Routine testing was introduced as a result of concerns that macerated waste contained within the dump could leach into the river.
The Cloghole abstraction point just downsteam of Mobuoy supplies Derry with 60 per cent of its drinking water.
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Mr Poots said: “My focus is to ensure that we provide safety when it comes to drinking water in the River Faughan. Testing is carried out weekly to ensure that the water quality remains good, and it does.
“We are looking at developing a course of work that will ensure that the waste material that is there is made safe for generations to come.”