The paper describes some of the basic principles behind the DEPA Guidelines for discharge of industrial wastewater to public sewers set in operation in 1995 and evaluates some of the experiences with the implementation.

It is described how such guidelines support the approach of pollution prevention and the implementation of cleaner technology by putting a stress on the industry. Further an approach for the balance between environmental and technological considerations is introduced.

The need for easily understandable environmental priorities is stressed and a concept for this is presented along with its combination with available technology. Finally expression of the environmental requirements are discussed in relation to environmental and technological considerations.