More than a quarter of septic tanks inspected last year were found to be a risk to human health or the environment.
Councils across the country tested 1,160 systems in 2019 – and 51% failed.
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In Clare, 41 inspections were carried out last year, and 59% of those tanks failed to meet minimum standards.
Senior EPA Inspector Noel Byrne joined Gavin on Wednesday’s Morning Focus to discuss their findings.