A stormwater harvesting system's size, complexity, location, and intended purpose can all affect its overall cost. Small-scale residential systems designed for garden irrigation may cost a few hundred to a few thousand dollars, covering gutters, tanks, filters, and basic plumbing. Larger commercial or municipal systems designed to supply water for landscaping, cooling, or industrial processes can range from tens of thousands to over a hundred thousand dollars.
These systems often require engineering design, excavation, advanced filtration, pumps, and automation, which increase costs. Maintenance expenses should also be factored in, as regular cleaning and inspections are needed to keep the system operating efficiently. Despite the upfront investment, stormwater harvesting can lead to long-term savings by reducing water bills, minimizing flood damage, and decreasing the strain on public infrastructure. Incentives, grants, or rebates offered by local governments can help offset initial costs, making the systems more accessible
