How To Clear Main Sewer Line |work| Jun 2026

If you have any doubts, especially with older cast iron or clay pipes, a single mistake can crack the line and turn a $300 job into a $5,000 excavation. When in doubt, call the pro.

Never pour massive amounts of liquid caustic soda or sulfuric acid down a main line. They generate extreme heat that can melt PVC pipes, corrode cast iron, and severely injure plumbers if a professional must intervene later. how to clear main sewer line

| Step | Action | |------|--------| | 1 | Verify multiple fixtures are backing up | | 2 | Locate and open main cleanout (carefully) | | 3 | Rent appropriate electric auger (5/8”+ cable, 75ft+ length) | | 4 | Feed cable toward street until clog breaks | | 5 | Retract, flush, test flow | | 6 | Camera inspect to find cause | | 7 | Implement prevention (roots/grease) | If you have any doubts, especially with older

Working on a main sewer line involves heavy equipment, raw sewage, and potentially dangerous tools (like motorized augers). If you are unsure at any step, call a professional plumber. In many areas, the homeowner is responsible for the line from the house to the street (or property line), but the municipality owns the main under the street. Know your responsibility. They generate extreme heat that can melt PVC

The main cleanout is a horizontal pipe with a large removable cap (often square or raised nut). Look for:

Run plenty of water from a garden hose down the cleanout to wash the shredded remnants out to the municipal sewer.