How much does a new septic system cost?

Written by jay leone
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Purchasing a new septic system can be a costly endeavour regardless of which type will be installed. Initial purchase and installation costs are heavily dependent on region.

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According to, installing or replacing a conventional septic system costs anywhere from £1,300 to £7,800.


In the Midwest, a conventional septic system installation averages £1,300 to £3,250. In areas of the country where material and labour are more expensive, like on the West Coast and in most of New England, it costs between £2,600 and £7,800.

Alternative Systems

According to the Rhode Island Water Quality Program, more advanced septic systems that utilise mounds, aerobic systems, sand filters or constructed wetlands cost consumers £6,500 to £13,000 to have professionally installed.


The septic tank itself can be quite costly. According to, tanks with capacities ranging from 300 to 1,000 gallons cost between £325 and £1,170.

Other Costs

Obtaining a building permit to install a septic system can cost anywhere between £65 and £650, depending on the region and complexity of the installation project.

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