We are investigating whether to redig our drainfield for our septic tank or buy a new Septic Sewage treatment plant (before the £100,000 fines from the new General Binding Rules come in on Hanuary 1st 2020)

https://inspectapedia.com/septic/Sep...field_Life.php

The old drainfield has blocked over time, as they do,
but the water table has risen due to the farmer's father (RIP) blocking the watercourse lower down for a new field entrance.

I'm guessing that a higher water table will mean less drainage from the drainfield and a much shorter life for it. Plus as seven properties share it we cant be sure people arent pouring fat etcetera down it.

Do we spend time and money digging holes for percolation tests, or decommission the septic tank and get a new sewage treatment plant?

Could we force the farmer to dig out the watercourse and bury a pipe to drain it as it was originally?

A hundred variable here, any advice and experience please?

George