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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for ARIZONA
APRIL - JUNE 1998


REMINDER: Data Purpose: The ICR data were collected as part of a national research project to support development of national drinking water standards. They should NOT be used to determine local water systems compliance with drinking water standards, nor should they be used to make personal judgements about individual health risks.

Units: Sample measurements are taken in micrograms per Liter (ug/L) and are regulated in milligrams per Liter (mg/L). A microgram per Liter is equivalent to one contaminant part per billion (ppb). A ppb can be thought of as one grain of salt in a swimming pool. Data for Total Trihalomethanes, haloacetic acids 5, and bromate are presented in ppb. 1 mg/L = 1000 ug/L, or 0.080 mg/L = 80 ug/L = 80 ppb, which happens to be the TTHM standard in the Stage 1 DBP Rule.

Calculation in Regulations is Different: Comparisons with compliance calculations based on the existing Total Trihalomethanes standard in CFR Part 141.30 may not be warranted since the standard i s based on an annual average of public water system quarterly averages and not on treatment plant results as shown here. Also the results here are based on different types of samples.

Results of Zero: A result of zero may indicate that a sample was analyzed, but that the result was less than the lowest value that the analytical method can reliably report.




Chandler Municipal Water Department

Water Type - GROUND WATER
(Treated Wa ter)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
GROUNDWATER 125 Ground Water APR 1998 - JUN 1998 13.1

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
S URFACE WATER TREATMENT PLANT 124 Surface Water APR 1998 - JUN 1998 61.1



City of Glendale

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Wells 736 Ground Water APR 1998 - JUN 1998 46.9

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Cholla Water Treatment Plant 126 Surface Water APR 1998 - JUN 1998 122
Pyramid Peak Water Treatment Plant 127 Surface Water APR 1998 - JUN 1998 76.8



City of Mesa, Utility

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
CW18 724 Ground Water APR 1998 - JUN 1998 27.8

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
CAP WTP 128 Surface Water APR 1998 - JUN 1998 63.6



City of Scottsdale

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Groundwater Treatment Facility 130 Ground Water APR 1998 - JUN 1998 13.5
Well #53 752 Ground Water APR 1998 - JUN 1998 0

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
CAP Water Treatment Plant 129 Surface Water APR 1998 - JUN 1998 49.4



City of Tempe

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Papago Water Treatment Plant 131 Surface Water APR 1998 - JUN 1998 49
South Water Treatment Plant 132 Surface Water APR 1998 - JUN 1998 54.2



Phoenix Municipal Water System

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
DEER VALLEY WTP 122 Surface Water APR 1998 - JUN 1998 57.4
SQUAW PEAK WTP 119 Surface Water APR 1998 - JUN 1998 63.7
UNION HILLS WTP 121 Surface Water APR 1998 - JUN 1998 33.7
VAL VISTA WTP 120 Surface Water APR 1998 - JUN 1998 68.2
VERDE WTP & FOUNTAIN HILLS 123 Surface Water APR 1998 - JUN 1998 57.8



Tucson Water

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Avra Valley 133 Ground Water APR 1998 - JUN 1998 .8
Tucson Basin 134 Ground Water APR 1998 - JUN 1998 0



Results for mixed water (ground water and surface water) and purchased water can be found under water system summary reports.


How does this state's treated water compare to treated waters nationally for Total Trihalomethanes?
View national data for the same month.


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