A drowning prevention system. The drowning prevention system includes a housing having a strap affixed to opposing ends thereof. The strap removably secures the housing to a user, such that a heartbeat sensor connected to a pair of contacts on the housing is in contact with the user. A moisture sensor is also disposed within the housing. An alert signal is sent to a mobile device via a wireless transceiver disposed within the housing when either the moisture sensor or the heartbeat sensor detects a predefined abnormal situation, such as heartrates above a threshold heartrate for an extended period or upon detection of the housing being submerged in a volume of liquid.