Most hotels do not monitor individual guest water usage in real-time or at the room-level for billing purposes, but the industry is rapidly adopting "smart" conservation technologies that provide this data for sustainability goals. Traditionally, hotels only see the "total consumption" for the entire building via a single municipal water meter. However, as of 2026, an increasing number of eco-conscious and high-end hotels are installing devices like "HydroSense" or "Aguardio" shower sensors. These sensors can detect the duration of a shower and the volume of water used, often providing real-time feedback to the guest via a small display in the bathroom (sometimes using "nudges" like a color-changing light or a disappearing polar bear icon). While this data is typically used to encourage "pro-environmental behavior" rather than to issue a "water surcharge," the information is accessible to the hotel management via a web-based dashboard. Furthermore, hotels can easily detect significant water anomalies, such as a running toilet or a forgotten tap, through automated leak detection systems that monitor flow patterns at the "riser" or floor level, allowing them to dispatch maintenance to a specific room if a flood is suspected.