a common part of everyday life here.

Is septic common in Horry County? Should I expect septic if I own or buy a home?

Yes. In general, septic is the norm for homes outside municipal sewer lines. If your property sits inside a city limit or in a neighborhood served by a sewer system, you may be connected to public sewer. In many rural and suburban areas, though, a private septic system is standard. When you're buying, verify whether the home uses sewer or a septic tank. Check county records, ask the seller for septic permit history, and hire a qualified inspector to evaluate the tank and drain field.

Why homes typically use septic systems in Horry County

  • Soil and water considerations: sandy coastal soils drain well, but high groundwater and seasonal wet periods can challenge drain fields.
  • Practicality and cost: extending sewer lines to widely spaced lots along the coast and inland isn't always feasible or affordable.
  • Development patterns: decades of growth along the Grand Strand and surrounding areas created many homes outside existing sewer networks, including vacation homes and rural subdivisions.

County growth history and how that has impacted septic coverage

Horry County's population and development exploded since the 1990s, driven by tourism, retirees, and a growing second-home market. That surge produced a patchwork of neighborhoods, some tied into public sewer and many relying on private septic systems. As the county expanded, septic coverage became more varied: well-kept, newer systems in some areas; aging or stressed systems in others. That mix is part of everyday life here, and it's why reliable maintenance and proper sizing matter so much for long-term home value and neighborhood health.

High-level explanation (why septic exists here)

In short, septic exists here because a combination of sandy soils, variable water tables, and the cost and logistics of extending sewer to a sprawling county make on-site wastewater treatment a practical, common-sense solution for many homes.

In the following sections you'll find practical tips to inspect, maintain, and plan for septic in this part of the Lowcountry.

How Septic Is Regulated in Horry County

State Regulation of Onsite Wastewater in South Carolina

  • The South Carolina Department of Health and Environmental Control (DHEC) is the primary state regulator for septic systems. They establish the rules for design, installation, maintenance, and repair of onsite wastewater systems (OWS).
  • Key requirements include soil evaluation, system design by a licensed professional, and installation by a licensed installer. Permits for new systems, repairs, and replacements come from DHEC's Onsite Wastewater Program, with inspections carried out by DHEC or authorized county staff.
  • DHEC also sets setback distances, maximum tank and drainfield sizes, and parameters for mound systems, alternative designs, and pumping schedules to protect groundwater and surface water.

You can learn more at the official state page:

Local Regulation in Horry County

  • Horry County coordinates with DHEC on the regulation of septic systems, but local processes may add steps such as county-level permit review or inspections related to land development, zoning, or building activity.
  • Before installing, upgrading, or replacing an OWS, homeowners should check with local county offices to determine if any additional permits or inspections are required beyond the state permit.
  • The county's Environmental Services or Planning/Zoning divisions are common points of contact for local requirements, site evaluations, and follow-up inspections.

For county-level information, start at the county's official site:

Permits You'll Need

  • A state Onsite Wastewater permit is typically required for new systems, repairs, or replacements.
  • In Horry County, you may also encounter local permits or reviews tied to building, zoning, or environmental health. Always confirm both state and local requirements before starting work.
  • Expect a fee schedule and documented project plans, including a soils evaluation, system design, and installation method.

Steps to secure permits:

  1. Confirm sewer service status and site suitability with DHEC and the county.
  2. Hire a licensed designer to prepare a compliant system plan.
  3. Submit the design and permit application to DHEC; follow any local county submission steps.
  4. Obtain permit approval before starting work.

The Inspection Process

  • Inspections ensure the installation meets code and the system will function safely.
  • Typical inspection checkpoints:
    1. Pre-installation/site evaluation approval.
    2. Excavation and trench/bedding inspection after installation of trenches and components.
    3. Tank placement and backfill inspection.
    4. Final system inspection and as-built documentation.
  • Inspections may be conducted by DHEC staff or by county officials authorized to perform OWS inspections. If a problem is found, you'll receive a corrective action plan and a timeline to remedy it.

Ongoing Maintenance and Compliance

  • Homeowners are responsible for regular maintenance to keep the system functioning long-term.
  • Maintenance basics:
    • Have the septic tank pumped as recommended by the designer/installer (often every 3–5 years, depending on use and system type).
    • Protect the drainfield: keep vehicles and heavy equipment off, avoid planting trees near lines, and route downspouts away from the area.
    • Use water efficiently to reduce hydraulic loading; limit non-biodegradable chemicals and never flush hazardous substances.
    • Keep records of design, inspection, pumping, and repairs for reference and potential future permits.
  • If you suspect a problem (gurgling, damp soil, sewage odors, or backups), contact the appropriate regulator or a licensed septic service immediately.

Quick Tips for Homeowners

  • Verify whether your property has public sewer or septic service before purchasing or planning upgrades.
  • Always work with licensed professionals for design and installation; DIY work can lead to permit denials or improper function.
  • Maintain a simple file with all permits, inspection reports, and pump receipts for easy reference.
  • Schedule proactive inspections after major renovations or changes in water usage.

Helpful Resources

Soil, Groundwater & Environmental Factors in Horry County

Soil Conditions

Horry County sits in the Coastal Plain, where soils tend to be sandy and well-drained. This influences how quickly wastewater moves through the subsurface and where a septic system should be placed. Sandy soils can drain effluent rapidly, so proper design and adequate vertical distance to groundwater are especially important. Use official soil data to understand your property's profile.

  • Soils vary within small areas—check your exact address in official maps.
  • Avoid installing septic components on fill soils or highly organic deposits unless a qualified designer approves it.
  • Deeper, more permeable soils may require larger absorption areas or alternative systems to achieve proper treatment.

Official resources:

  • NRCS Web Soil Survey:
  • US NRCS soil data and maps (as above)

Flooding, Floodplains & Wetlands

Horry County's coastal location means flood risk and proximity to wetlands or streams can affect septic suitability and setbacks. Hurricanes and tropical storms can bring temporary waterlogging that impacts system performance.

  • Check flood zone designations for your property (FEMA map center: https://msc.fema.gov/portal/home'>https://msc.fema.gov/portal/home).
  • Avoid locating the drainfield in flood-prone zones or near wetlands and surface waters.
  • Ensure compliance with county and state setback requirements to protect groundwater and surface waters.

Environmental Considerations & Local Water Resources

Environmental factors like proximity to springs, streams, and coastal features influence septic design and operation. In coastal areas, groundwater movement and tidal influences can affect how effluent disperses.

  • Maintain appropriate setbacks from wells, property lines, and structures as mandated by state and local regulations.
  • If you live near sensitive environmental features, a licensed designer may recommend alternative systems or heightened monitoring.

Official resources:

Local Regulations & Resources

  • Setbacks and permitting for onsite systems are governed at the state level by SC DHEC and may be supplemented by county or city requirements. Always verify with the SC DHEC OWS program and your local authority before planning.

Official resources:

Practical Steps for Homeowners

  1. Find your property's soil type and depth to groundwater using the NRCS Web Soil Survey for your exact address.
  2. Determine your site's flood and wetland status with FEMA maps and local records.
  3. Talk to a licensed septic designer about soil conditions, groundwater depth, and appropriate system options (conventional, mound, or other alternative designs).
  4. Before installing or replacing a system, consult SC DHEC OWS guidelines for current setbacks and permitting requirements.
  5. If your ground is sandy, ensure adequate vertical separation from groundwater and consider a design that provides greater treatment or a raised/alternative absorption area.
  6. Plan for seasonal conditions: discuss how rainy seasons and potential groundwater rise could affect system performance with your designer.

Official resources:

Typical Septic System Types in Horry County

Conventional gravity systems

  • How they work: A septic tank separates solids and scum from wastewater; clarified liquid flows by gravity to a buried drain field with perforated pipes in gravel or proprietary media.
  • Where they fit: Common in soils with good percolation and adequate depth to groundwater or bedrock.
  • Pros: Simple design, reliable when soils are suitable, lower upfront cost than specialized systems.
  • Cons/limits: Needs a sizable, well-drained leach field; performance drops in high water tables, highly restrictive soils, or very shallow bedrock.
  • Quick maintenance notes: Have tank pumped every 3–5 years on average; protect the drain field from heavy vehicles and compaction; avoid adding fats, oils, and solids that can clog the tank.

Mound systems (raised/advanced drain fields)

  • How they work: If native soils don't percolate or water tables are high, a raised "mound" is built with a sand fill and a separate dosing system to distribute effluent up into the mound.
  • Where they fit: Common in coastal Horry County where soil is shallow or prone to saturation.
  • Pros: Allows a functioning system where conventional fields won't; can accommodate smaller lots with tight soils.
  • Cons/limits: Higher installation and maintenance costs; components (pumps, dosing) require power and more routine service.
  • Quick maintenance notes: Inspect dosing chamber and distribution lines; keep surface cover intact to minimize erosion and root intrusion.

Chamber systems (drainage chambers)

  • How they work: Replaces gravel with long plastic chambers that create wide, shallow distribute pathways for effluent.
  • Where they fit: Versatile in moderate soils; often used to shorten trench length and simplify installation.
  • Pros: Lightweight components, good load distribution, faster installation.
  • Cons/limits: Requires proper backfill and compaction control; performance still depends on soil permeability.
  • Quick maintenance notes: Monitor for clogging and solids buildup at tank outlet; routine pumping still applies.

Sand filter systems

  • How they work: Partially treated effluent from the tank passes through an above-ground or buried sand bed before reaching the drain field, often with filtration and a final dispersal step.
  • Where they fit: Used when soils are marginal or when additional treatment is desired before dispersal.
  • Pros: Improved effluent polishing; can extend life of a drain field in difficult soils.
  • Cons/limits: More complex and costly than a conventional system; requires regular inspection of the filter media.
  • Quick maintenance notes: Replace or refresh filter media as recommended by the installer; ensure the filter chamber remains accessible.

Aerobic Treatment Units (ATU) / Aerobic septic systems

  • How they work: Use aerators and specialized media to biologically treat wastewater, producing a higher-quality effluent that is typically discharged to a drain field or spray/advancement system.
  • Where they fit: Helpful where soils are poor, high water table, or where space is limited; common on properties with stringent setback requirements.
  • Pros: Better effluent quality, can reduce drain field size in some cases, supports certain advanced dispersal methods.
  • Cons/limits: Higher energy use and maintenance; requires regular servicing by a qualified technician.
  • Quick maintenance notes: Routine servicing, annual inspections, and prompt repair of any alarms or malfunctions are essential.

Low-Pressure Dose (LPD) and pressure distribution systems

  • How they work: A pump or timer delivers small, evenly spaced doses of effluent to the drain field, improving absorption in challenging soils.
  • Where they fit: Beneficial when percolation is uneven or trenches are long in sandy or restrictive soils.
  • Pros: More even dispersion; can protect the drain field in marginal soils.
  • Cons/limits: Adds mechanical components that require maintenance and occasional replacement.
  • Quick maintenance notes: Test the pump regularly; keep the dosing manifold accessible and free from debris.

Drip/dispersal and other advanced dispersal methods

  • How they work: Treated effluent is delivered through drip lines or specialized outlets to soil, reducing surface footprint and allowing precise absorption.
  • Where they fit: Selected sites with strict setbacks or sensitive landscapes.
  • Pros: Minimal surface disturbance; efficient use of space.
  • Cons/limits: Higher upfront cost and need for specialized design and maintenance.
  • Quick maintenance notes: Inspect emitters for clogging; protect lines from damage and keep irrigation zones separate from potable water uses.

How to choose (steps you can take)

  1. Get a soil and site evaluation from a licensed professional or your local health department to determine percolation and groundwater limitations.
  2. Compare lot constraints, including available space for a drain field and potential future expansion.
  3. Assess maintenance capacity: energy access for ATUs or LPDs, and willingness to service components regularly.
  4. Consult a qualified onsite wastewater contractor and verify permits with SC DHEC:
  5. Review treatment options against long-term costs and local performance, and discuss with your inspector before installation.

Resources

Typical Septic Issues Across Horry County

Common local conditions that influence septic performance

Coastal soils, seasonal rainfall, and the mix of home layouts here shape how septic systems behave. In Horry County, rapid weather shifts and varying groundwater levels can push problems to the surface if a system isn't sized, installed, and maintained properly.

  • High rainfall and a rising water table can saturate drainfields, leading to backups or puddling.
  • Sandy soils drain quickly, but that can carry effluent away from the drainfield if installation isn't matched to site conditions.
  • Proximity to wells or surface water can impose stricter setbacks and complicate drainfield placement.

Water-use overload and poor venting

A system that's sized for a typical occupancy can struggle when there are guests, frequent long showers, or lots of laundry. Excess water pushes solids through the tank too fast and can overwhelm the drainfield.

  • Flushable wipes, cat litter, and coffee grounds don't break down like toilet paper and can clog components.
  • A running toilet or leaking faucet wastes thousands of gallons annually.
  • Inadequate venting can make drains gurgle and slow down flow.

Steps to reduce overload:

  1. Space out heavy water use (laundry and baths) across days.
  2. Fix leaks and replace inefficient fixtures.
  3. Use a smaller garbage disposal or reduce food waste sent to the septic.

Root intrusion and landscape pressures

Trees and shrubs growing near a septic system can threaten pipes and the drainfield. Roots seek moisture and nutrients, which can cause cracks, blockages, or uneven distribution.

  • Roots can invade joints and cause slow drainage or backups.
  • Heavy equipment or impacted soil compaction around the drainfield harms performance.
  • Plantings directly over the drainfield should be avoided.

What to do:

  1. Maintain a clear setback between trees and the septic area.
  2. Have a licensed pro assess and, if needed, manage root intrusion.
  3. Keep vehicles off the drainfield and surrounding area.

Soil and drainfield challenges

Drainage and soil conditions drive how well effluent is treated and absorbed. Inconsistent soil absorption or a saturated field leads to standing water, odors, and surface wet spots.

  • Improperly designed or undersized drainfields fail more quickly under local rainfall loads.
  • Saturated soils reduce treatment efficiency and increase backups.
  • Compaction from construction or heavy use restricts pore space for infiltration.

How to address:

  1. Have percolation and soil tests performed during installation or major remodeling.
  2. Consider drainfield replacement or expansion if failures are confirmed.
  3. Schedule regular inspections after heavy rains.

Maintenance gaps and pumping intervals

Many septic failures come from missed maintenance. Regular pumping and component checks extend life and prevent expensive repairs.

  • Tanks need periodic pumping to remove solids that cannot be broken down.
  • Baffles, lids, and filters should be inspected for integrity and proper function.
  • Failing to pump every 3–5 years (or as recommended for your system) increases risk of solids reaching the drainfield.

Maintenance actions:

  1. Create a pumping schedule with a licensed septic contractor.
  2. Have a professional inspect the tank, baffles, and any filtration devices.
  3. Keep an updated record of service and notices of warning signs.

Chemicals, cleaners, and household practices

Harsh chemicals, solvents, or medications can disrupt the beneficial bacteria that treat wastewater. Pouring fats, oils, and grease into the system also hurts performance.

  • Avoid excessive chlorine or antibacterial cleaners.
  • Don't flush motor oils, paints, solvents, or pesticides.
  • Don't pour grease or coffee grounds down the drain.

Smart practices:

  1. Use septic-safe cleaners in moderation.
  2. Compost food waste instead of disposing via the septic system.
  3. Dispose of hazardous products through local household hazardous waste programs.

Signs that you should schedule an inspection

  • Slow drains, gurgling sounds, or frequent backups.
  • Wet areas or strong odors in the drainfield area.
  • A noticeable drop in system performance after heavy rain or high water use.

Official resources:

Septic Inspection, Permits & Local Oversight

Who regulates septic systems in Horry County

In South Carolina, on-site wastewater systems are governed by state rules, with local enforcement by county health offices. In Horry County, the Environmental Health program under the county, aligned with the SC Department of Health and Environmental Control (SCDHEC), handles permits, plan reviews, inspections, and record-keeping for septic systems. This ensures systems are designed, installed, and maintained to protect water quality and your home value.

Permits you may need

  • New septic systems: a permit is required before any excavation, soil testing, or installation begins.
  • Repairs or modifications: most significant changes to an existing system require an amended or new permit.
  • System abandonment or replacement: permits are needed to legally decommission old components and install a replacement.
  • Routine maintenance/service: pumping and routine servicing do not usually require a new permit, but keeping service records is wise.

What you'll need to apply

  • Property information: current deed or property description, and site address.
  • Site plan: a clear layout showing the proposed septic system, including the tank, drain field, setbacks from structures, wells, and watersheds.
  • Soil evaluation: a perc test and soils report completed by a licensed professional.
  • System design: proposed type (conventional, mound, I/A system, etc.), estimated daily flow, and component specs.
  • Supporting documents: any engineer or designer stamps if required by the county, plus payment for permit review.
  • Timing and fees: be prepared for review timeframes and current fee schedules; ask the office for a published checklist so you know exact submittal items.

The inspection process

  1. Apply for permit: submit the required forms, plans, and soil report to the Horry County Environmental Health Office.
  2. Plan review: county staff review the design for code compliance with state and local requirements.
  3. Permit issued: once approved, a permit is issued and construction can begin.
  4. In-progress inspections: during installation, inspectors visit at key milestones (for example, trenching, tank placement, and final bed or field installation) to verify compliance.
  5. Final inspection and approval: a final inspection confirms the system is properly installed and functioning; once approved, the permit is closed and records are filed.
  6. Record keeping: keep your permit number, final inspection approval, and all system drawings for future maintenance or resale.

Real estate transfers and disclosures

  • Buyer and seller awareness: ensure the septic system has current permits and a valid final inspection record. Real estate transactions may prompt a septic system evaluation and disclosure.
  • Licensed evaluations: lenders or title companies may require a licensed septic system evaluation before closing.
  • Maintenance history: providing pumping records and last service dates can help with financing and ongoing maintenance plans.

Maintenance, records & ongoing oversight

  • Keep all paperwork: permits, plans, inspection reports, and service receipts in one place.
  • Schedule routine maintenance: follow recommended pumping intervals and record dates; this helps prevent failures and protects property value.
  • Know who to call: when in doubt, contact the Horry County Environmental Health Office for guidance on permits, inspections, and records.

Resources and official references

  • SC DHEC On-Site Wastewater Program:
  • Horry County Government (Environmental Health and related departments): https://www.horrycounty.org
  • Horry County Planning or Environmental Health contact pages: use the county site search to reach the proper division quickly.

Cost Expectations for Septic Services in Horry County

Septic Tank Pumping and Cleaning

  • What it includes: removing accumulated sludge and scum, flushing lines as needed, inspecting tank baffles and overall integrity, and checking accessible components (lid, risers, cleanout).
  • Horry County notes: coastal soils and a higher water table can cause faster sludge buildup in some homes, leading to more frequent pump-outs. Regular pumping is especially important for homes with garbage disposals or heavy usage.
  • Typical cost in Horry County: about $250–$500 for standard tanks; larger tanks, grease traps, or homes with extra demands can push toward $500–$650.

Routine Maintenance and System Inspections (including Real Estate Transfers)

  • What it includes: visual inspection of the system, alarm checks, pump/float testing (for ATUs), and inspection of accessible components; real estate transfers may require a formal septic inspection or certification.
  • Horry County notes: many closings in the area require a septic certification or diagnostic report; local inspectors follow SC DHEC guidelines for real estate disclosures.
  • Typical cost: basic inspection $150–$300; more thorough diagnostics (with dye tests, camera inspection, and report) $350–$600.

Septic Tank Installation and System Replacement

  • What it includes: site evaluation, soil testing, tank installation or replacement, backfill, and final percolation/effluent disposal evaluation; permits and inspections coordinated with local authorities.
  • Horry County notes: coastal conditions often necessitate design choices suited to limited space, groundwater considerations, and sometimes mound or ATU options when absorption beds aren't suitable.
  • Typical cost: conventional system install $6,000–$12,000; mound/sand filter $15,000–$35,000; aerobic or advanced systems can range $10,000–$25,000 depending on site constraints.

Drain Field Repair and Replacement

  • What it includes: assessment of absorption area, replacement of failed trenches or sections, soil replacement or augmentation, and final testing of drainage performance.
  • Horry County notes: high groundwater or poor native soil in coastal zones can drive larger or redesigned drain fields, sometimes shifting to elevated mounds.
  • Typical cost: $2,500–$8,000 for repair or replacement of portions; extensive replacements can exceed $10,000.

Mound Systems (Sand Mounds) and Sand Filtration

  • What it includes: design, soil recommendation, installation of a mound or sand filtration bed, meets local setback and recharge requirements; annual maintenance may be required.
  • Horry County notes: often selected when native soil isn't suitable for conventional absorption due to high water table or limited depth to groundwater.
  • Typical cost: $15,000–$40,000 depending on size, depth, and site constraints.

Aerobic Treatment Units (ATUs) Maintenance

  • What it includes: regular service of the aerator, pumps, alarms, and control panels; periodic cleaning of components and routine effluent management; potential tank rehabilitation if needed.
  • Horry County notes: ATUs require ongoing service contracts to stay within permit limits and to avoid system failure in damp coastal conditions.
  • Typical cost: annual service $500–$1,200; full replacement or major component work $7,000–$18,000.

Grinder Pumps and Ejector Pumps

  • What it includes: installation or replacement of grinder/ejector pumps, associated control panels, alarms, and piping; service calls for jams or clogs.
  • Horry County notes: used where gravity sewers aren't feasible; proximity to water and sandy soils can affect pump longevity.
  • Typical cost: install $1,200–$3,500; service calls $150–$350.

Diagnostic Services: Dye Tests and Camera Inspections

  • What it includes: dye tracing to identify leaks or misconnections, video inspection of lines, locating and mapping pipes, and report generation.
  • Horry County notes: helpful for pinpointing failures in dense coastal lots or during real estate transactions.
  • Typical cost: dye test $100–$350; camera inspection $150–$350.

Permitting, Design, and Local Inspections

  • What it includes: site design plans, soil evaluation, permit applications, and scheduling of inspections with SC DHEC and Horry County.
  • Horry County notes: permit fees and inspection schedules vary by project scope and year; coastal regulations can influence design choices.
  • Typical cost: design/plan review $1,000–$3,000; permitting fees typically add several hundred to a few thousand dollars depending on project.

Real Estate Transfer Certification

  • What it includes: a certification or detailed report documenting current system status for closing.
  • Horry County notes: a common requirement for property sales in the area; results can influence closing timelines.
  • Typical cost: $150–$350.

Official resources:

Cities & Communities in Horry County With Septic Systems

Myrtle Beach

  • Very limited septic needs, but you may encounter septic issues if your property isn't yet connected to the city sewer, or if you're dealing with an aging or failed system on a parcel that stayed on septic longer than expected.
  • Common reasons septic services are needed here:
    • A home or rental unit on a septic tank awaiting sewer hookup.
    • Signs of a failing system: sewage odors, slow drains, gurgling toilets, or soggy, standing water near the leach field after rain.
    • Maintenance needs like regular pumping, tank inspections, or drain-field repairs due to soil conditions, high groundwater, or root intrusion.
  • If you suspect a septic problem in Myrtle Beach area:
    1. Confirm whether your property is actually connected to the city sewer with the local Public Works or Utilities office.
    2. Schedule a professional septic inspection and pumping if indicated.
    3. Have the system evaluated for possible drain-field repair or replacement if the tank is in good condition but the field is failing.
    4. Check for any city-led sewer expansion plans that may affect your property and timelines.

North Myrtle Beach

  • Primarily sewer-served, but some older or rural pockets remain on septic. You might need septic services when buying property outside the central sewer lines or if a home on septic shows performance problems.
  • Typical service scenarios:
    • Pumping and inspection for an older tank that's still on septic.
    • Drain-field evaluation after repeated backups or soggy yard areas.
    • System upgrades or replacements when property boundaries or soil conditions complicate expansion to sewer.
  • Steps to take if septic needs arise:
    1. Verify sewer status with local utilities.
    2. Get a licensed septic contractor to assess tank, baffles, and leach field.
    3. Plan for pumping and potential repairs or field replacement if needed.
    4. Consider long-term maintenance scheduling to prevent future failures.

Surfside Beach

  • Similar pattern: most of the town uses sewer, but septic systems persist in older neighborhoods or on recently subdivided lots not yet connected.
  • Why you may need septic services:
    • Aging tanks approaching end of life.
    • Drain-field troubles from seasonal high water or soil conditions.
    • Post-purchase inspections revealing hidden septic issues.
  • Action steps:
    1. Confirm sewer connection status with the town or county.
    2. Schedule a tank pump and full system evaluation.
    3. If field replacement is required, plan with a licensed contractor and permit authority.
    4. Maintain a regular pumping schedule to extend system life.

Unincorporated/Horry County Areas (Aynor, Loris, Longs, Socastee, and surrounding rural pockets)

  • These areas are more likely to rely on septic than on centralized sewer in certain parcels. You'll encounter septic service needs when buying land, building, or renovating in zones not yet sewered, or when existing systems fail.
  • Common service needs:
    • Tank pumping, effluent filtration, or pump replacements.
    • Drain-field evaluation for soil suitability, groundwater impact, or tree root intrusion.
    • System upgrades to comply with updated codes or to support additional bathrooms or a detached dwelling.
  • How to proceed:
    1. Check with Horry County or your local governing body about sewer expansion projects affecting your neighborhood.
    2. Hire a licensed septic contractor to perform a full OSS assessment (tank, risers, baffles, leach field).
    3. Plan for pumping and any necessary repairs or field reconstruction.
    4. Establish ongoing maintenance with a routine pumping schedule and seasonal inspections.

Official resources and guidance:

  • SC Department of Health and Environmental Control (DHEC) On-Site Sewage Systems:
  • U.S. Environmental Protection Agency on septic systems: https://www.epa.gov/septic

Note: For local sewer connection status and any county-specific septic programs, refer to the official Horry County and city pages, and contact the appropriate public works or environmental health offices.

Septic vs Sewer Across Horry County

Understanding the basics

In Horry County, homeowners typically fall into two camps: those connected to a municipal sewer system and those with their own onsite septic system. A sewer connection sends all wastewater to a centralized treatment plant, while a septic system treats wastewater on-site in a buried tank and drain field. Availability and costs depend on your exact location, local utilities, and soil conditions.

Pros and cons at a glance

  • Sewer (centralized)
    • Pros: Minimal on-site maintenance, predictable monthly bills, typically higher resale appeal.
    • Cons: Monthly/annual service fees, potential rate increases, service outages or capacity constraints can affect you.
  • Septic (on-site)
    • Pros: Lower fixed monthly costs once installed, independence from sewer outages, feasible in rural or unserved areas.
    • Cons: Requires regular pumping and inspections, potential costly repairs, failures can harm groundwater and soil.

Availability and how to check

  • Not every property in Horry County has sewer service. Availability depends on your exact address and the local utility's service boundaries.
  • How to check:
    • Contact the county or your municipality to verify sewer service status for your property.
    • Look up service areas with the official county site or your city's public works department.
  • Official resources:
    • Horry County Government:

Costs and long-term considerations

  • Central sewer
    • Upfront: Typically a hookup or connection fee charged by the utility.
    • Ongoing: Monthly sewer charges (and possible rate increases over time).
  • Septic
    • Upfront: System installation costs (tank, drain field, permits, and contractor fees).
    • Ongoing: Pumping every 3–5 years (usage-dependent), occasional maintenance or repairs, and monitoring for groundwater impact.
  • Environmental and property value considerations
    • A well-maintained septic is less taxing on municipal infrastructure but requires regular care to prevent leaks.
    • Sewer connections can simplify maintenance but tie you to utility rates and service reliability.

Steps to evaluate and decide (quick guide)

  1. Verify service status for your address.
    • Use the county/municipal contact or the official Horry County site.
  2. Compare long-term costs.
    • Estimate annual sewer charges vs. septic pumping/maintenance.
  3. Consider soil and site conditions.
    • Soil tests or percolation tests can influence septic viability.
  4. Get professional quotes.
    • Obtain a septic inspection if you already have a system; request sewer connection quotes if you're within a service area.
  5. Check permits and timelines.
    • Moving from septic to sewer (or vice versa) involves permits, inspections, and workload with the utility and local building department.

Moving from septic to sewer or upgrading service

  1. Confirm sewer availability for your property with the local utility or county planning office.
  2. Hire a licensed contractor to install any necessary lateral lines and complete the connection.
  3. Obtain required permits and schedule inspections as dictated by local codes.
  4. Transition to service, including final meters and accounting with the utility.

Maintenance and best practices

  • Septic systems
    • Schedule regular pumping (typical range: every 3–5 years, usage-dependent).
    • Avoid flushing non-debris items, fats, oils, and chemicals that can disrupt the tank's biology.
    • Protect drain fields from heavy vehicles, trees, and roots.
  • Central sewer
    • Monitor for blockages or backups and report issues to the utility promptly.
    • Budget for potential rate changes and occasional service outages.

For official guidance on onsite wastewater in South Carolina, see SC DHEC's Onsite Wastewater program: https://scdhec.gov/environment/onsite-wastewater