Septic Tank System Cost
A Comprehensive Price Guide
The average septic tank system cost can range from $10,000 to $20,000. Factors like tank size, material, and system type influence these costs. This guide will help you understand the pricing details to make an informed choice.
Key Takeaway Points
- Septic tank installation costs can range from $7,000 to $20,000, influenced by system type, tank size, materials, effluent dispersal options and local regulations.
- Regular maintenance for septic systems typically costs between $500 and $1,000 annually, including pumping and inspections, with potential for significant repair expenses if neglected.
Homeowners can choose between professional and DIY septic installations, with professionals ensuring compliance and efficiency, while DIY can offer cost savings but poses risks.
Understanding Septic Tank System Costs
Understanding septic tank cost helps in making informed installation decisions. Prices generally range from $7,000 to $12,000 for basic systems, and up to $20,000 or more for complex ones. Several factors influence these costs, including tank size, materials, and system type.
Tank size significantly affects overall cost. Larger tanks usually cost more but offer economies of scale, reducing the cost per litre of wastewater. The material also impacts price, with options like plastic, fiberglass, concrete, and steel, each having different cost implications.
Different septic systems, such as aerobic or sand filter systems, have variable installation and maintenance costs. Aerobic systems, for example, are more expensive due to advanced installation requirements. Knowing these factors aids in choosing the right system for your needs.
Size of the Septic Tank
In Australia, the size of a septic tank required for a residential property typically depends on several factors, including the number of bedrooms in the house, the number of occupants, and local regulations.
As a general guideline:
- A 1-3 bedroom house requires a minimum of 3,200 litre septic tank.
- For a 4 bedroom house a 4,500 litre septic tank is typically needed.
- And for a 5 or more bedroom house a minimum of a 6,000 litre tank may be necessary.
These sizes can vary depending on the specific requirements set by local councils and environmental authorities. It’s essential to consult with a professional installer or local council to ensure compliance with local regulations and to determine the appropriate size for your specific situation.
Materials can determine the Septic Tank System Cost
Septic tanks are made from various materials, each affecting the cost. Common materials include concrete, a plastic septic tank, steel, and fiberglass. Plastic septic tanks, made from polyethylene, are affordable, ranging from $500 to $1,500, easy to install, lightweight, and rust-resistant. Additionally, understanding the different septic tank materials can help in making an informed choice.
Concrete tanks are durable but heavier and may need reinforcement, increasing installation costs. Fiberglass tanks, made from fiber-reinforced plastics (FRP), are more durable than plastic but might require anchoring to prevent floating. Steel tanks are less recommended due to high costs and susceptibility to rust.
Type of Septic System
There are several types of septic systems used for the treatment and disposal of wastewater in areas without access to a centralised sewage system. The choice of system depends on factors like soil type, site conditions, local regulations, and household size. Different septic systems involve varying materials and installation processes, affecting overall costs.
Here are the common types:
1. Conventional Septic Tank and Drainfield Systems
- Septic Tank: A watertight tank where solids settle and scum floats. The effluent is then discharged to a drainfield.
- Drainfield (Leach Field or Absorption Field): A series of trenches filled with gravel or sand where the effluent is further treated as it percolates into the soil.
2. Aerated Wastewater Treatment Systems (AWTS)
- Aeration: These systems use mechanical aeration to promote the growth of aerobic bacteria that break down organic matter more efficiently than anaerobic bacteria.
- Treatment Chambers: Typically, an AWTS has multiple chambers for sedimentation, aeration, and disinfection (often with chlorine or UV light).
- Irrigation or Subsurface Disposal: Treated effluent is usually suitable for irrigation or other forms of subsurface disposal.
3. Worm Farm Waste System
Over 3500 systems have been installed in Australia.
- Single Chamber: Operates 20 times faster than traditional septic or aerated systems in processing sewage solids, wastewater and organic waste. Pumps are very quiet and are only activated by demand.
- Treatment Chambers: Single chamber with low site impact. Its a aerobic system with a wind driven vent to super charge your septic tank.
- Irrigation or Subsurface Disposal: Natural liquid fertiliser is added into your soil, opening up clay soils 100mm vertically per year.
- Benefits: Low running costs. $20 per year based on a 4 bedroom house. No smells and is fully environmentally friendly and sustainable.
4. Sand Filter Systems
- Sand Filter: These systems use a bed of sand to filter and treat effluent from the septic tank. Effluent passes through the sand, where it is treated by physical filtration and microbial action.
- Drainfield: The treated effluent is then discharged to a drainfield.
5. Mound Systems
- Mound: Used in areas with shallow soil or high water tables. A mound of sand and gravel is constructed above ground to provide additional filtration before effluent enters the natural soil.
- Distribution System: Effluent is pumped into the mound and percolates through it before entering the soil.
6. Composting Toilets
- Composting Chamber: These toilets collect human waste in a chamber where it decomposes through aerobic processes. The resulting compost can sometimes be used as a soil conditioner.
- Minimal Water Use: They are waterless or use very little water.
7. Wetland Systems
- Constructed Wetlands: Use specially designed beds planted with wetland vegetation. The plants and soil microorganisms help treat the effluent.
- Subsurface Flow: Effluent flows through the root zone of the plants, where it is treated before being discharged.
8. Greywater Systems
- Greywater: Systems that specifically treat water from showers, sinks, and washing machines, separating it from blackwater (toilet waste).
- Treatment and Reuse: Treated greywater can often be reused for irrigation or toilet flushing.
8. Evapotranspiration Systems
- Evapotranspiration Beds: Use shallow beds filled with gravel and lined with an impermeable barrier. Water evaporates or is taken up by plants.
- No Groundwater Discharge: These systems do not discharge into groundwater, making them suitable for areas with poor soil permeability.
Each system type has its advantages and limitations, and the choice depends on site-specific factors and local regulatory requirements.
Septic Tank System Installation Costs
Septic tank system cost varies widely, from $800 to $2,000 for standard models. In Australia, overall installation costs generally range from $7,000 to $20,000, depending on factors like system type and location. These costs include labor, local regulations, topography, and design considerations.
Complexity, location, and soil conditions influence installation costs. These costs also cover setting up, creating, and implementing an absorption trench system. Approval to operate a sewage management system is required before installation begins.
Consulting local contractors can offer valuable insights into installation costs and requirements. Consider labor, permits, and site preparation when budgeting for a septic tank installation.
Labour Costs
Labor costs significantly impact the budget for septic tank installation. Factors like geographical location, tank size, and soil conditions affect these costs. For example, if the tank is closer to the house, labor costs might be lower, while greater distances can increase them
Installing a septic tank typically takes about four to five days. DIY installations may require significant time and labor from the homeowner, which could offset some savings.
Permits and Regulations
Approval from local councils is needed before installing a septic tank system. For example, in Victoria, council approval is required via a septic tank permit. The system must meet local standards and council requirements, covering aspects like land size, number of bedrooms, the geo-technical engineers report (LCA) and environmental of conditions.
Professional installers usually handle local council regulations and permits, minimising delays and ensuring compliance. DIY installations might result in hidden costs like equipment rentals and potential fines for non-compliance.
Site Preparation
Proper site preparation is essential for successful septic system installation. Key factors include site suitability for effluent absorption, the number of residents, available land area, and heavy water-use appliances. Adequate permeable soil and distance from water tables are important considerations.
Soil conditions and site suitability significantly affect installation cost and efficiency. Proper preparation ensures the septic system’s longevity and effectiveness.
Maintenance and Operational Costs
Regular Maintenance, Repairs and Replacement
1. Regular Pumping and Cleaning
- Frequency: Most septic tanks need to be pumped out every 3 to 5 years, but this can vary based on usage and tank size.
- Cost: Pumping out a septic tank generally costs between $300 and $800 per service. If the tank needs to be pumped every three years, the annualised cost would be approximately $320.
2. Routine Inspections
Regular professional maintenance is necessary to avoid clogs and problems. A professional should handle septic tank cleaning as part of a septic tank maintenance schedule. Minimising oils, fats, or food scraps helps maintain functionality.
However, a Worm Farm Waste System will easily handle organic waste on site and turn it into a reusable liquid fertiliser that is distributed underground throughout your property.
3. Service Contracts for Advanced Systems (e.g. Aerated Wastewater Treatment Systems)
- Frequency: These systems often require more frequent inspections and maintenance, typically every 3 to 6 months.
- Cost: Service contracts for AWTS or other advanced systems can range from $200 to $500 per year, depending on the complexity of the system and the service provider.
- No Contracts: The Worm Farm Waste System does not require a service contract.
4. Repairs and Replacements
- Minor Repairs: Minor repairs, such as replacing a pump or fixing a pipe, can cost anywhere from $100 to $500.
- Major Repairs: Major repairs like the effluent disposal area or system replacements can be much more expensive, potentially costing thousands of dollars.
5. Additives and Chemicals
Some homeowners use additives or chemicals to enhance the bacterial activity in the tank. These products are generally not necessary and can cost around $20 to $50 annually.
6. Effluent Disposal Area Maintenance
Cost: Maintenance of the effluent disposal area (like clearing vegetation, repairing trenches, etc.) can add to the costs but is typically not an annual expense unless specific issues arise.
Estimated Annual Cost Range
For a typical conventional septic tank system, the annual maintenance costs, including regular pumping and inspections, might range from AUD 200 to AUD 400. For more advanced systems like AWTS, the annual costs could be higher, typically ranging from AUD 400 to AUD 700 or more, depending on the level of service and frequency of maintenance required.
These are general estimates, and actual costs can vary. It’s advisable to consult with local service providers for more specific information based on your location and system type
Efficiency and Energy Use
Annual power costs for septic tanks average around $300. Non-gravity-fed systems typically incur electricity costs ranging from $30 to $40 annually. Systems like the Worm Farm Waste System can treat wastewater to high standards without using electricity or chemicals.
AWTS systems efficiently disinfect effluent for safe irrigation and other uses. Sand filter systems generally require minimal or no power, reducing operational costs.
Cost Comparison
DIY vs Professional Installation
Homeowners face challenges when choosing between professional and DIY septic tank installations, as both options have distinct costs and benefits. Professional installations ensure the job is done correctly, minimizing future risks, while DIY installations can lower upfront costs.
Advantages of Professional Installation
Hiring professionals ensures correct installation, minimizing future issues. Professionals complete installations more quickly than DIY efforts, reducing property disruption. They also have the experience and tools necessary to avoid costly mistakes.
Potential Savings with DIY
Choosing a DIY septic tank installation can significantly lower labor costs, potentially saving thousands of dollars. DIY installation allows homeowners to control the project timeline, potentially leading to faster completion.
However, it’s essential to weigh these savings against the risks and potential hidden costs.
Choosing the Right Septic Tank Installer
Choosing the right septic tank installer is key to a successful installation. Gathering recommendations from friends and family can help find reliable services. Research installers, request quotes, and check credentials.
Researching Installers
Researching installers is essential for a successful installation. Assess the company’s reputation and reviews through online platforms before selecting an installer. Customer feedback helps gauge performance and reliability.
Thoroughly researching potential installers helps avoid common pitfalls and select a company with a proven track record of quality work and customer satisfaction. This step is vital for ensuring correct and efficient installation.
Requesting Quotes
Requesting and comparing quotes from multiple installers ensures a fair price for septic tank installation. Verify that the installer is licensed and insured to ensure compliance and protect against liabilities.
When comparing quotes, consider not only the price but also the quality of service, warranty provisions, and the installer’s reputation. This comprehensive approach will help you make an informed decision.
Checking Credentials
Choosing an installer with significant industry experience, such as those with over 10 years in the sewage treatment industry, provides added assurance. Knowing the types of septic tanks the installer handles can influence your decision.
Verifying the credentials of your septic tank installer is crucial to ensure they are qualified and trustworthy. Seek reliable reviews or testimonials to gauge the quality of an installer’s work before making your selection.
Summary
Understanding the costs associated with septic tank systems is essential for making informed decisions. Factors such as the size, material, and type of system, as well as installation, maintenance, and operational costs, all play a role in the overall expenditure. By considering these elements, homeowners can ensure they choose a system that meets their needs and budget.
Choosing the right installer and weighing up the benefits of professional versus DIY installation are also critical steps in the process. With the right information and careful planning, installing a septic tank system can be a manageable and cost-effective solution for wastewater management.
Frequently Asked Questions
How much does a septic tank system typically cost?
A septic tank system typically costs between $10,000 and $12,000 for a basic installation, while more complex systems may range from $15,000 to $20,000 or more.
What factors influence the cost of installing a septic tank?
The cost of installing a septic tank is influenced by factors such as the system’s size and material, the type of system chosen, labor costs, necessary permits, and the site preparation involved. Understanding these elements can help you estimate the overall investment required.
What is the average cost to pump out a septic tank?
The average cost to pump out a septic tank in Australia typically ranges from $200 to $800, depending on various factors. These factors include:
- Tank Size: Larger tanks will generally cost more to pump out because they require more time and labor.
- Location: Costs may vary based on the location and accessibility of the property. Rural or remote areas may incur additional travel charges.
- Frequency of Service: If the tank hasn’t been pumped out in a long time and requires more extensive cleaning, the cost may be higher.
- Local Regulations: Some areas may have additional fees or specific requirements that can affect the cost.
What are the advantages of hiring a professional installer for a septic tank system?
Hiring a professional installer for a septic tank system guarantees proper installation, minimises costly errors, and ensures compliance with local regulations. This not only protects your investment but also contributes to the longevity and efficiency of the system.