Question to the Department for Environment, Food and Rural Affairs:

To ask the Secretary of State for Environment, Food and Rural Affairs, what assessment he has made of the effectiveness of wastewater treatment networks in filtering out microplastics.

Government recently funded an external rapid evidence assessment to better understand the costs, benefits, and efficiencies of installing filters in washing machines. The filters aim to trap textile microplastic fibres during the laundry cycle and before discharge to sewer networks and wastewater treatment works. The assessment concluded further evidence was needed to determine how to avert additional costs incurred by consumers of new washing machines with filters, and the consumer’s sustainable disposal of used filters.

A water industry investigation of the levels and types of microplastics entering a range of UK wastewater treatment works reported that conventional treatment can remove 99% of microplastics by number and 99.5% by mass.