An outbreak of insect larvae in Leicestershire's drinking water is being tackled by Severn Trent.
The worm-like creatures, about 4mm (0.16in) long, have been found at 10 homes in Evington, Oadby and Wigston and Loughborough, the water firm says.
Severn Trent is spending £150,000 to flush pipes in the affected areas.
The creatures - probably the larvae of freshwater midge known as chironomids - are not thought to be dangerous to human health.
David Wickens, quality and environmental manager at Severn Trent Water, said: "We are not sure how they are getting into the water, but they are found in reservoirs."
The chironomids are also found in rivers, where they are eaten by fish.
"We have started a flushing programme and are injecting compressed air into the mains."
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