Detected Contaminants Table from
Tucson Water 2009 Annual Water Quality Report

 

Disinfection By-products
Haloacetic acids (HAA)
Maximum Amount Found Maximum Contaminant Level Major Source
Dichloroacetic Acid       1.4 ppb 60 ppb  By-product of chlorination
Dibromoacetic Acid  2.1 ppb 60 ppb  By-product of chlorination
Total Haloacetic Acids (5)   3.5 ppb 60 ppb  By-product of chlorination
Running Annual Average for HAA5      <2 ppb 60 ppb   
Trihalomethanes (THM)      
Bromodichloromethane   2.3 ppb 80 ppb By-product of chlorination
Bromoform 5.8 ppb 80 ppb By-product of chlorination
Chloroform   1.5 ppb 80 ppb By-product of chlorination
Chlorodibromomethane   5.6 ppb 80 ppb By-product of chlorination
Total Trihalomethanes     14.5 ppb 80 ppb By-product of chlorination
Total Trihalomethanes  6.6 ppb    
Running Annual Average for TTHMS       
Inorganics      
Arsenic 9.1 ppb 10 ppb Natural deposits
Barium   0.15 ppm 2 ppm Natural deposits; Industrial Uses
Fluoride     1.0 ppm 4 ppm Natural deposits
Nitrate (as N) 7.7 ppm 10 ppm Natural deposits; septic tanks;agriculture;sewage
Sodium     101 ppm None Natural deposits
Volatile organics      
Total Xylenes    0.0015 ppm    10 ppm  Solvent used in paint coatings, adhesive, fuel
Synthetic organics      
Atrazine         1.3 ppb 3 ppb Runoff from herbicides used on raw crops
Di (2-ethylhexyl) phthalate  factories 0.7 ppb 6 ppb  Discharge from rubber and chemical
Simazine   0.05 ppb 4 ppb  Herbicide runoff
Radioactive Chemicals      
Alpha Emitters    2.2 pCi/L  15 pCi/L Natural Deposits
Uranium 4.7 ppb 30 ppb Natural Deposits

Lead and copper were also found in many collection sites, however, only one was above the maximum amount for lead and the cause for both are corroded household plumbing systems. 

Chlorine is also listed as a contaminant with a maximum contaminant level of 4ppm.  The annual average found throughout the distribution network was 0.86 ppm.