Typical Water Quality Values

This list is a supplement to the Annual Water Quality report. It is meant to give an estimate of the types of compounds analyzed and the levels at which they are found. If you need specific information please feel free to contact the water quality laboratory at 480-350-8330 or view the annual water quality report. The numbers may vary throughout the year due to varying water sources however, the annual averages are relatively consistent from year to year. Unless otherwise stated, these numbers were taken from data gathered between Jan - Dec 2010.

Many of the following parameters are regulated by the Safe Drinking Water Act of 1974 and the 1986 Amendments. Analyses are preformed as required and the concentrations of the regulated parameters detected in Tempe water are LESS THAN the Maximum Contaminant Levels (MCL's).

Inorganic Chemicals - metals, salts and minerals can be naturally occurring or result of urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining or farming runoff.

Metals   Lead   Regulated Inorganics      Unregulated Inorganics   Hardness    

Volatile Organic Chemicals (VOC's)-These are carbon containing chemicals which readily travel from the water into the air. Most are industrial chemicals, solvents or petroleum by-products. 

Synthetic Organic Chemicals (SOC's)-These are man-made carbon containing chemicals such as pesticides, herbicides and polychlorinated bi-phenyls (PCB's)

RadioChemicals- Naturally occurring or man-made, as a result of oil and gas production and mining activities, radioactive compounds.

EPA Required Unregulated Contaminant Monitoring (UCMR)

Metals ~ Drinking Water Values

 

 Analyte  MCL (mg/l)  Average Value (mg/l)
 Antimony  0.006  <0.003
 Arsenic  0.01  <0.0058
 Barium  2  <0.11
 Beryllium  0.004  <0.001
 Cadmium  0.005  <0.002
 Chromium  0.1  <0.012
 Mercury  0.002  <0.0002
 Nickel  0.1  <0.005
 Selenium  0.05  <0.0015
 Thallium  0.002  <0.001
     
   Action Level *  
 Lead (2009)  0.015   <0.0036
 Copper (2009)  1.3  0.075
     
   SMCL **  
 Iron  0.3  <0.05
 Manganese  0.05  <0.001
 Silver  0.1  <0.002
 Zinc  5  <0.02
     

* Action Level- if the value of either Lead or Copper values exceed the Action Level additional treatment techniques are required as per the "Lead and Copper Rule".

** SMCL- secondary maximum contaminant level, a number associated with the aesthetic quality of water. According to the EPA these numbers are guidelines not enforceable standards. There are no health problems associated with these compounds.

Regulated Inorganics ~ Drinking Water Values

 Analyte  MCL (mg/l)   Average Value (mg/l)
 Asbestos (2011 data)  7 MFL*  <0.2
 Cyanide  0.2  <0.01
 Fluoride  4  0.24
 Nitrate  10  <6.6
 Nitrite  1  <0.15
 Nitrate/Nitrite  10  <6.6

  *million fibers/liter longer than 10um

Unregulated Inorganics of Interest ~ Drinking Water Values

 Analyte  Range Detected  Typical Values
 Temperature (ºF)(2009 Jan-Nov)  55 - 86  73
 Chlorine Residual  0.03 - 1.9  0.63
 pH (pH Units)  7.4 - 8.0  7.7
 Turbidity (NTU)*  0.01 - 0.25  0.04
 Conductivity**  592 - 1730  901
 Chloride  100 - 330  144
 Alkalinity***  120 - 380  136
 Hardness^  150 - 400 mg/l  168 mg/l
   8.8 -23.4 grains/gallon  9.8 grains/gallon
 Calcium  37 - 95  40.8
 Magnesium  14 - 39  16.2
 Molybdenum (2002)  ND  <0.05
 Total Dissolved Solids  330 -1000  474
 Sulfate  41 - 130  55
 Sodium  69 - 290  97
 Aluminum  ND - 0.12  0.1
 Boron  0.06 - 0.58  0.1
 Potassium  4.8 - 8.9  5.2
 Silica  9.2 - 32  10.1
 Bromide  ND - 0.24  <0.05
 Cryptosporidium(2009)  ND ND
 Giardia Lamblia(2009)  ND                              ND
 Coliform^^  ND - 3.9%  ND
 TOC  1.6 - 4.1  3.2

Results are expressed in mg/l except 
*NTU= Nephelometric Turbidity Unit (measure of water clarity) maximum monthly average value 
**MHOS/CM (micromhos per centimeter) units used to measure conductance 
***Alkalinity and hardness are reported as mg/l calcium carbonate (CaCO3) 
^ Customers are often interested in Hardness expressed in grains per gallon, for settings on dishwashers or water softeners. To calculate grains per gallon, divide the hardness value in mg/l by 17.1 
^^ Coliform MCL, is defined as presence of coliform bacteria in 5% or more of monthly samples. Tempe is required to collect 120 samples/ month for coliform.
ND-not detected.


Regulated Volatile Organic Chemicals ~ Drinking Water Values
 Analyte MCL (mg/l)   Average Value (mg/l) 
 1,1-Dichloroethylene  0.007  <0.0005
 1,1,1-Trichloroethane  0.2  <0.0005
 1,1,2-Trichloroethane  0.005  <0.0005
 1,2-Dichloroethane  0.005  <0.0005
 1,2-Dichloropropane  0.005  <0.0005
 Benzene  0.005  <0.0005
 Carbon Tetrachloride  0.005  <0.0005
 cis-1,2-Dichloroethylene  0.07  <0.0005
 Ethylbenzene  0.7  <0.0005
 (mono)chlorobenzene  0.1  <0.0005
 o-Dichlorobenzene  0.6  <0.0005
 para-Dichlorobenzene  0.075  <0.0005
 Styrene  0.1  <0.0005  
 Tetrachloroethylene(PCE)  0.005  <0.0005
 Toluene  1  <0.0005
 trans-1,2-Dichloroethylene  0.1  <0.0005
 Trichloroethylene(TCE)  0.005  <0.0005
 Vinyl Chloride  0.002  <0.0005
 Xylenes, total  10  <0.001
 1,2,4-Trichlorobenzene  0.07  <0.0005
 Dichloromethane  0.005  <0.0005
 Trihalomethanes (TTHM's)  0.08  <0.062

 

The VOC program consists of monitoring the distribution system and wells for approximately 40 other compounds which are currently unregulated. For these compounds the Minumum Reporting Levels (MRL's) are listed. The MRL is the lowest limit accurately detected by the instrument.

Unregulated Volatile Organic Chemicals ~ Drinking Water Values

Analyte    MRL (mg/l)  Average Value (mg/L)
 Dichlorodifluoromethane  0.0005  <0.0005
 Chloromethane  0.0005  <0.0005
 Bromomethane  0.0005  <0.0005
 Chloroethane  0.0005  <0.0005
 Trichlorofluoromethane  0.0005  <0.0005
 1,1-Dichloroethane  0.0005  <0.0005
 Bromochloroethane  0.0005  <0.0005
 2,2-Dichloropropane  0.0005  <0.0005
 1,1-Dichloropropene  0.0005  <0.0005
 Dibromomethane  0.0005  <0.0005
 cis-1,3-Dichloropropene  0.0005  <0.0005
 trans-1,3-Dichloropropene  0.0005  <0.0005
 1,3-Dichloropropane  0.0005  <0.0005
 1,2-Dibromomethane  0.0005  <0.0005
 1,1,1,2-Tetrachloroethane  0.0005  <0.0005
 1,1,2,2-Tetrachloroethane  0.0005  <0.0005
 1,2,3-Trichloropropane  0.0005  <0.0005
 Isopropylbenzene  0.0005  <0.0005
 Bromobenzene  0.0005  <0.0005
 n-Propylbenzene  0.0005  <0.0005
 2-Chlorotoluene  0.0005  <0.0005
 4-Chlorotoluene  0.0005  <0.0005
 1,3,5-Trimethylbenzene  0.0005  <0.0005
 tert-Butylbenzene  0.0005  <0.0005
 1,2,4-Trimethylbenzene  0.0005  <0.0005
 sec-Butylbenzene  0.0005  <0.0005
 p-Isoproplytoluene  0.0005  <0.0005
 1,3-Dichlorobenzene  0.0005  <0.0005
 n-Butylbenzene  0.0005  <0.0005
 1,2,3-Trichlorobenzene  0.0005  <0.0005
 Methyl tert-Butyl Ether (MTBE)  0.0005  <0.0005
 Chloroform  0.0005  0.0283
 Bromoform  0.0005  0.0017
 Bromdichloromethane  0.0005  0.0218
 Chlorodibrommethane  0.0005  0.0118

Additional Unregulated VOC’s Monitored in 2003.
 Analyte  MRL (mg/l)  Average Value (mg/L)
 2-Butanone  0.005    <0.005  
 4-Methyl-2-pentanone  0.005  <0.005
 Di-isopropyl ether  0.003  <0.003
 Hexachlorobutadiene  0.0005  <0.0005
 Naphthalene  0.0005  <0.0005
 tert-Amyl methyl ether  0.003  <0.003
 tert-Butyl ethyl ether  0.003  <0.003
 Trichlorotrifluoromethane  0.0005  <0.0005
 2, 2-Dichloropropane  0.0005   <0.0005

 

Regulated Synthetic Organic Chemicals ~ Drinking Water Values

 Analyte MCL (mg/l)  Typical Value (mg/l)  
 2,4-D  0.07  <0.004
 2,4,5-TP (Silvex)  0.05  <0.002
 Toxaphene  0.003  <0.002
 Alachlor  0.002  <0.002
 Atrazine  0.003  <0.0008
 Carbofuran  0.04  <0.001
 Pentachlorophenol  0.001  <0.001
 Chlordane  0.002  <0.001
 Dibromochloropropane(DBCP)  0.0002  <0.00001
 Ethylene Dibromide(EDB)  0.00005  <0.002
 Heptachlor  0.0004  <0.00004
 Heptachlor Epoxide  0.0002  <0.00002
 Lindane  0.0002  <0.00002
 Benzo(a)Pyrene  0.0002  <0.00002
 Dalapon  0.2  <0.0012
 Di(2-ethylhexyl)phthalate  0.006  <0.0006
 Di(2-ethylhexyl)adipate  0.4  <0.0006
 Dinoseb  0.007  <0.0002
 2,3,7,8-TCDD (Dioxin)  3x10-8  <5 x10-9
 Diquat  0.02  <0.0004
 Endothall  0.1  <0.005
 Endrin  0.002  <0.00001
 Glyphosate  0.7  <0.006
 Hexachlorobenzene  0.001  <0.00005
 Hexachlorocyclopentadiene  0.05  <0.00005
 Oxamyl  0.2   <0.002
 Picloram  0.5  <0.0001
 Simazine  0.004  <0.00005
 Methoxychlor  0.04  <0.00005
 PCB:Polychlorinated Biphenyls  0.0005  <0.0001
 Total Haloacetic Acids  0.06  <0.024

 

The SOC program consists of monitoring the distribution system and wells for approximately 30 other compounds which are currently unregulated. For these compounds the Minimum Reporting Levels (MRL's) are listed. The MRL is the lowest limit accurately detected by the instrument.

Unregulated SOC's ~ Drinking Water Values

Analyte   MRL (mg/l) Average Value (mg/l)  
 Aldicarb  0.0005  <0.0005
 Aldicarb Sulfoxide  0.0005  <0.0005
 Aldicarb Sulfone  0.0008  <0.0007
 3-Hydroxycarbofuran  0.002  <0.002
 Aldrin  0.00005  <0.00005
 Propachlor  0.00005  <0.00005
 Butachlor  0.00005  <0.00005
 Carbaryl  0.002  <0.002
 Dicamba  0.00008  0.00008
 Dieldrin  0.0002  <0.0002
 Methomyl  0.001  <0.001
 Metolachlor  0.00005  <0.00005
 Metribuzin  0.00005  <0.00005
   Trigger Value*  
 Arocholr 1016  0.00008  <0.00007
 Arocholr 1221  0.02  <0.0001
 Arocholr 1232  0.0005  <0.0001
 Arocholr 1242  0.0003  <0.0001
 Arocholr 1248  0.0001  <0.0001
 Arocholr 1254  0.0001  <0.0001
 Arocholr 1260  0.0002  <0.0001

*If any trigger value is exceeded, then further testing must be performed for Decachlorobiphenyl

Additional Unregulated SOC’s monitored in 2002.
 Analyte MRL (mg/l)  Average Value (mg/l) 
 2,4,5-T  0.0002  <0.0002
 2,4-DB  0.002  <0.002
 3,5-Dichlorobenzoic Acid  0.0005  <0.0005
 4-Nitrophenol  0.001  <0.001
 Acenaphthylene  0.0001  <0.0001
 Acifluorfen  0.0002  <0.0002 
 alpha-BHC  0.00001  <0.00001
 Anthracene  0.00002  <0.00002
 Baygon  0.002  <0.002
 Bentazon  0.0005  <0.0005
 Benz(a)anthracene  0.00005  <0.00005
 Benzo(b)fluoranthene  0.00002  <0.00002
 Benzo(g,h,i)perylene  0.00005  <0.00005
 Benzo(k)fluoranthene  0.00002  <0.00002
 beta-BHC  0.00001  <0.00001
 Bromacil  0.0002  <0.0002
 Butylbenzlyphthalate  0.0005  <0.0005
 Caffene  0.00005  <0.00005
 Chlorthanlonil  0.00001  <0.00001
 Chrysene  0.00002  <0.00002
 DCPA total  0.0002  <0.0002
 delta-BHC  0.00001  <0.00001
 Diazinon  0.0001  <0.0001
 Dibenz(a,h)anthracene  0.00005  <0.00005
 Dichloroprop  0.0005  <0.0005
 Diethylphthalate  0.0005  <0.0005
 Dimethoate  0.01  <0.01
 Dimethylphthalate  0.0005  <0.0005
 D-n-butylphthalate  0.0005  <0.0005
 Endosulfan I  0.00001  <0.00001
 Endosulfan II  0.00001  <0.00001
 Endosulfan Sulfate  0.00001  <0.00001
 Endrin Aldehyde  0.00001  <0.00001
 Fluoranthene  0.0001  <0.0001
 Fluorene  0.00005  <0.00005
 Indeno(1,2,3,c,d)pyrene  0.00005  <0.00005
 Isophorone  0.0005  <0.0005
 Methiocarb  0.002  <0.002
 Molinate  0.0002  <0.0002
 p,p-DDD  0.00001  <0.00001
 p,p-DDE  0.00001  <0.00001
 p,p-DDT  0.00001  <0.00001
 Paraquat  0.002  <0.002
 Phenanthrene  0.00002  <0.00002
 Prometryn  0.0005  <0.0005
 Propachlor  0.00005  <0.00005
 Pyrene  0.00005  <0.00005
 Thiobencarb  0.0002  <0.0002
 trans-Nonachlor  0.00005  <0.00005
 Trifluralin  0.0001  <0.0001

 

 RadioChemicals ~ Drinking Water Values (2008 data)

 Analyte MCL (pCi/l)   Typical Value (pCi/l)
 Gross Alpha  15  5.1
 Combined Radium-226, Radium-228 *  5  0.5
 Radium 226    <0.5
 Radium 228    <0.5
 Gross Beta  50**  <4 mrem
 Tritium  20,000  <315
 Strontium 90  8  <0.6
 Radon    346
 Uranium  30ppb  3.6

 
* Radium 226 and Radium 228 are not required to be analyzed separately when Gross Alpha is less than 5 pCi/l, it is assumed that their value is also less than 5 pCi/l. 
** 50 pCi/l is the approximate equivalent to 4 millirem/year


Unregulated Contaminant Monitoring Rule (UCMR) ~ 2002 Data
These compounds do not currently have Maximum Contaminant Levels the EPA is gathering data to help them establish regulatory limits. For these compounds the Minimum Reporting Levels (MRL) are listed. The MRL is the lowest limit accurately detected by the instrument.(2002 data)

The 12 substances which EPA identified for Tempe to monitor included compounds used in explosives, insecticides, herbicides, gasoline and solid fuel propellant additives. None of these compounds were detected in the drinking water monitoring conducted over a 12 month period.

 Analyte  MRL (mg/l)  Average Value is (mg/l)
 Perchlorate  0.004  <0.004
 2,4-Dinitrotoluene  0.002  <0.002
 2,6-Dinitrotoluene  0.002  <0.002
 Acetochlor  0.002  <0.002
 4,4'-DDE  0.0008  <0.0008
 DCPA mono-acid degradate  0.002  <0.001
 DCPA di-acid degradate  0.001  <0.001
 EPTC  0.001  <0.001
 Molinate  0.0009  <0.0009
 Terbacil  0.002  <0.002
 MTBE  0.005  <0.005
 Nitrobenzene  0.01  <0.010

 
Unregulated Contaminant Monitoring Rule (UCMR2) ~ 2008 Data
These compounds do not currently have Maximum Contaminant Levels the EPA is gathering data to help them establish regulatory limits. For these compounds the Minimum Reporting Levels (MRL) are listed. The MRL is the lowest limit accurately detected by the instrument.(2008 data)

The 25 substances which the EPA identified for Tempe to monitor included compounds reladed to insecticides, herbicides, flame retardants, contaminants used in explosives, and chemical compounds that exist in sources of drinking water or that form when disinfectants are added to water to kill microbes. None of these compounds were detected in the drinking water monitoring which was conducted over a 12 month period.

 Analyte  MRL (mg/l)  Average Value (mg/l) 
 acetochlor  2  < 2
 acetochlor ESA  1  < 1
 acetochlor OA  2  < 2
 alachlor  2  < 2
 alachlor ESA  1  < 1
 alachlor OA  2  < 2
 metolachlor  1  < 1
 metolachlor ESA  1  < 1
 metolachlor OA  2  < 2
 N-nitroso-di-n-butylamine  0.004  < 0.004
 N-nitroso-diethylamine  0.005  < 0.005
 N-nitroso-dimethylamine  0.002  < 0.002
 N-nitroso-di-n-propylamine  0.007  < 0.007
 N-nitroso-methylethylamine  0.003 < 0.003
 N-nitroso-pyrrolidine  0.002  < 0.002
 1,3-dinitrobenzene  0.8  < 0.8
 2,2',4,4',5,5'-hexabromobiphenyl  0.7  < 0.7
 2,2',4,4',6-pentabromodiphenyl ether  0.5  < 0.5
 2,2',4,4',5,5'-hexabromodiphenyl ether  0.8  < 0.8
 2,2',4,4'-tetrabromodiphenyl ether  0.3  < 0.3
 2,2',4,4',5-pentabromodiphenyl ether  0.9  < 0.9
 dimethoate  0.7  < 0.7
 hexahydro-1,3,5-trinitro-1,3,5-triazine  1  < 1
 terbufos sulfone  0.4  < 0.4
 2,4,6-trinitrotoluene  0.8  < 0.8