We live in a row of 6 very old terraced houses in a rural location, been here 20 years. We are the end house and the drains all connect through the back gardens. I’m the last houses so all the drains run through mine to the main sewer.
Yesterday my immediate newish neighbour knocked and said his drain was blocked, he’d had a word with neighbours further up the row and had told him l was the problem house! I inspected my drain and all l have going into the drain is downstairs sink and washing machine, bathroom at the front of the house so different stench pipe. My drain is running clear into the main sewer, however the pipe running from the remaining 5 houses appears blocked with cloudy sediment, to be clear my drain doesn’t run into this, it’s runs to the right into the main sewer. Clearly what’s happened is that over time neighbours waste (many gave downstairs toilets and dishwashers etc running into drain) have blocked the drain along the row and won’t go past mine so is backing up.
Neighbour is expecting me to clear the blockage, AIBU to say that it’s everyone’s responsibility, not mine alone.