Biodisc, Septic tanks and soakaways
A new installation requires planning permission.
Planning permission is not required for the installation of a replacement waste water treatment system (sewerage treatment facility) within the curtilage of a dwelling house provided
(1) No part of the development may be constructed within 9 metres (measured at ground level) of the route of any overhead electrical line carrying 11kv or more (High Tension power cable);
(2) No part of the development may be constructed within 9.1 metres of the bank of any designated watercourse under the Flood Risk Management Act 2013 (FRM);
Also included from Schedule 4 of the Order
(2A) The operations specified must not be constructed (including any foundations) so as to involve the felling, lopping or limbing of any tree (other than a tree referred to in section 3(3) of the Tree Preservation Act 1993).
(2AB) The following Schedule 1 operations must not be situated closer to a tree (other than referred to in section 3(3) of the Tree Preservation Act 1993) than the required distance (d) Class 19 Replacement of waste water treatment systems;
(2B) for the purpose of paragraph (2AB) the “required distance” is
(a) for a tree with a single stem, 12 times the tree’s stem diameter; or
(b) for a tree with more than one stem, 12 times — (stem diameter 1)2 + (stem diameter 2)2 … + (stem diameter 5)2, where the stem diameter is measured 1.5 metres above ground level.