A system and method for harvested water irrigation is provided. The irrigation system generally collects harvested water from a variety of sources and disperses it from a tank to a landscape for irrigation. The irrigation may be managed using a system controller. The system controller interacts with a variety of devices, including a level controller, a pump or valve, and at least one zone valve. The system may be configured to end irrigation cycles in response to certain events and to supplement harvested water irrigation with potable water as needed or selected.