Source: Billings Public Utilities Dept. 406-657-8346
http://ci.billings.mt.us/government/utilities/parameters.html
Caveats and Definitions
Hardness of water is due primarily to calcium and magnesium. The State
of Montana has categorized moderately hard water to range between 85-205
MG/L. This parameter is not regulated by the State.
The Billings Public Utilities
Department changed from a fiscal year to a calendar year in 1996.
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