Rainwater harvesting is an eco-friendly method to increase potable water supply for consumption and domestic use. It involves collecting rainwater from rooftops through gutters and downspouts into storage tanks. The collected water is filtered to remove debris and contaminants, with pre-filtration crucial for eliminating larger particles. Depending on regulations and usage, treatments like UV sterilization or chlorination may be used to ensure safety standards. The choice and placement of storage tanks—made from materials like plastic, fiberglass, or concrete—are important to prevent contamination and allow for maintenance. Regular inspections and cleaning are essential for water quality. Awareness of local regulations is also necessary, as they vary and may include health protection restrictions. Properly designed and maintained, rainwater harvesting provides a sustainable source of potable water, reducing reliance on municipal supplies.