SAUGUS – A drop off center may have solved the town’s illegal dumping problem when it comes to TV’s and computer monitors but now it has a new one-grease.Town Manager Andrew Bisignani told the Board of Selectmen Tuesday that grease is somehow finding its way into the town’s sewer system and is causing some major problems. He is asking the public to take notice.”If you see any activity around a manhole, or any place that looks suspicious please take note,” he said.Write down a license number, the vehicle type and call the police, he asked.With the cold weather settling in Bisignani said the grease hardens in the pipes like concrete, which results in big problems with the pumping stations. He said in some cases the grease has also caused sewer backup in residents’ homes.Last spring Bisignani said a large block of grease was removed from pipes running along Forest and Main streets.”And this fall we were back there again,” he said.What is even more frustrating for Bisignani, however, is the Department of Public Works cannot figure out where the grease is coming from. Selectman Michael Kelleher said the town has previously gotten lucky tracking the dumping by snaking a camera down the line.”I know there has been problems in the past and sometimes, by examining the lines, you find there is only one business operating on the line,” he explained. “Previous town managers have caught businesses that way.”Selectman Stephen Horlick said it sounds to him like a grease removal company is taking the easy way out.Horlick said restaurants often hire a service to pump out their grease traps and he wondered if one is choosing to unload the grease in the town’s system rather than dispose of it properly.Bisignani said he has contracted with an inspector to inspect every grease trap in town and keep detailed records of when the traps are cleaned. He said he is hoping if there is a connection between the cleanings and the dumping he’ll be able to make his case through the inspector.Kelleher pointed out that establishments with grease traps are supposed to supply those records to the town. Wendy Reed, clerk to the selectmen, agreed. She said it is up to the businesses to supply a maintenance log to the Board of Health and the Plumbing Inspector.Kelleher said he also suspected that workers who simply didn’t know better were probably doing much of the dumping.”I bet 80 percent of it is innocent disposal by people that didn’t know they were causing a problem,” he said.The remaining 20 percent he said could be more nefarious.Horlick said he simply hoped that if the illegal dumpers were caught they be prosecuted to the fullest extent of the law.