Hardness does not affect the safety of water. Calcium and magnesium are the minerals in water which make it hard. The cloudy water is caused by tiny air bubbles in the water similar to the gas bubbles in soda pop. After a little while, the bubbles rise to the top and are gone. This cloudiness occurs more often in the winter when the drinking water is cold.
Chlorine is added to the water as a disinfectant to kill harmful bacteria and viruses.
It is the most common method of disinfecting drinking water. Fluoride is added to the water, as required by law, to protect teeth. Some home filtration devices remove fluoride from water and bottled water may or may not contain fluoride. Check your toilet for leaks. Put a little food coloring into your toilet tank and let it sit for 15 minutes.