Why does the drain keep slowing down?
A repeat clog often has a cause beyond the buildup that was cleared, such as a low spot, a defect or roots.
Johnston, Iowa
Johnston grew in stages, and a drain that keeps slowing may sit on a line laid in any of them. A drain that slows again after cleaning needs a fresh look. Note how long the improvement lasted and whether one fixture or several are affected.
EPA sewer inspection guidance says inspection can identify where grease and debris accumulate or where roots intrude into a sewer. For a house line, that means finding the cause instead of repeating the same cleaning.
The city's own history runs from a sawmill in 1846 to the Interurban Railroad in 1907 to a 1969 incorporation. Homes added at each stage have lines from that stage. When a clog repeats, note the age of the house and ask what an inspection shows, since the cause is often not the last blockage.
A repeat clog often has a cause beyond the buildup that was cleared, such as a low spot, a defect or roots.
Often. One slow fixture can point to a short branch line. Several affected fixtures can point farther down the line.
Notes on when the problem started, which fixtures are affected and what earlier cleanings changed.
Yes, it helps frame the age of the housing. The inspection of your own line matters more.
Tell us about the affected drain, what you have noticed, and whether hydro jetting may suit the line.