Septic Tank Comparisons
Side-by-side comparisons for septic system types, tank materials, and connection options to help you make the right decision for your property.
Septic Tank vs Aerated Treatment System
Compare conventional septic tanks with aerated wastewater treatment systems (AWTS) for residential properties — upfront cost, ongoing maintenance, effluent quality, council requirements, and which system suits your site.
Conventional septic tanks cost $5,000–$15,000 to install and require pump-outs every 3–5 years at $250–$600. AWTS units cost $8,000–$20,000 to install but produce higher quality treated effluent suitable for surface irrigation and are required on smaller blocks, near waterways, or where conventional absorption trenches cannot be used. AWTS ongoing maintenance contracts ($200–$600/year) are mandated by most councils and add a significant lifetime cost.
Concrete vs Poly Septic Tanks
Compare concrete and polyethylene (poly) septic tanks for residential installations — cost, durability, installation ease, longevity, and which material is better suited to different soil conditions and site requirements.
Concrete tanks are heavier, require crane delivery, and cost $2,000–$6,000 to supply. They are extremely durable (40–60+ year lifespan), crack-resistant in stable soils, and are preferred in areas with expansive or reactive soils. Poly tanks are lighter, cheaper to supply ($1,500–$4,500), easier to install without heavy machinery, and resistant to corrosion from acidic soils. Both types carry long structural warranties and perform similarly in most conditions.
Septic System vs Sewer Connection
Compare maintaining an onsite septic system versus connecting to the mains sewer network — upfront cost, ongoing expenses, property value impact, environmental considerations, and when each option makes financial and practical sense.
Connecting to mains sewer costs $3,000–$12,000 (plus council connection fees of $1,000–$5,000) and eliminates ongoing pump-outs, inspection costs, and maintenance contracts. However, sewer connection is only possible where the council sewer network is within accessible distance. Where sewer connection is available and affordable, it almost always reduces long-term costs and property management complexity. Maintaining a septic system costs $250–$600 every 3–5 years for pump-outs plus periodic inspection and maintenance costs, with major component failures costing $1,500–$15,000+ to remediate.