A blockage can stop, or reduce, the flow of sewage through sewer pipes. If this happens then there is a possibility that sewage can back up in the underground pipe network and overflow from manholes in roads, in gardens, or on private land. Blockages can also lead to a pollution of a river, or can even cause your toilet to overflow and flood your house.
If you notice a strong unusual smell around sewer pipe covers, or that water is very slow to drain from your toilet, then you might have a blockage. Other possible symptoms might be water seeping from chambers or manholes in your garden or overflowing from gullies next to your house.
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