(28)Urban wastewater treatment plants also receive non-domestic wastewater, including industrial wastewater, which can contain a range of pollutants not explicitly covered by Directive 91/271/EEC, such as heavy metals, microplastics, micropollutants and other chemicals, including per- and polyfluoroalkyl substances (PFAS). Such non-domestic wastewater may come, for example, from industries, commercial establishments, or hospitals and other medical facilities. In most instances, there is a poor understanding and poor knowledge of such pollution, which can lead to a deterioration in the functioning of the treatment process and contribute to the pollution of the receiving waters, while also preventing the recovery of sludge and the reuse of treated wastewater. Member States should therefore regularly monitor and report on such non-domestic pollution that enters urban wastewater treatment plants and is discharged into water bodies. To prevent pollution from non-domestic wastewater discharges at source, releases from industries or enterprises connected to collecting systems should be subject to prior regulations or specific authorisation, or both, by the competent authority or appropriate body. In order to ensure that collecting systems and urban wastewater treatment plants are technically capable of receiving and treating the incoming pollution, the operators who manage urban wastewater treatment plants receiving non-domestic wastewater should be consulted and informed before those authorisations are issued or those prior regulations are adopted, and should be able to consult, on request, the issued authorisations in order to be able to adapt their treatment processes. Where non-domestic pollution is identified in the incoming waters, Member States should take appropriate measures to reduce pollution at source, by enhancing the monitoring of pollutants in collecting systems so that the pollution sources can be identified and, where necessary, by reviewing the authorisations provided to relevant, connected urban wastewater treatment plants.