Unauthorized entry into residential swimming pools is a concerning issue which in many cases can lead to property damage, injury liabilities, or even death. The Neptune system will address this issue by constantly monitoring the pool environment for signs of intrusion. Utilizing Passive Infrared (PIR) sensors and audio analysis (microphone), Neptune will monitor the current risk associated with the pool. The PIR sensor will constantly monitor for people and animals that cross its field of view. The microphone will be listening to all sounds, and using machine learning and signal processing algorithms to identify when splash sounds occur. This twofold detection system will produce accurate results with a low probability of false alarms. When the pool is determined to be at risk (PIR sensor is tripped and a splash sound is detected), poolside alarms will sound and the user will receive a Multimedia Messaging Service (MMS) notification with a warning message and a picture of the pool environment.