Firms discharging to sewer will be affected by toxicity assessments

Yorkshire Water is pleading for companies to "get involved" in a demonstration programme on toxicity assessment, which may affect up to 2,500 firms discharging directly or indirectly to the river Aire - particularly waste, chemicals and textiles businesses. The work is part of a national demonstration on direct toxicity assessment (DTA) of effluents.

In 1996, the Environment Agency proposed that toxicity limits in discharge consents could be used in regulating chemically complex effluents. The idea got a stormy response from industry (ENDS Report 262, pp 19-21 ).

Industry bodies argued that the proposals would be too costly and a recipe for protracted leg

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