Septic in Byrdstown, TN

If you've driven into Byrdstown and watched the lake glow at sunset, you've probably noticed how homes tucked along winding hillsides rely on practical, straight‑talk solutions to keep everyday life running smoothly. In our town, septic systems are a familiar, reliable part of life—just like a good neighbor who keeps your driveway clear in winter.

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

Yes. In Byrdstown and the surrounding countryside, most homes outside of municipal sewer lines use septic systems. If your property isn't connected to a city sewer, you should expect a septic tank and drain field to do the job. When you're buying, ask for the septic records, including the tank size, last pump date, and any recent repairs. Have the system inspected by a qualified pro before you close, so you know what kind of maintenance or replacement work might be needed down the road.

Why homes typically use septic systems in Byrdstown

• Rural layout and lot size: Many Byrdstown properties sit on sizable lots with homes spread out from wells and driveways, making centralized sewer service impractical.
• Age and development pattern: A lot of houses were built before sewer lines extended into every neighborhood, so septic became the sensible, affordable option.
• Groundwater and soil realities: The soil and groundwater conditions here often favor on‑site treatment when designed correctly, helping protect our wells and local water supply.
• Cost and practicality: Septic systems offer a practical, scalable solution for homes not tied to a city sewer main, providing reliable service with the right maintenance.

High-level explanation (why septic exists here)

A septic system is a simple, private wastewater solution: wastewater flows from the home into a tank where solids settle and liquids exit to a drain field. Bacteria break down waste in the tank, and the drain field disperses treated liquid into the soil. In Byrdstown, where centralized wastewater treatment isn't always nearby, this on‑site approach keeps homes comfortable, protects water sources, and avoids the cost of extending sewer lines through rural terrain.

Ways to care for a Byrdstown septic system

• Schedule regular pumping (typical every 3–5 years, depending on usage).
• Minimize water waste and spread out heavy loads (laundry and dishwashing) to reduce tank stress.
• Avoid flushing non‑biodegradables, grease, and chemicals that can disrupt the system.
• Keep the drain field free from heavy traffic and heavy structures; plant grass, not trees directly over the field.
• Have a qualified septic contractor inspect and service the system as needed.

If you're new to Byrdstown or planning a purchase, I'm right here to help you read the records, assess the system, and map out a smart maintenance plan—like a friendly neighbor who happens to be a licensed septic pro.

Where Septic Systems Are Common in Byrdstown

Why septic systems are common in Byrdstown

• Byrdstown and surrounding areas are largely rural, with many parcels not served by a centralized sewer line. On-site septic systems offer a practical, cost-effective wastewater solution for homes tucked onto larger lots.
• The landscape—hills, rock, and variable groundwater—often makes trenching for large sewer mains difficult and expensive, so septic keeps development flexible.
• Historical growth patterns mean many older homes were built before sewer expansion reached these outskirts. Today, septic remains the standard option for most of these properties.
• Local regulations require proper design, installation, and maintenance to protect groundwater and surface water, which helps prevent failures and environmental harm.

Where you'll typically find septic in Byrdstown

• Rural subdivisions and standalone homes along county roads away from town service areas.
• Homes sitting on larger lots (half an acre to several acres) where a drainfield needs space to meet setbacks from wells, property lines, and water features.
• Waterfront, hillside, and flood-prone sites near Dale Hollow Lake or streams where gravity-fed drainage is challenging and specialized systems may be needed.
• Older residences that were built before public sewer expansion and upgrades, still relying on individual septic tanks and drainfields.

Typical lot sizes and configurations in Byrdstown

• Lot sizes commonly range from about 0.5 to 2+ acres to accommodate a compliant drainfield and setback requirements.
• Conventional septic systems work on level to gently sloped sites; on steeper ground or shallow soils, there may be mound or bedded designs to achieve proper absorption.
• Split configurations or secondary drainfields may be used on irregular lots or where space is limited, but all designs must comply with local health and state guidelines.

Soil, terrain, and groundwater considerations in Byrdstown

• Soils in this region can be rocky or shallow, with limestone bedrock in places, which affects how well wastewater percolates. A soil test (perc test) guides drainage design.
• Slope and drainage influence drainfield layout. Steep properties may require alternative systems or distribution methods to prevent surface pooling.
• Groundwater proximity and seasonal water tables matter. In areas with high water tables or flood-prone zones, mound systems or alternative layouts may be necessary to protect the drainfield.
• Proximity to streams, wells, and the lake imposes setback requirements and design considerations. A qualified designer will map setbacks and choose a system type that fits the site.

Quick reference for Byrdstown homeowners

1. Confirm whether your property has municipal sewer access or if you'll use on-site septic.
2. Hire a licensed septic designer/contractor to assess the site and design an appropriate system.
3. Obtain a soil evaluation (perc test) and ensure the design meets local health department requirements.
4. Schedule regular maintenance: typical pump intervals are every 3–5 years, with inspections of tanks, pumps, and drainfields.

Official resources

• EPA: Onsite Wastewater Systems — https://www.epa.gov/septic
• Tennessee Department of Environment and Conservation (TDEC) — https://www.tn.gov/environment
• Pickett County Health Department (for local guidance and permitting specifics) — consult the county health office or their official site for local septic requirements and contacts

Septic vs Sewer: What Homeowners in Byrdstown Should Know

How a septic system works

• A septic system treats household wastewater on-site. Wastewater flows from your home into a buried septic tank where solids settle to the bottom and oils rise to the top.
• Liquid effluent exits the tank into a drainfield (soil bed) where natural processes further treat it before returning to the groundwater.
• Regular pumping and careful use of water help keep the tank from filling too quickly and protect the drainfield from damage.

How municipal sewer works

• In a centralized sewer model, your home connects to a city or county sewer line. Wastewater is transported to a treatment facility for processing.
• The utility is responsible for maintenance of mains, pumps, and the treatment plant; your ongoing role is mainly to avoid city backups and manage your own property accordingly.
• Sewer users typically pay a monthly or quarterly sewer bill, separate from water use.

Key differences at a glance

• Responsibility:
  • Septic: you own and maintain the system (tank, pipes, drainfield).
  • Sewer: the utility maintains the network and treatment facility; you maintain your interior plumbing.
• Maintenance needs:
  • Septic: regular pumping, drainfield protection, and water-use awareness.
  • Sewer: minimize improper discharges to prevent backups in the municipal system.
• Costs:
  • Septic: pumping (roughly every 3–5 years), potential repairs or replacement of tank/drainfield.
  • Sewer: ongoing sewer bill, occasional connection or upgrade fees if needed.
• Environmental risk:
  • Septic: a failing system can contaminate groundwater and nearby wells if not addressed.
  • Sewer: backups can impact streets, homes, and nearby water sources if the system is overwhelmed.

Byrdstown-specific considerations

• Rural areas around Byrdstown are commonly on on-site septic systems, while homes closer to municipal services may be connected to a sewer line. Confirm your setup with your property records or the local utility.
• How to tell which you have:
  • Check your water/sewer bill or your property tax notices for a sewer line charge.
  • Look for an underground tank and drainfield on your property, or ask your septic/plumbing professional to locate it.
  • Contact the Pickett County or Byrdstown utility office or your county assessor for exact connection details.
• If you're on septic:
  • Protect the drainfield area from heavy equipment, driving, and landscaping that compresses soil.
  • Avoid flushing or pouring grease, solvents, pesticides, or non-biodegradable items.
• If you're on sewer:
  • Be mindful of what you flush and pour down drains to prevent sewer blockages and backups into the home.

Maintenance you should do

• Pump your septic tank every 3–5 years (or as recommended by a local professional based on usage and tank size).
• Use water efficiently:
  • Spread out high-water activities (laundry, dishes) over the week.
  • Fix leaks promptly; install high-efficiency fixtures if possible.
• Protect the drainfield:
  • Keep plants with deep roots away from the area.
  • Do not compact the soil, drive over the drainfield, or park on it.
• Monitor for signs of trouble:
  • Gurgling sounds, slow drains, sewage odors, or wet areas above the drainfield require prompt attention.

What to do if you have a problem

• For septic:
  1. Limit water use to reduce load.
  2. Avoid harsh chemicals and enabling flush of solid wastes.
  3. Call a licensed septic contractor or a qualified plumber to assess and pump as needed.
• For sewer:
  1. Limit water use and avoid dumping grease or flushable wipes.
  2. Contact your local utility or a licensed plumber if backups occur.
• Do not attempt DIY repairs beyond basic maintenance; septic and sewer systems involve specialized equipment and safety considerations.

Resources and official guidance

• EPA on Septic Systems:

Typical Septic System Types in Byrdstown

Conventional gravity septic systems

• What it is: A standard setup with a septic tank and a soil absorption field (drain field) that relies on gravity to move effluent from the tank into perforated pipes buried in the soil.
• Ideal site: Moderate soil depth, good percolation, and adequate space for a drain field.
• Pros: Simple, cost-effective when soils are suitable; easy to maintain with regular pumping.
• Cons: Performance depends on soil conditions; may need larger lots for drain fields.
• Maintenance essentials: Schedule septic tank pumping every 3–5 years (or per local guidance); keep the right-use restrictions in place (no harsh chemicals, grease traps, or flood irrigation over the field).

Pressure distribution systems

• What it is: A conventional-style system that uses a pump and control unit to distribute effluent evenly across multiple trenches.
• Ideal site: Sloped lots or uneven soils where even distribution improves absorption.
• Pros: More uniform use of the drain field; can handle smaller individual trenches.
• Cons: Slightly higher upfront cost and power needs; components require maintenance.
• Maintenance essentials: Inspect and service pumps, control knobs, and filters; follow local inspection timing.

Mound systems

• What it is: An above-ground replacement for poor native soils, using a sand-filled mound over the natural ground to provide a suitable drain field.
• Ideal site: Shallow soil, high water table, or very poor drainage where a traditional drain field won't work.
• Pros: Expands buildable areas; effective in challenging soils.
• Cons: Higher installation and maintenance costs; requires more space and regular monitoring.
• Maintenance essentials: Keep cover vegetation healthy; avoid heavy traffic on the mound; monitor for surface dampness or odors and contact a pro if symptoms appear.

Aerobic Treatment Units (ATU)

• What it is: A compact, pretreatment unit that introduces air to improve treatment before disposal to a drain field. Often used when soils are marginal or space is limited.
• Ideal site: Areas with marginal soils or restricted space; where advanced treatment is beneficial.
• Pros: Higher effluent quality leaving the tank; can allow smaller drain fields.
• Cons: More complex technology; more ongoing maintenance and energy use; periodic service by a licensed technician.
• Maintenance essentials: Regular servicing by an authorized provider; replace components as recommended; monitor for alarms or unusual odors.

Sand filter systems

• What it is: An above-ground or shallow trench system that relies on a sand bed to filter treated effluent before it reaches the drain field.
• Ideal site: Lots with layered soils or where a traditional drain field is limited.
• Pros: Robust performance in problematic soils; can be a good retrofit option.
• Cons: Higher installation cost; requires maintenance of filter layers and media.
• Maintenance essentials: Periodic media inspection and replacement as needed; ensure access for maintenance is clear.

Chamber or deep-soil root chamber systems

• What it is: Modern drain-field alternatives using modular chambers instead of perforated pipes, sometimes with enhanced absorption.
• Ideal site: New builds and replacements where trench space is limited or soil conditions vary.
• Pros: Easier installation; may reduce labor time; flexible layouts.
• Cons: Not universal in all soils; needs professional design and installation.
• Maintenance essentials: Keep access points clear; avoid heavy loads on trenches; adhere to pumping and inspection schedules.

Quick decision steps for Byrdstown homeowners

1. Get soil and site testing done (percolation or soil boring) to understand absorption capacity.
2. Check local permitting requirements and setbacks with Pickett County Health Department or your local authority.
3. Compare system types against lot size, slope, water table, and future home plans.
4. Hire a licensed septic contractor experienced with Tennessee conditions.
5. Plan regular maintenance: pumping, inspection of tanks and effluent screens, and prompt attention to alarms or odors.
6. Official resources:
   • EPA: Septic systems overview and best practices: https://www.epa.gov/septic
7. Local guidance: Contact your county health department for site-specific regulations and inspection schedules.

Common Septic Issues in Byrdstown

Seasonal wet weather and high water table

• What it is: In Byrdstown, heavy spring rains and the seasonal rise in the water table can saturate the soil above the drainfield. This prevents effluent from percolating properly.
• Why Byrdstown-specific: Proximity to lakes and variable bedrock can yield soils that drain unevenly and stay wet longer after storms.
• Common symptoms: slow toilets, gurgling drains, puddling or wet spots on the drainfield, and mild odors near the system.
• What to do:
  1. Conserve water during wet periods (spread out laundry, delay long showers).
  2. Keep roof and surface water drainage away from the drainfield with properly directed downspouts and swales.
  3. Have the system evaluated if wet areas persist for more than a few days after rainfall.
• When to call a pro: Backup or surface sewage for more than 24 hours; persistent odors near the drainfield.
• Resources: EPA guidance on how septic systems work (

Poor soil conditions and shallow bedrock

• What it is: In parts of Byrdstown, the soil can be shallow to bedrock or have restricted drainage, limiting the absorption area for effluent.
• Why Byrdstown-specific: Karst-like features and variable soils can reduce the drainfield's effectiveness and lead to early saturation.
• Common symptoms: Frequent system cycling, surface effluent after rainfall, and odors near the field.
• What to do:
  1. Have a soil test and system evaluation done by a licensed professional.
  2. Consider alternative designs (such as mound systems or pressure-dosing fields) if approved by the local health authority.
  3. Increase drainage planning around the system (avoid compacting soil and avoid heavy equipment nearby).
• When to call a pro: If the soil test indicates limited absorption or if the system repeatedly fails after adjustments.
• Resources: EPA on-site system types (https://www.epa.gov/septic) and Tennessee environmental guidance (https://www.tn.gov/environment).

Overuse and improper waste disposal

• What it is: Excessive wastewater from multiple occupants, use of garbage disposals, and flushing non-biodegradable products overwhelm the tank and drainfield.
• Why Byrdstown-specific: Rural homes may have larger families or seasonal occupancy patterns that spike wastewater, plus local habits around flushable wipes or cleaners.
• Common symptoms: Frequent backups, strong odors, and new damp spots over the drainfield after heavy use.
• What to do:
  1. Install a septic-safe routine: only toilet paper, human waste, and approved cleaners go into the system.
  2. Avoid disposables in the system (wipes, sanitary products, coffee grounds, etc.).
  3. Space out high-water activities (laundry, dishwashing) to prevent overload.
• When to call a pro: Backups despite maintenance; odors or wet areas without obvious cause.
• Resources: EPA septic basics (https://www.epa.gov/septic) and UT Extension or local guidelines for best practices (https://extension.tennessee.edu).

Signs of a failing system and quick checks

• Observable indicators: toilets or sinks backing up, gurgling sounds, wet spots on the lawn, strong sewer odors near the tank or drainfield.
• Quick actions: reduce water use, avoid driving or heavy equipment over the drainfield, and contact a licensed septic professional for an inspection promptly.
• Documentation: note rainfall, irrigation schedules, and any changes in usage to help the technician pinpoint the issue.
• Resources: EPA septic maintenance overview (https://www.epa.gov/septic) and Tennessee environmental department pages for local regulations (https://www.tn.gov/environment).

Septic Inspection, Permits & Local Oversight

Local oversight in Byrdstown, TN

• In Byrdstown, septic system work is overseen by the Overton County Health Department under Tennessee state rules. They issue permits, conduct inspections, and keep records of system installations and repairs. The Tennessee Department of Environment & Conservation (TDEC) and the Tennessee Department of Health provide statewide guidance.

When a permit is required

• A permit is generally needed for:
  • New septic system installations
  • Replacements or substantial repairs
  • System modifications that change design or capacity
• Do not start any excavation or installation before you have an issued permit.

How the permitting process works (step by step)

• Step 1: Contact Overton County Health Department to confirm requirements and obtain the application.
• Step 2: If a design is required, hire a licensed onsite wastewater designer/installer. The proposed design may need health department approval.
• Step 3: Gather site data (soil evaluation/perc tests) and the proposed system design; submit with the permit application and fees.
• Step 4: Health department reviews the submission. They may request modifications or additional information.
• Step 5: Receive permit approval and schedule inspections with the health department.

Inspections you should expect

• Pre-construction site evaluation inspection.
• Inspections at critical milestones (trenching, pipe placement, backfilling, separation distances, tank placement).
• Final inspection when installation is complete and the system is ready to operate.
• A passing final inspection is typically required before the system is put into use.

Contractor and design considerations

• Use a state-licensed onsite wastewater professional for design and installation.
• Verify the contractor's license and credentials with the appropriate state board.
• Keep records of all inspections, permits, and design approvals for future reference or sales.

Codes, setbacks, and local requirements

• Be aware of local setbacks from wells, property lines, streams, and other water features.
• Check for any local zoning, land-use, or homeowner association rules that may affect septic placement or operation.
• Some Byrdstown neighborhoods may have additional requirements; always confirm with the county health department.

Resources to consult

• Tennessee Department of Environment & Conservation – Onsite Wastewater Program:
• EPA – Septic Systems:

Septic Maintenance for Homes in Byrdstown

Why Byrdstown soils and water patterns matter

• Pickett County soils can vary from restrictive, shallow layers to pockets of more permeable material. This drives drain-field design and maintenance needs. If your property sits near rocky terrain or heavy clay, your system may require closer attention and possibly alternatives like a mound or ATU (aerobic treatment unit).
• Byrdstown's climate and proximity to Dale Hollow Lake mean seasonal groundwater fluctuations and rainfall impact drain-field performance. In wet springs or after heavy rains, keeping up with maintenance helps prevent surface pooling, backups, and off-site runoff.

Regular inspections and pumping

• Frequency: Most standard residential systems in mixed-use homes are pumped every 3–5 years. Larger families, heavy water use, or homes with compacted soils or specialized components (like ATUs) may need more frequent checks. A licensed septic professional can tailor a schedule for your house.
• What to do during a visit:
  1. Locate and securely uncover the septic tank access lids.
  2. Have the tank pumped to remove accumulated sludge and scum.
  3. Have the tank and baffles checked for leaks or deterioration.
  4. Inspect the distribution box or pump chamber if your system uses one.
  5. Review any pretreatment units (filters, screens) and clean/repair as needed.
• DIY checks you can safely perform between visits:
  • Watch for slow drains, gurgling sounds, or sewage odors in the house.
  • Look for wet spots, lush growth, or strong odors in the yard near the drainfield.
  • Track water use: fix leaks promptly and run full loads only when necessary to reduce inflow.

Common Byrdstown-specific issues to watch

• Groundwater and seasonal flooding: After heavy rains or snowmelt, saturated soils can reduce drain-field absorption. Avoid driving or placing heavy objects on the drainfield during these periods; compaction slows percolation and can lead to backups.
• Proximity to surface water: Drain-field failures can increase the risk of effluent reaching streams or lakes. Protect water quality by adhering to maintenance schedules and properly disposing of household waste that could clog or harm the system.
• Soils with bedrock or shallow depths: If bedrock or shallow soils limit absorption, a drilled or mound system may be considered. Ensure permitting and design are handled by a licensed professional and vetted with the county health department.
• Seasonal occupancy: If your Byrdstown home is used seasonally, plan pumping and inspections around extended absences; long idle periods can mask emerging problems until you return.

Protecting your drainfield from everyday use

• Keep heavy equipment off the drainfield area. Parking vehicles or placing heavy loads on the drain field compacts soil and damages pipes.
• Plant carefully: Avoid trees with aggressive roots near the system. Groundcover and shallow-rooted grasses are best.
• Manage water wisely: Stagger laundry days, use high-efficiency appliances, and fix leaks quickly. Divert rainwater from roofs and hardscapes away from the drainfield.
• Smart disposal: Only toilet-paper and human waste should go into the toilet. Avoid flushing wipes, disposable diapers, paper towels, and grease or chemicals—these items clog or kill bacteria in the tank and can harm the system's biology.

Steps to take if you suspect a problem

1. Note symptoms: sewage odors, fast-receding drains, toilets backing up, or damp, soggy areas in the yard.
2. Limit water use and avoid additional stress on the system until evaluated.
3. Call a licensed septic contractor for an inspection and pumping if needed.
4. If a problem is found, request a full report and a recommended repair plan. Some issues require permits or involvement from the local health department.

Local and state resources

• EPA septic page:
• Pickett/Streets county health department information and guidance:

Cost Expectations for Septic Services in Byrdstown

Septic Tank Pumping

• What it includes: removing sludge and scum, inspecting tank baffles, ensuring lids are accessible, and transporting waste to a permitted facility. Some crews also clean effluent screens if present.
• Byrdstown-specific notes: dirt and clay soils here can lead to heavier sludge buildup and more frequent pumping for older systems.
• Typical cost in Byrdstown: $300–$600 for a standard 1,000–1,250 gallon tank; larger tanks or tougher access can run higher ($500–$700).
• Quick prep: locate the tank lids, remove cars or debris from drive/yard access to reduce excess charges.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Septic System Inspection

• What it includes: visual inspection of the tank and drain field, baffle condition check, lid access assessment, and basic health indicators. A full inspection may include dye tests or pumping if needed.
• Byrdstown-specific notes: inspections become especially important before buying property or after long dry seasons when soils crust up.
• Typical cost in Byrdstown: basic inspection $150–$250; full inspection with detailed reporting $250–$450.
• Quick tip: schedule with a licensed inspector who can flag drain-field issues early.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Drain Field Evaluation and Repair

• What it includes: soil and percolation assessment, trench or bed evaluation, diagnosis of failures, and targeted repairs (frame lines, distribution box, or lateral replacement).
• Byrdstown-specific notes: clay and rocky layers common in this area can complicate field performance; repairs may require heavier installation methods.
• Typical cost in Byrdstown: evaluation $150–$350; repairs $2,500–$8,000; complete drain-field replacement often $8,000–$25,000.
• Quick tip: long-term field health often hinges on proper grading and drainage around the system.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Septic Tank Installation (New System)

• What it includes: site assessment, permits, tank installation, distribution system, drain-field design, risers and lids, and basic system testing.
• Byrdstown-specific notes: local soil depth, bedrock proximity, and drainage influence whether a conventional system or mound/sand-filter is needed.
• Typical cost in Byrdstown: conventional system $5,000–$12,000; mound/alternative systems $12,000–$25,000+ (plus permit fees).
• Quick tip: get a design that accommodates future property use (e.g., additions or higher water use).
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Septic Tank Replacement

• What it includes: removing the old tank, upgrading components, and reconfiguring connections to a new tank and field as needed.
• Byrdstown-specific notes: if the drain field is still viable, replacement costs focus on tank and access; otherwise field replacement may be necessary.
• Typical cost in Byrdstown: $6,000–$15,000 (tank and basic field work); more complex field work or mound requirements push higher.
• Quick tip: consider upgrading to risers and lids for future pumping ease.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Sewer/House-to-Tank Line Cleaning

• What it includes: root cutting, hydro-jetting, and line inspection from the house to the tank.
• Byrdstown-specific notes: older residential lines can accumulate roots and mineral buildup; local tree coverage can escalate frequency.
• Typical cost in Byrdstown: $150–$350 for standard lines; more for severe blockages or camera inspection.
• Quick tip: address partial clogs promptly to prevent pump failures.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Cesspool Abatement or Conversion (If applicable)

• What it includes: decommissioning an old cesspool, backfilling, and converting to a standard drain-field system if feasible.
• Byrdstown-specific notes: many older homes in this area still have cesspools; conversion can be substantial but improves long-term reliability.
• Typical cost in Byrdstown: $2,000–$8,000 (conversion only; complete system upgrade may exceed).
• Quick tip: ensure proper permitting and final soil testing for the new system.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic

Emergency/After-Hours Service

• What it includes: rapid response to backups, overflows, or system failures outside normal business hours.
• Byrdstown-specific notes: weather and road conditions can affect response times in rural areas.
• Typical cost in Byrdstown: $150–$400 surcharge on top of standard service call.
• Quick tip: identify a trusted local provider for after-hours support.

Permitting and Planning Support

• What it includes: help with local permits, plan submittals, and compliance checks.
• Byrdstown-specific notes: permit requirements vary; neighbors' well setbacks and property lines can influence design.
• Typical cost in Byrdstown: often bundled with installation; standalone consulting may be $300–$1,000 depending on scope.
• Official resources: EPA Septic Systems - https://www.epa.gov/septic