Septic in Chester County, SC

Here in Chester County, South Carolina, rolling farmland and quiet cul-de-sacs share space with growing neighborhoods that aren't always tied to a city sewer. If you're new to the area or looking at a home here, you'll likely encounter a septic system as the practical, on-site solution for wastewater.

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

Yes. Septic systems are very common in much of Chester County, especially in unsewered or partially sewered areas outside the town limits. If you own or are purchasing a home here, chances are you'll be looking at an on-site system. It's smart to treat the septic as a core part of the home's infrastructure: ask for the system's records, know when it was last pumped, and plan a maintenance schedule. If a property is near municipal sewer lines, you'll still want to confirm what the local authority requires for connections and future plans.

Why homes typically use septic systems in Chester County

• Rural and semi-rural layout: Much of the county isn't served by a centralized sewer grid, so on-site treatment makes development practical and affordable.
• Soil and terrain: Local soils and slopes influence how well liquids percolate and disperse, guiding the choice and placement of a septic system.
• Cost and feasibility: Extending sewer mains to every parcel can be costly and slow; septic provides a reliable, private option for homes on individual lots.
• Environmental responsibility: Properly sited and maintained septic systems protect groundwater and streams, which matters for Chester County's lakes, creeks, and soils.

County growth history and how that has impacted septic coverage

Chester County has long balanced agricultural heritage with new residential growth. For decades, many farms and timberlands transitioned to subdivisions, often in areas where sewer lines weren't feasible or planned for. As the Charlotte metro area influence grew, development crept into more rural corners, increasing the number of homes on septic or on small-scale municipal connections. That pattern means a robust on-site wastewater landscape remains common, with regulations and inspections evolving to keep systems safe and functioning as the county grows.

High-level explanation (why septic exists here)

On-site wastewater treatment exists here because local development, soil conditions, and infrastructure realities make centralized sewer access uneven. Septic systems provide a practical, relatively economical way to manage household waste while protecting the land and water that Chester County residents value.

That practical, neighborly approach—paired with clear maintenance steps—helps homes stay comfortable and dependable as the county continues to grow.

How Septic Is Regulated in Chester County

State oversight

South Carolina's Department of Health and Environmental Control (DHEC) regulates all on-site wastewater systems statewide. DHEC sets design, construction, operation, and maintenance standards; approves system designs; issues installation permits; and conducts inspections to ensure systems perform safely and protect groundwater and public health. The state program also provides guidance on proper maintenance and when to pump or repair components. For official details and forms, see the SC DHEC On-site Wastewater Program: ">SC DHEC On-site Wastewater Program.

Local administration in Chester County

In Chester County, local environmental health staff work with DHEC to administer on-site wastewater requirements at the county level. This includes site evaluations, plan review, permit issuance, inspections during and after installation, and enforcement of local codes in cooperation with the state program. Homeowners interact with the Chester County Health Department or its Environmental Health Office for permits, inspections, and guidance on maintaining a healthy septic system.

Permitting process for a new or replacement septic system

A typical pathway in Chester County follows state rules with local coordination. Here are the common steps:

1. Confirm regulatory pathway
   • State oversight via DHEC governs on-site wastewater, with local staff handling county-level permits and inspections as required.
2. Conduct a soil evaluation
   • A licensed professional performs percolation and soil suitability tests to determine the best system type and placement.
3. Prepare a system design
   • An on-site wastewater designer or licensed professional creates a plan tailored to your lot, home size, and soil conditions.
4. Submit for review and obtain permits
   • The design is submitted to DHEC and/or the county for review and permit issuance before work begins.
5. Hire a licensed installer
   • Installations must be performed by a contractor properly licensed for septic work in South Carolina.
6. Complete inspections
   • Local health staff inspect during installation and issue a final inspection certificate once the system is ready for use.

Inspections and ongoing maintenance

After installation, ongoing maintenance helps prevent failures and extends system life. Consider these practices:

• Pumping and maintenance
  • Most residential systems benefit from a pump-out every 3–5 years, depending on tank size, household usage, and sludge buildup.
• Regular inspections
  • Have accessible components (e.g., pump chamber, filters, inspection ports) inspected during routine maintenance or before heavy use seasons.
• Protect the drain field
  • Keep heavy equipment off the leach field, avoid deep planting with trees nearby, and prevent parking on the drain field.
• Water-use management
  • Fix leaks promptly; spread out laundry and water-heavy activities; use high-efficiency fixtures to reduce load on the system.
• Record-keeping
  • Maintain copies of permits, inspection reports, and pump-out receipts for reference and future compliance.

Common scenarios and how to handle them

• New home purchase with an existing septic system
  • Request recent inspection or pump-out records; plan a professional evaluation if you don't have up-to-date information.
• Odors, pooling, or soggy areas
  • Schedule an inspection promptly; these can indicate system distress or failure that may require repair or replacement.
• Planned additions or remodels
  • Check with local health staff early; larger loads or altered wastewater flow may require system modifications or a new design.

Resources

• SC DHEC On-site Wastewater Program: https://scdhec.gov/environment/onsite-wastewater

Soil, Groundwater & Environmental Factors in Chester County

Soil characteristics and septic performance in Chester County

• Soils in Chester County range from loams to clays, with infiltration rates that can vary widely from parcel to parcel. The speed at which effluent leaves the drainfield depends on texture, structure, and moisture.
• Restrictive layers matter. Shallow bedrock, dense clay, or perched water tables can limit drainage and affect treatment; these conditions often require specialized design.
• Soil depth to groundwater or seasonal wetness influences drainfield placement. In areas that wet up in certain seasons, a drainfield may saturate and underperform if not properly sized or elevated.
• Root intrusion and soil compaction can impede both absorption and distribution of effluent. Protect the area around a drainfield during landscaping or construction.
• Tools to preview local soils: NRCS Web Soil Survey lets you view soil types and mapped limitations for your Chester County property.
• When groundwater is shallow or drainage is poor, alternative designs (such as elevated systems) may be necessary. A licensed designer can determine appropriate options based on site conditions.

Environmental factors and site constraints

• Flood risk: Drainfields in flood-prone or low-lying areas may be damaged or fail during storms. Elevation, drainage, and site grading should be considered in system placement.
• Proximity to streams, wetlands, and surface water: Regulatory setbacks protect water quality and soil stability. Design plans should respect these zones and be reviewed by a licensed professional.
• Slopes and runoff: Steep or rapidly draining sites require careful design to prevent scouring and to ensure even effluent distribution.
• Drought and recharge: Prolonged dry spells can reduce soil moisture, while heavy rainfall can overwhelm soils that are slow to drain. Both conditions influence system performance and maintenance scheduling.
• Environmental stewardship: Consider planting native vegetation and avoiding chemical contaminants near the control and drainfield areas to protect soil and groundwater.

Regulations and planning steps (what homeowners should know)

• Work with a licensed onsite wastewater designer and obtain the necessary permits from DHEC. Official guidance and program requirements are here: https://www.scdhec.gov/environment/waste-management/onsite-wastewater
• Use soil mapping tools to understand site limitations before purchasing or building. NRCS Web Soil Survey is a primary resource: https://websoilsurvey.nrcs.usda.gov/
• For wells and water supply, verify setbacks and protection measures with local codes and DHEC. Proper planning reduces the risk of contamination and system failure.

Practical steps for Chester County homeowners (numbered)

1. Check soil conditions for your lot using the NRCS Web Soil Survey and note any restrictive layers or slow infiltration areas. https://websoilsurvey.nrcs.usda.gov/
2. Arrange a site evaluation with a licensed onsite wastewater designer to assess depth to groundwater, soil depth, slope, and drainage.
3. Consider flood risk and water proximity; identify elevated or well-drained locations if the site has drainage challenges.
4. Submit a design plan to DHEC for review and permits; ensure the plan accounts for local setbacks and environmental constraints. https://www.scdhec.gov/environment/waste-management/onsite-wastewater
5. Schedule regular maintenance after installation (pump schedules, inspections, and leak checks) to protect groundwater and prolong system life.

Quick tips

• Review soil maps before any excavation or landscaping near the drainfield.
• Avoid compacting soil around the disposal area; leave a protective buffer during yard work.
• If your lot is near a floodplain or stream, plan for an elevated or alternative system design with a licensed professional.
• Keep hazardous chemicals and disposal practices away from the drainfield to reduce groundwater risk.

Typical Septic System Types in Chester County

Conventional septic systems

• What it is: A traditional setup with a septic tank and a soil absorption field (drainfield) that relies on gravity or simple dosing.
• How it works: Wastewater enters the tank, solids settle, clarified liquid exits to perforated pipes buried in trenches, and soil treats the effluent.
• Best fit: Adequate, well-drained soils and enough space for a drainfield; typical for many single-family lots.
• Pros: Lower upfront cost; straightforward design and maintenance.
• Cons: Requires good soil conditions and sufficient space; performance drops with high water tables or restrictive soils.
• Maintenance notes: Regular pumping per professional guidance; protect the drainfield from heavy traffic and compacting; keep chemicals, solvents, and solids out of the system.
• Resources: Learn more about conventional systems from EPA at

Aerobic Treatment Units (ATU)

• What it is: A pre-treated system that uses aerobic bacteria to reduce waste before the effluent reaches the drainfield.
• How it works: An air-driven process mixes wastewater, enabling aerobic digestion; treated effluent then goes to a spray or shallow infiltrative field, sometimes with a secondary sand filter.
• Best fit: When soils are poor, shallow, or when space is limited and a smaller or denser drainfield is needed.
• Pros: Higher treatment efficiency; can enable smaller or alternative distribution fields; better performance in challenging soils.
• Cons: Requires electricity, regular professional service, and alarms; higher ongoing costs.
• Maintenance notes: Annual service by a licensed operator; monitor alarms and pump-outs as recommended.
• Resources: EPA overview of aerobic systems: https://www.epa.gov/septic/aerobic-treatment-systems; SC DHEC guidance: https://scdhec.gov/environment/onsite-wastewater-systems.

Mound systems

• What it is: A raised, manufactured drainfield built on top of the native soil using fill material (often sand) to create a suitable infiltration zone.
• How it works: Pre-treated effluent is discharged to the mound, where it percolates through the fill before reaching native soil.
• Best fit: Poor native soils, high groundwater, or shallow bedrock that prevent conventional drainfields.
• Pros: Expands sites where conventional systems won't work; protects groundwater with an engineered profile.
• Cons: Higher upfront cost; more complex design and monitoring; needs ongoing maintenance.
• Maintenance notes: Inspect for settling or surface cracking; avoid disturbing the mound; follow pumping and service schedules.
• Resources: EPA mound systems page: https://www.epa.gov/septic/mound-systems; SC DHEC guidance: https://scdhec.gov/environment/onsite-wastewater-systems.

Sand filter systems

• What it is: A secondary treatment bed (sand filter) that treats effluent before final disposal.
• How it works: Septic tank effluent flows to a sand filtration bed, where biological activity and filtration remove contaminants; treated effluent then disperses to the drainfield.
• Best fit: Sites with limited soil depth or high groundwater, or as a treatment enhancement in combination with other systems.
• Pros: Good additional treatment, useful when soils are marginal.
• Cons: Requires power for pumps or aeration; more parts to maintain.
• Maintenance notes: Regular inspection of the pump and filter bed; keep surface clean and free of debris.
• Resources: EPA information on sand filters: https://www.epa.gov/septic/sand-filter-systems; SC DHEC resources: https://scdhec.gov/environment/onsite-wastewater-systems.

Chamber systems and other alternatives

• What it is: Infiltration beds made from modular plastic chambers (no gravel), used as an alternative to traditional trenching.
• How it works: Chambers create a large infiltration area with a shallow profile, allowing quicker installation in tight lots.
• Best fit: Limited space or difficult soils where standard trenches aren't practical.
• Pros: Flexible layouts; lighter and easier to install than gravel beds.
• Cons: Design and installation must follow local rules; some counties require specific approvals.
• Maintenance notes: Inspect for settlement or damage; avoid heavy loads over the chamber area.
• Resources: EPA overview of alternative systems: https://www.epa.gov/septic/alternative-systems.

Low-pressure dosing and specialized distribution options

• What it is: Dosed delivery of effluent into multiple trenches to improve distribution on challenging terrains.
• How it works: A dosing pump delivers small, evenly spaced pulses to the trench network, enhancing soil absorption.
• Best fit: Sloped lots, long trenches, or soils with variable permeability.
• Pros: More uniform field performance, can extend usable area.
• Cons: Requires properly maintained dosing equipment and alarms.
• Maintenance notes: Regular checks of the dosing pump and controls; protect lids and access points.

Steps to help determine the right septic type (site-specific)

1. Obtain a soil evaluation (personnel licensed to perform percolation tests).
2. Have a licensed designer prepare a site-specific plan for Chester County soils and constraints.
3. Submit the plan to SC DHEC for approval and permitting.
4. Hire a licensed installer to implement the approved system and schedule routine maintenance.

Typical Septic Issues Across Chester County

Common causes of septic problems

• Aging systems wear out: septic tanks, lids, baffles, and drain-field components degrade over time, especially in older homes.
• Improper sizing or installation: systems designed for smaller households or higher water use can struggle, leading to early field failure.
• Tree roots and landscape: roots can invade pipes or clog drain fields, reducing drainage.
• Excessive water use and surges: frequent laundry, long showers, or full guest households can overwhelm the system.
• Poor waste disposal habits: flushing non-biodegradable items, fats/oils, and chemicals disrupt bacteria and clog components.
• Groundwater and soil issues: high water tables or clay soils slow drainage and saturate the drain field.

Warning signs homeowners may notice

• Slow drains and frequent backups in sinks, tubs, or toilets.
• Gurgling sounds in plumbing when water is draining.
• Sewage odors inside the house or around the drain field area.
• Wet, soggy spots or lush, green growth above the drain field.
• Unexplained patches of poor grass health or standing water in the yard.
• Alarms or warnings from a home septic pump system (if equipped).

Septic Tank and Baffle Issues

• Damaged or missing baffles allow solids to pass into the drain field.
• Cracked or leaking tanks can release wastewater to unintended areas.
• Inadequate pumping leads to solids buildup, reducing tank capacity and effectiveness.

Drain Field and Soil Absorption Problems

• Saturated soil due to heavy rainfall or high water table prevents proper effluent absorption.
• Compacted or clay-heavy soils slow percolation and raise the risk of system backup.
• Drain-field pipes or trenches clogged with solids or roots impair distribution.

Pumps, Alarms, and Other Components

• Submersible pumps or lift stations fail, causing backups or flood conditions.
• Alarm systems stop working due to dead batteries or wiring issues.
• Inaccessible or poorly located cleanouts hinder maintenance and inspections.

Quick steps to address a suspected issue

1. Note symptoms and potential causes to share with a pro.
2. Limit water use for 24–48 hours to see if the issue improves.
3. Check for obvious leaks (running toilets, dripping faucets) and fix them.
4. Schedule a professional septic pump-out and inspection.
5. Have the system evaluated for tank integrity, baffles, and drain-field performance.
6. Follow recommended repairs or replacements as advised by a licensed contractor.

Proactive maintenance to prevent problems

• Schedule regular pumping and professional inspections per local guidance.
• Use water-efficient fixtures and spread out laundry and dishwasher use.
• Only flush toilet tissue; dispose of wipes, fats, oils, grease, chemicals, paints, solvents, and medications safely at designated facilities.
• Protect the drain field: keep vehicles off, avoid tilling or planting deep-rooted trees nearby, and maintain a buffer of native vegetation.
• Inspect access lids and countersunk cleanouts to keep maintenance accessible.

When to call a professional

• You notice persistent backups, strong odors, or wet areas over the drain field.
• Alarms indicate a fault, or there is standing wastewater in the yard.
• Drains remain slow even after reducing water use and fixing minor leaks.
• You're unsure about tank pumping schedules, system layout, or repairs required.

Resources for Chester County homeowners

• SC Department of Health and Environmental Control (DHEC) Onsite Wastewater Program:
• U.S. Environmental Protection Agency (EPA) septic system information: https://www.epa.gov/septic

Septic Inspection, Permits & Local Oversight

Who regulates septic systems in Chester County, SC

• The primary statewide regulator is the South Carolina Department of Health and Environmental Control (DHEC) through the On-site Wastewater Program.
• Local oversight in Chester County is typically handled by the county's Environmental Health/Building Permits offices and may involve the county planning or health department staff.
• For both installation and repairs, you must meet state requirements and follow Chester County procedures.

When you need a permit

• New septic system installation or full replacement
• Major repairs to tanks, pumps, distribution boxes, or leach fields
• Substantial changes to home size or water usage that affect system hydraulics
• Real estate transactions often trigger a required septic evaluation or disclosure
• In some neighborhoods or zoning districts, county-issued permits and inspections may be required even for minor work

How to determine the right permit path

• Step 1: Call or check with the Chester County Building & Zoning/Environmental Health office to confirm who issues the permit for your project.
• Step 2: Confirm whether you need a DHEC on-site wastewater permit in addition to any county permit.
• Step 3: Gather basics: property survey or plat, soil information if you have a soil report, proposed system design, and any existing ISDS records.

How to apply (permitting process)

1. Identify the approving agency (often DHEC for ISDS design, Chester County for local permits and inspections).
2. Complete the application and pay the required fee.
3. Submit: site plan showing the proposed tank location, leach field, setbacks, and access; soil/perc test results if available; design details.
4. Undergo plan review. The reviewer may request clarifications or revision to the design.
5. Schedule and pass the necessary inspections during and after installation (see "Inspections" below).

The inspection process (what to expect)

• Pre-construction evaluation: confirm site suitability, setbacks, and access for installation.
• During installation: inspectors verify tank placement, proper bedding/compaction of backfill, risers, lids, piping, and baffles; verify pump chambers if present.
• Post-installation/final: verify proper grading and erosion control; ensure the system meets design specs and as-built drawings are provided.
• Re-inspections: if issues are found, corrections must be completed and re-inspected before final approval.

Real estate transactions: selling or buying with a septic system

• Many sales in Chester County require a septic system evaluation or clean-out pump report.
• Hire a licensed On-site Wastewater System Inspector to perform a formal ISDS evaluation; obtain a written report.
• If failures or deficiencies are found, plan and schedule required repairs before closing, if possible.
• Disclosure: be prepared to share the evaluation report with buyers and lenders.

Resources and official guidance

• South Carolina Department of Health and Environmental Control (DHEC) – On-site Wastewater Program:
• Chester County Government – Permits & Inspections: https://www.chestercountysc.gov
• Homeowner guidance for on-site wastewater systems (DHEC homeowner responsibilities): https://scdhec.gov/environment/water/onsite-wastewater/homeowners-guide

Cost Expectations for Septic Services in Chester County

Septic Tank Pumping and Cleaning

• What it includes: removing accumulated solids from the septic tank, removing sludge and scum, inspecting tank conditions (baffles, lids, cracks), and providing a service record. In Chester County, many homes rely on conventional tanks that benefit from regular pumping every 3–5 years depending on usage and household size.
• Chester County specifics: access can be affected by age of the system, lot layout, and yard conditions. If the site has limited access or tight spaces, equipment needs may raise the price a bit. If a tank is unusually large or has multiple compartments, cost can increase accordingly.
• Typical cost: roughly $250–$550 per pumping, depending on tank size, accessibility, and disposal fees.
• Steps to prepare (1–4):
  1. Locate the tank access lids and clear a safe path for equipment.
  2. Notify occupants to minimize water use on pumping day.
  3. Ensure pets and children are kept away from the work area.
  4. Review and keep the service receipt for your records.

Septic System Inspections and Certifications

• What it includes: visual inspection of the tank and components, verification of baffles and lids, assessment of the drain field, and review of electrical controls for any ATU (Aerobic Treatment Unit). In real estate transactions, a certified inspection is common and may include dye tests or camera inspection of lines.
• Chester County specifics: many local lenders require a septic inspection as part of a closing, and some homes use ATUs or mound systems that need explicit certification.
• Typical cost: $100–$300 for a standard inspection; higher if specialized testing or camera inspection is included.
• Steps to prepare (1–3):
  1. Provide access to tanks and control panels.
  2. Have recent system maintenance records available.
  3. Expect a written report with any recommended action.

Drain Field Evaluation and Repair

• What it includes: inspection of drain field performance (soil absorption, moisture signs, odors), dye tests if needed, and evaluation of drainage lines. If failure is suspected, options include field repair, distribution box adjustments, or replacement.
• Chester County specifics: soil conditions vary; clay-rich soils or shallow beds can constrain field performance and drive repair or replacement decisions.
• Typical cost: evaluation $300–$1,200; minor repairs $2,000–$8,000; major repairs or replacement $8,000–$40,000+, depending on field size and method (drain field rehab vs. mound system).
• Notes: cost can rise with necessary permits and soil testing requirements.

System Installation or Replacement

• What it includes: site design, permitting, tank installation, piping and distribution, drain field or mound construction, and electrical for any ATU. In Chester County, many homes require a state or county permit and soil/perc testing as part of the plan.
• Chester County specifics: soil restrictions and groundwater considerations often determine whether a conventional system or an enhanced treatment (ATU) or mound is needed.
• Typical cost: conventional install $8,000–$25,000; system replacement with mound/ATU $20,000–$60,000+ (costs vary with site constraints and tank size).
• Steps to prepare (1–4):
  1. Obtain soil/percolation tests if required.
  2. Work with a licensed designer to plan layout.
  3. Secure permits before work begins.
  4. Schedule inspections at key milestones.

Aerobic Treatment Unit (ATU) Maintenance

• What it includes: regular service to the aerator, blower, control panel checks, pump inspections, and effluent filtration if applicable; annual contracts are common.
• Chester County specifics: ATUs are common where site soils limit conventional absorption; routine maintenance is essential to prevent backups.
• Typical cost: $150–$600 per service, with annual service contracts ranging from $200–$600.
• Note: replacement parts (blowers, diaphragms) can add to costs if a failure occurs outside normal service.

Emergency Diagnostics and Repairs

• What it includes: rapid assessment for backups, gurgling, foul odors, or surface wet spots; diagnostic inspection of tank, lines, and field to identify the blockage or failure point.
• Chester County specifics: local weather and access issues can influence timing; emergency visits may incur a higher service call fee.
• Typical cost: diagnostic fee $100–$250 plus hourly labor if repairs are needed; pump-outs or line cleaning may add $150–$450.

Official Resources

• South Carolina Department of Health and Environmental Control (DHEC) Onsite Wastewater Program:
• U.S. Environmental Protection Agency – Septic Systems: https://www.epa.gov/septic
• Licensing and contractor due diligence: when hiring, verify state licensing and references; request written estimates and a clear scope of work.

Septic vs Sewer Across Chester County

Septic basics for Chester County homes

Chester County homes traditionally rely on on-site septic systems. A typical setup includes a buried septic tank that holds wastewater and a drain field where liquid seeps into the soil. Regular maintenance is essential to prevent failures, groundwater contamination, and costly repairs. In SC, the Department of Health and Environmental Control (DHEC) sets rules for design, installation, and pumping intervals. A well-sized tank and proper soil absorption are critical for long-term performance.

• What to expect:
  • Lifespan: 20-30 years with good care.
  • Pumping frequency: every 3-5 years for many households; more often for wells or grease-heavy usage.
  • Common issues: soggy drain field, foul odors, gurgling plumbing, backed-up toilets.

Sewer access in Chester County

Not every part of the county has access to municipal sewer. Where sewer lines exist, your home may connect via the local sewer district; outside those areas, septic is typically the only option. If a sewer extension reaches your street, you may face connection charges and recent assessments. Always confirm with your local utility and the county planning office on current plans and any hook-up deadlines.

Costs to consider

• Septic system costs:
  • Initial installation: highly variable by soil, tank size, and drain field design; typical range roughly $5,000–$25,000.
  • Ongoing maintenance: annual inspections and pumping as required; pumping every 3-5 years is common.
• Sewer connection costs:
  • Connection fees: can be substantial and depend on the district; upfront charges often range from a couple thousand dollars to over $5,000.
  • Monthly bills: sewer service charges vary by utility and usage; plan for ongoing costs in budgeting.
• Non-monetary considerations:
  • If your system fails, replacement costs can be high and may require permits and environmental safeguards.

Practical decision factors for homeowners

• Site suitability: soil type, slope, and groundwater influence septic performance.
• Home size and water usage: larger households or high water use stress septic systems more quickly.
• Proximity to wells or streams: increased risk if a failure occurs.
• Local sewer plans: any planned connections can shift long-term costs.

When to connect or replace

1. Check sewer availability with the county or your local municipality.
2. Obtain a formal cost estimate for tying into the sewer and compare with septic replacement costs.
3. If your current septic is failing or due for replacement, factor in disruption, permits, and soil requirements.
4. Review financing options and any county/state programs for septic repairs or sewer connections.

Maintenance and compliance

• Pump and inspect regularly; follow SC DHEC guidelines for pumping intervals.
• Protect the drain field: avoid heavy equipment, plant deep-rooted trees nearby, and keep water around the area to a minimum.
• Use water-saving fixtures to reduce load on your system.
• Don't flush nonbiodegradable items, solvents, or fats; dispose of them properly.

Official resources

• SC Department of Health and Environmental Control (DHEC): On-site Wastewater Systems.
• U.S. EPA: Septic Systems. https://www.epa.gov/septic
• Chester County, SC official site. https://www.chestercounty.org/