It is possible for the tank to flood or overflow. If your property is subject to extensive rainfall and flooding, your tank may be flooded by the excessive rainwater. The circuit breaker at your house should shut the power and protect the system. You should not reconnect the power until the water level falls again. Contact Earthsafe Environmental / Agent for advice before reconnecting power to the system. It is also possible for the pump to fail, irrigation filter/lines to become blocked or the power to fail for some reason. In such events, the water level in the tank could rise and flood the system and eventually flow out of the lid. Usually the alarm and RED or YELLOW LED should have warned you of the situation. Contact Earthsafe Environmental / Agent immediately for advice and appropriate action to take.