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.