Wastewater


Onsite Wastewater Treatment System (OWWTS):

  • If you cannot connect to the mains wastewater network, you will need an OWWTS.
  • This includes a percolation area for effluent disposal to the ground.

Compost Toilets:

  • Even with a compost toilet (dry toilet system), you need a method to handle greywater (dirty water from showers, machines, etc.).
  • Some local authorities do not consider a compost toilet adequate for dealing with wastewater, as it separates urine from solid waste and uses no flushing water.

Percolation Test:

  • A percolation test determines if the soil can absorb and clean water from your septic tank or treatment system.
  • In NI, discharge to a waterway is possible if the ground cannot filter effectively, provided the effluent is clean.
  • In the Republic of Ireland (ROI), discharging into a watercourse is nearly impossible; alternatives include drip systems and reed beds, which can be costly and may not be favored by all planning departments.

Maintenance and Grants:

  • All OWWTS require regular maintenance, including periodic desludging of the septic tank.
  • In ROI, existing septic tanks needing upgrades may qualify for a grant.
  • In NI, households are entitled to one free desludging per year.

Site Assessment:

  • A site assessor must evaluate your site and prepare a report to be submitted with your planning application.
  • In ROI, an independent site assessor is recommended to determine the appropriate system.
  • In NI, site assessment is typically conducted by a specialist supplier of onsite wastewater treatment systems.
  • Consider minimum distances between the OWWTS components and wells when designing the system.

Building Regulations:

  • Check your jurisdiction’s building regulations to determine which wastewater systems are suitable.
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Information on building your own home is for general purposes only and may not be accurate or up-to-date. Always consult with licensed professionals before making any decisions. We are not responsible for any errors or outcomes based on this content.

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