Large Capacity Septic System Cost

The typical residential septic tank is 750 gallons in size. It can hold up to 1,250 Gallons. A septic tank, which is an enclosed unit that holds residential wastewater, is self-contained. The main components of the system are the tank and drain.

Engineered septic systems are more expensive because they have more moving parts and require special equipment. Mound systems will require additional installation of sand, and a pump tank. These factors add to the cost of installation, which can increase from $10,000 to $20,000.

A new septic tank system costs homeowners an average of $3,918, with most homeowners spending between $5,040 and $3,280 for a 1,250 gallon system that can support 3 or 4 bedrooms. On average, a new septic system that includes two alternating pumps will cost $9,571. Ask for free estimates from septic installers near your location.

On average, a new septic tank system will cost $3,918. Prices can range from $1,500 up to $5,000. A 1,250 gallon system with 3 or 4 bedrooms will cost homeowners between $3,280 to $5,040. Installation of a septic system with two alternating pumps can cost $9,571 and up to $15,000. The final cost will depend on the condition of the waste lines and soil where the tank will be placed. This system is the best choice for sewage treatment if you are building on unconnected land.

Regular maintenance of the septic tank and system must be done. There are many factors that will affect the frequency of septic service, including type of business, volume, commercial septic system, and size. For more information, business owners should contact their local county or state agency.

These materials can block the septic tank pipes and cause foul odor and sewage backup problems. They also increase the cost and time it takes to treat the wastewater in the city’s sewer system and at the treatment plant. FOG is an acronym for fats oils and grease. These substances can cause problems in both private systems and in public wastewater treatment plants located in larger cities.

Large Septic Systems include:

  • Grease traps in restaurants
  • Interceptors
  • Shopping centers
  • RVs & Motorhomes
  • Waste Water Recycling Plant
  • Pumping and retention repairs
  • Parking lot and pumping dry well
  • Hospitals

Price Details

Concrete tanks can be purchased for between $750 and $2,400, plastic for between $935 and $2,700, or fiberglass for between $1,575 to $3,200. Below are the itemized prices for each size, along with a list of all expenses.

  • 500 Gallon Tank Cost | $750 – $1,400
  • 750 Gallon Tank Cost |$1,000 – $1,800
  • 1,000 Gallon Tank Cost | $1,450 – $2,300
  • 1,250 Gallon Tank Cost | $1,735 – $2,600
  • 1,500 Gallon Tank Cost | $1,985 – $3,200
  • Percolation Test | $500 – $1,500
  • $1,250 – $2,500
  • $75 – $150 (May be optional)
  • $80 – $150
  • $2.00 – $3.25 per Linear Foot (Most systems require 40-75 feet)
  • $350 – $650
  • $500 – $800
  • Sand and Gravel (Most systems require 30 to 60 cubic yards of material)
  • $315 – $900 (Up to 1,500 gallon tanks)
  • $1,200 – $2,000

Types of Septic Systems Costs

  • Anaerobic/Gravity Systems – $6,700-8,500
  • Aerobic Treatment System – $7,400 – $11,300
  • Evapotranspiration System – $9,000 – $12,800
  • Sand Filter System – $7900 – $13,400
  • Engineered Mound System: $10,600 to $14,400

Mound Septic System Price

An above-ground mound system costs $15,000 and requires annual maintenance at $500. The percolation test may indicate that your soil doesn’t have the proper drainage qualities to support an underground septic tank. In this case, you will need to install an above ground septic tank at a cost of two to three times that.

A mound system engineered by engineers is necessary when soil conditions on the homeowner’s land are either too porous or completely impermeabile, or if only a thin layer of soil is present over porous rock, or a high annual water table.

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