Do a statistical analysis, for example an OLS regression analysis with the dependent variable (water consumption) or (water quality) and independent variables as many as you want and a dummy variable. see this site it has an example of a regression analysis based on water consumption
https://www.journal.au.edu/abac_journal/2004/may04/abacvol24no2_artical05.pdf
Please Use visuals and analyze the results to prove the economical best approach mentioned in my project
https://waterdata.usgs.gov/nv/nwis/