Health officials warn that floodwaters can easily contaminate pipelines, storage tanks, and household water supplies. When this happens, water intended for drinking, cooking, and other daily needs may no longer be safe for consumption. The Department of Health has repeatedly cautioned that exposure to flood-contaminated water increases the risk of waterborne diseases such as diarrhea, cholera, typhoid fever, and leptospirosis.

Experts advise residents to store potable water before heavy rains, boil tap water before drinking, and rely on safe bottled supplies if contamination is suspected. Communities in low-lying areas are considered most vulnerable, as flooding can linger and mix with untreated sewage and waste.

Authorities are also stressing the need for long-term solutions. These include upgrading drainage systems, strengthening water quality monitoring, and improving disaster preparedness at both community and household levels.

As Metro Manila continues to experience severe flooding during the rainy season, protecting access to clean water remains a pressing public health concern.