Flytippers dumping tyres and even dead animals on Fenland waterways is costing the tax payer £75,000 a year.
Staff at the Middle Level Drainage Board are seeing more and more incidents and warn this could have an impact on the area’s vital flood defences.
The warning comes after a load of tyres are filling a dyke in Barker’s Lane, March, after being dumped last week.
Operations engineer Jonathan Fenn said: “Sooner or later this is going to cause a real issue with flooding. We are all squeezed with budgets and trying to do more for less.
“We are taking money away from important flood defence work by having to clear ditches.
“Flytipping is costing a lot of money.”
Tyres left on their rims and covered in some form of lubricant are being dumped in Fenland waterways.
Workers for the drainage board have to clear the tyres, which are then disposed of by Fenland District Council.
Mr Fenn said: “Tyres if left on their rims float down the water course and get stuck in pipes and pumping stations. The impact of that could be flooding.”
The bodies of sheep, pigs and horses are also being dumped on the river bank.
People in Upwell were horrified last week to discover the body of a black and white cob foal on the river bank. A rope was left around its legs where it had been dragged.
The district council has recorded just over 1,000 incidents of flytipping between March 2014 and February 2015.
The council spends about £75,000 a year on clearing flytipping.
A council spokesman said: “Cleaning up rubbish dumped by flytippers on public land costs local taxpayers a lot of money that could otherwise go towards other services that benefit the community.”