Who pays when water runoff causes damage to a neighbour’s land?

The article addresses a common dispute in residential and mixed-use properties: who bears financial responsibility when water runoff from one property causes damage to an adjoining neighbour's land. This question sits at the intersection of property law, building design, and practical remediation, and often arises when drainage systems are inadequate, improperly maintained, or when development alters natural water flow patterns.

The legal position typically depends on whether the damage stems from negligence, breach of duty of care, or breach of statutory obligations under building codes and local planning requirements. Owners and strata managers need clarity on liability allocation, insurance coverage, and remedial obligations when water ingress or land damage occurs. Understanding these principles helps prevent costly disputes and informs how defective drainage systems should be rectified.