HomeHelpWaterWhat is Muscatine’s average water hardness? Water What is Muscatine’s average water hardness? Muscatine’s average water hardness is around 265 parts per million or 15.5 grains per gallon. Related Questions Video: Why Hydrant Flushing Is Important Video: How to Crew Water Service Lines - Who Owns What? How will flushing affect water service? Back to Water