Signs of a sewer blockage include
• Toilets, basins, baths or tubs are slow to empty or overflow or fill
• Gully-trapss in the yard overflow when the toilet is flushed or when basins or baths are released.
• Overflowing sewer access pits (manholes) in the verge or back yard, or gurgling noises in the sanitary drains

• Rubbish, toys, balls, nappies, clothing, sanitary pads, fat loam, sand and other wastes.
• Tree roots entering the sewer drain pipes through cracks, faulty joints o rloose inspection openings.
• Crushed or flattened pipes that have been damaged by movement of the sub-soil, penetration of rocks or by overloading the ground with retaining walls, building structures and motor vehicle traffic.
• Improperly laid pipes or subsidence in the earth, which causes the pipes to hold water or even slope in the wrong direction.
• The illegal connection of stormwater downpipes to the sewer causing them to overflow when it rains.

Where sewer drains can block
• In any part of the sanitary drain within the property
• In the tie where the sanitary drains connect to the Council branch line
• In the Council branch line (between the main and the tie)
• In the Council sewer main or access pit (manhole)