Residents in Telford who complained about a fishy smell coming from their drains have been told it was caused by dead piranhas, which had likely been flushed down the toilet.
Severn Trent Water says, when it investigated the sewers in Madeley, it also found a number of other dead fish.
It is not the first time sewers in Shropshire have been blocked by odd items - in January sewers in Ditton Priors, near Bridgnorth, were found to be blocked by piles of pants that had been flushed down the toilet.
Sue Fulford, customer operations manager for Severn Trent Water said: "The drains that take waste water away from your home are only a few inches wide and are only meant to take water, toilet roll and human waste.
"Toilet roll is meant to break down when it gets wet so it washes easily through the system."
Severn Trent have said the rain and storms over the last few days have led to an increase in calls form customers.
Extra staff are working at the firm's call centres and additional teams are being used on the ground to deal with flooding issues.
The company supplies water to more than four million households across the Midlands.
The water supply to thousands of homes across Birmingham is "slowly being restored" to normal following a major water mains burst, Severn Trent Water have said.
The firm has urged people to stay patient as it may still take time for the network to fill back up.
A spokesperson also warned people their water might be slightly yellow or orange - but said there was no imminent risk to health and it should return to normal if left running for a few minutes.
Supermarket shelves are being emptied of bottled water as homes in Birmingham have been left with little or no supply since this morning.
Thousands of homes in the city have been hit by supply issues after a water main burst earlier today.
Severn Trent Water has said it is moving water around the network and bringing in a fleet of tankers to try to restore water supply as soon as possible.
They hope to get 2,900 homes in Great Barr back up and running within a couple of hours, along with 1,500 homes in Northfield.
A further 2,700 houses in the Bartley Green and Woodgate areas and 600 in Selly Oak have also been affected.
Thousands of people across Birmingham are this afternoon without water after a "large water main" burst.
Almost 8,000 homes in Great Barr, Northfield, Selly Oak, Bartley Green and Woodgate are among those who have no water or low pressure.
A spokesperson for Severn Trent Water said engineers were now on site and trying to find a solution.
We’re really sorry and hope this isn't causing too much trouble.
We are doing all we can to restore supplies as quickly as possible.
Our incident team have identified some options to restore some supplies and are putting these plans into action.
A ranger has told of staff's excitement after a rare albino squirrel set up home at a Warwickshire waterway.
The ghost-white squirrel has been spotted at Draycote Water, near Rugby, in recent weeks - and the ranger has finally managed to capture it on camera.
A rare 'ghost' squirrel has made a Warwickshire waterway its new haunt.
Visitors to Draycote Water, near Rugby, have spotted flashes of white as the creature settles in to its new home less than two weeks before Halloween.
Until now, however, it has avoided being caught on camera.
Severn Trent Water ranger Thomas Crawford finally managed to snap the squirrel as it hunted for food.
The albino grey squirrel is one of just 50 thought to be alive in the UK.
A burst pipe at Severn Trent's Chaddesden reservoir left thousands of homes in the Chaddesden and Spondon areas of Derby without water.
Following a three-hour repair operation Severn Trent had repaired the burst by 8am.
Severn Trent Water say they have dealt with double the number of calls during the recent heavy downpours. Seventy percent of the calls turned out to be unnecessary. Watch Andy Bevan's full report.
Calls to a water company have doubled following the flash flooding across the region in recent weeks.
Bosses at Severn Trent Water said 70 per cent of the calls being made were for things the firm is not responsible for, like streams overflowing or drains being blocked.