Septic tank vs water treatment plant

Question

What's better for a home that's not connected to mains drainage - a septic tank or domestic sewage treatment plant?

Jason · Accepted Answer

If your waste drainage goes directly into a watercourse, because of recent legislation changes, you need to use an STP rather than a cess pit, unless you have room to fully drain your system in a drain field.  STPs are fundamentally better at producing clean waste water.  The downside is that they require continuous power for the air intake compressor and any discharge pumps you may need, so they have additional running costs of about £200 per year.  Also the compressor can be noisy.

James · Answer

Treatment plant is better over long term! Cost are more expensive to begin with but
You soon gain them back with less emptying of tanks and so fourth

Kris · Answer

Straight choice between the two I'd go for a treatment plant every time. It gives the option to discharge effluent directly to a watercourse where this isn't allowed with a septic tank. You have to discharge to a drainage field, if the ground conditions allow it, a percolation test is required to determine this. Check out the general binding rules, they tell you everything you need to know

John · Answer

Septic Tanks come in various sizes - 2720 Litres is the average size,  (2 bedroomed house) whilst 2900 L for a 3 bedroomed house. These days we use alot more water than before,  about 180 Litres a day, meaning soakaways on Septic tanks get Blocked more often,  Because of this Authorities now insist on sewage treatment plant system. as now now cost less than septic tank systems & there more environmentally Friendly/sustainable

Septic tank vs water treatment plant

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