Abstract: A liquid monitoring system may include a monitoring device configured to be positioned at a surface of a confined liquid body. The monitoring device may include a housing including walls defining a cavity. The monitoring device may include an internal sensing sub-system enclosed within the cavity. The internal sensing sub-system may include one or more liquid monitoring sensors configured to monitor a level, temperature, or quality of the confined liquid body. The liquid monitoring system may be configured to receive a set of liquid monitoring data from the one or more liquid monitoring sensors. The liquid monitoring system may be further configured to determine one or more liquid measurement values based on set of liquid monitoring data. The one or more liquid measurement values may include a liquid level measurement value, a temperature measurement value, or a liquid quality measurement value for the confined liquid body.