RAW sewage was left near Louth homes for two days before being cleaned up by Anglian Water, angry residents have claimed.
The leak happened during the recent heavy rain when a manhole cover came up in the Keddington Lane area.
The leak was close to the Anglian Water treatment works in Louth, but despite this, it took the company two days for it to be satisfactorily cleaned.
A resident living in the area had raw sewage and other waste matters including tissues and sanitary items in her garden.
She has been forced to complain to Anglian Water before and the latest incident was the third time it has happened in 12 months.
Frustrated it happened again, she contacted her ward councillor Terry Knowles, who helped to put pressure on the water authority.
The resident said a clean-up was done on Wednesday, the following day, but there were still tissues, sewage and other waste items in her garden and on the road.
She said: "I was told they would send another team on Thursday morning but they did not arrive until Thursday afternoon. I feel they only did it adequately this time because East Lindsey's environmental health team were there at the same time, thanks to Councillor Knowles.
"I feel the clean up happened too late. On the two previous occasions, they said there was no health risk but my dog was seriously poorly last time.
"They should have been out to clear it up as soon as it flooded.
"We've been here 12 years without an issue and now it has happed three times in 12 months. This is the main sewer from Louth and surrounding villages, there is obviously a fault but I feel Anglian Water are cutting back on maintenance costs and that is why the equipment has not been mended. They have admitted to me it is faulty."
Antony Innes from Anglian Water said: "We are sorry that the initial clean-up of a sewage spill near to our Keddington Lane treatment works was not to our usual high standards. We have now revisited the area and completed a thorough clean up making sure that the affected customer and the environmental health office are satisfied.
"A number of storm screens at the treatment works became blocked following the heavy rainfall on Tuesday night; these screens have now been cleaned and repaired.
"Regrettably, similar problems have happened recently which is why we are investigating options to further improve how they operate in storm conditions, and help to prevent similar spills happening in future."
Anneliese Johnson, environmental team leader at East Lindsey District Council, said the council was investigating the causes of what appeared to be a recurring problem.
She said: "Anglian Water has given assurances that they will make sure once the issue is identified that this does not reoccur."