Harvesting rainwater provides an alternative source for garden irrigation, toilet flushing, and even laundry in some systems. By capturing and storing rainwater, homeowners can reduce their reliance on treated municipal water, making their households more self-sufficient and resilient. This approach helps mitigate stormwater runoff, which can carry pollutants into rivers and lakes, causing environmental harm. Incorporating rainwater systems into home design, therefore, not only conserves potable water but also helps maintain the health of surrounding water bodies, supporting local flora and fauna.