Sewage sludge is a mud-like residue resulting from urban wastewater treatment. It can contain contaminants such as heavy metals or pathogens. However, it also contains valuable organic matter and nutrients, and can therefore be very useful as a fertiliser or soil improver. To ensure the safe use of sewage sludge in agriculture and to prevent harming the environment and human health, the S.L. 549.09 – the Sludge (Use in Agriculture) Regulations
sets rules on how farmers can use sewage sludge as a fertiliser.

The Table below provides information on the quantity of sludge produced by the waste water treatment plants, quantity of sludge applied in agriculture (expressed as dry weight) and geographic location where the sludge was used.

YearQuantity of sludge produced by the waste water treatment plants (tonnes/year)Quantity of sludge applied in agriculture (tonnes)Geographic location identifying the places where the sludge is to be used *
20199,8740Not applicable
202011,5680Not applicable
202110,8980Not applicable
20229,4070Not applicable

* Until the present sewage sludge was never applied in agricultural fields in Malta.

Date July 2023.