Mould and mildew need moisture. Plumbing leaks are one possible source, but condensation, ventilation and rainwater can also contribute. Finding the source matters more than repeatedly wiping away a stain.
Look for where moisture begins
Check below sinks, around toilets and near the water heater for dampness. Notice whether a bathroom stays wet long after use or whether a basement patch appears only after rain. A sump pump or perimeter drain issue calls for a different response from a dripping supply connection.
Ventilate bathrooms as designed and repair active leaks promptly. If there is extensive mould or a health concern, seek the appropriate remediation or health advice rather than treating it as a plumbing-only problem.
Fix the water source
Photographs showing when and where moisture appears can help the assessment. Our plumbing repair team can investigate a suspected plumbing leak and explain the repair scope.
Separate a leak from other moisture
Moisture that appears only after a shower may point to splashing, enclosure details or ventilation. A cabinet that stays damp while fixtures are unused may suggest a supply leak. A basement patch that follows rain calls for a different investigation. Record when the area becomes wet and whether the water is clean or has an odour; do not assume every stain is caused by the nearest visible pipe.
Drying and cleaning may improve the surface, but persistent moisture will return until its source is addressed. If the affected area is extensive or anyone has a health concern, seek appropriate remediation advice in addition to any plumbing repair. Our bathroom checks can help identify visible leaks without opening a wall.