RHI Calculator Spreadsheet Model Tool
The Relative Health Indicator (RHI) tool generates RHI values as output when chemical, microbiological, and water system information are input. The tool is anticipated to be useful to water utilities in multiple ways. Beyond compliance with MCLs, this tool allows utilities to identify contaminants in their treated drinking water that pose the highest remaining health risks in terms of RHI. Utilities may also compare RHI values from various water sources, or the effectiveness of various potential treatment technologies using this tool.