Severn Trent is confident there will be no repeat of the larvae infestation which affected water supplies in Leicestershire over the last week. More than 150 customers complained about seeing tiny worms in their tap water. These were identified as midge larvae, which are not which harmful.
Quality and environmental manager David Wickens said he was confident the problem was under control.
He said new procedures should stop the problem coming back.
Repeated tests
He said: "We have got a programme that by allowing our carbon filters to stand and allow the oxygen to drain out of them, that will prevent any midges, or midge larvae, getting through."
Mr Wickens said the process will be repeated regularly to deal with the problem, which affected thousands of homes in the county last week.
It was thought the chironimids - or midge eggs - got into water supplied from the Staunton Harold reservoir.
The water company said there was no risk to human health.
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