In Sunderland properties, hidden leaks often trace back to leaking supply joints beneath riverside properties in pallion and millfield, difficult to spot due to existing ground dampness or corroded supply pipework in victorian terraces in hendon and millfield reaching the end of its working life. Watch for a higher water bill, damp or warm patches on the floor, a hissing sound near pipework, or lower water pressure. Properties such as Victorian terraces, inter-war semis, post-war council housing, and coastal properties in Roker and Seaburn are worth checking often, since a leak can run for weeks before it shows.