sentences:  According to Bluewater Bio, an international firm specialised in wastewater treatment, out of 1,600 wastewater treatment plants in South Africa – not all of which were included in the Green Drop assessment – at least 60% are not meeting regulatory compliance requirements.According to a study by the South African Water Research Commission in partnership with the South African Local Government Association published in June 2013, 44% of wastewater treatment plants included in a representative sample used inappropriate and unnecessarily expensive technologies.There is a lack of funding for maintenance because of low tariffs, insufficient collection and the absence of ring-fencing of revenues for the purpose of maintaining assets, so that municipalities "run assets to failure".