A water conservation apparatus is connectable to a legacy irrigation controller to provide access to the irrigation controller to enable a remote user to selectively disable watering irrespective of the watering schedule programmed in the irrigation controller. The apparatus is connectable to the rain sensor of irrigation controllers having rain sensor connections. In irrigation controllers not having rain sensor connections, the apparatus is connectable to the common line of the valve control lines to selectively interrupt current to the valves. The apparatus is connectable to a Wi-Fi router to enable communications to a cloud-based server such that the apparatus is able to receive control signals from the server to selectively disable watering based on current and predicted weather conditions.
