Ireland regulates domestic wastewater treatment systems and provides national inspection arrangements to protect human health and the environment from septic tank risks.
Inspect original excerpt
Domestic waste water treatment systems (DWWTS) are used by householders to treat sewage. There are nearly half a million systems in Ireland, mostly septic tanks. DWWTS can contaminate household wells with harmful bacteria and viruses if not built and operated properly. Excessive releases of nutrients such as nitrogen and phosphorus can cause pollution in rivers, lakes and coastal waters.
First public verification: 2026-11-02 14:40