"bar chart with calcium carbonates in parts per million indicated on the vertical scale, from 0 (""Soft"") to 200 (""Very Hard""). Three bars on the chart indicate the hardness as tested at each of PWDs three drinking water treatment plants. Belmont is indicated at slightly over 120 ppm, and Queen Lane is shown slightly over the 140 ppm line, both in the range considered ""Hard"".  The bar for Baxter indicates a bit over 90 ppm, considered ""Moderately Hard""."