Social & Preventive Medicine General 35801f9d A water sample with hardness level of 1 meq/ L is classified as: A Soft water B Moderately hard water C Hard water D Very hard water High-Yield Explanation Classification Hardness level (meq/L) Soft water < 1 Moderately hard water 1-3 Hard water 3-6 Very hard water >6 Ref: Park 21st edition page: 672.