Septic Tanks in Portugal in 2026: A Practical Guide to the 20-Metre Connection Rule, Sealed Tanks Versus Infiltration, Who Is Allowed to Empty Yours, and Fines up to 3,740 Euros
If the public sewer runs within 20 metres of your boundary, connection is compulsory and the fine for not connecting reaches 3,740 euros. If it does not, a sealed tank and one that infiltrates into the ground follow different rules, and the council decides who empties it.