Main Sewer Line Clog Causes

Common Main Drain Problems and Solutions

  1. Drain sluggish or backed up
  2. Two or more drains backed up
  3. Odors or gurgling from drains
  4. Basement floor drain backed up
  5. All drains sluggish or backed up

Drain sluggish or backed up

Possible CauseProcedure
Trap or branch drain clogged at fixuresClear trap or drain at fixtures:
sinks, toilets, bathtubs, and showers

Two or more drains backed up

Possible CauseProcedure
Drainage system blocked below fixturesUnblock main drain from main cleanout
Have soil stack unblocked from roof vent

Odors or gurgling from drains

Possible CauseProcedure
Vent blockedHave soil stack unblocked from roof vent
Septic tank fullHave septic system serviced professionally

Basement floor drain backed up

Possible CauseProcedure
Main drain blockedUnblock main drain from main cleanout
House trap or sewer blockedCall for service

All drains sluggish or backed up

Possible CauseProcedure
Main drain blockedUnblock main drain from main cleanout
Sewer line blockedCall for service
Leak in sewer lineCall for service
Septic tank fullHave septic system serviced professionally
Main drain or sewer have insufficient slopeCall for service

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