This manual has been prepared to provide guidance on the design, operation and maintenance of on-site wastewater treatment systems for a single house. The National Standards Authority of Ireland published standard recommendations in 1975 (revised in 1991) with the aim of achieving satisfactory practice in the design, construction and maintenance of septic tank drainage systems. This manual has been prepared having regard to the above and will assist planning authorities, developers, system manufacturers, system designers, system installers, system operators to deal with the complexities of on-site systems. Where reference in the document is made to proprietary equipment, this is intended as indicating equipment type and is not to be interpreted as endorsing or excluding any particular manufacturer or system.
EPA Website: 2021 Code of Practice for Domestic Waste Water Treatment Systems