The water hardness for the city of Milton Ontario is different depending on where in the city you live. Some areas of Milton are serviced by lake water and some older areas of the city are serviced by well water. Well water serviced areas are much harder than the lake serviced areas. The following data was acquired in August of 2016 directly from the water utility in Milton:
Well Water Supply
Hardness = 295 mg/L (20.7 grains per gallon)
Lake Water Supply
Hardness = 125mg/L (8.8 grains per gallon)
Well water supplied residents of Milton would benefit greatly from a water softener, while the lake water supplied residents would likely not need one.