Abstract: Groundwater is usually taken as the water source for water source heat pump. Compared with general groundwater, hot spring bathing wastewater has different temperature and in addition contains plenty of organic matters and microorganism. The quality of bathing wastewater from Chongqing South Hot Spring was detected and analyzed. Result shows that calcium and magnesium ions as well as sulfate ions exceed the standard design of Specification for the investigation and evaluation of shallow geothermal energy, and the turbidity, salinity, pH value, chlorine ion and silicon dioxide content meet the quality requirement of water supply. But it has high concentration of organic matter and biological contamination. If the wastewater is properly treated, it would be an ideal water supply for water source heat pump because of stable flow and relatively higher temperature.

Key words: hot spring bathing wastewater, water flow, water quality, water source heat pump, water source