Just to note that the position of the tank is also critical in terms of minimum distance from the house.
This page seems to contain the current links -
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Figure 13 shown on P.37 in the link below refers -
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See also Table 4 on P. 19 of the above link
Septic Tank - minimum separation distances in metres from -
10M - Watercourse/stream
10M - Wells, Springs
50M - Lake
7M - Any Dwelling
3M - Site Boundary
4M - Road
4M Slope breaks/cuts
For PERCOLATION AREAS the distances are as follows (difference noted in bold) -
10M - Watercourse/stream
30M - Wells, Springs
50M - Lake
10M - Any Dwelling
3M - Site Boundary
4M - Road
4M Slope breaks/cuts
Re the sections on Wells/Spings above, the following is noted -
* This applies to wells down-gradient or where flow direction is unknown. For more information on wells alongside or up-gradient consult DELG/EPA/GSI ground water protection scheme - see note 1.
Note - 1 Department of Environment and Local Government, Environmental Protection Agency, Geological Survey of Ireland 2000. Groundwater Protection Responses for On-site Systems for Single Houses.
So it would appear that septic tanks are location sensitive, if perhaps not quite so much as percolation areas.
The information posted here rely on other sources, the status of which cannot be confirmed.
Always check with the local authority regarding current requirements.
ONQ
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.