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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for COLORADO
OCTOBER - DECEMBER 1997


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.




City of Aurora, Utilities Dept.

Water Type - SURFACE WATER
(Tr eated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Kuiper Water Treatment Plant 249 Surface Water OCT 1997 - DEC 1997 28.9
Wemlinger Water Treatment Plant 250 Surface Water OCT 1997 - DEC 1997 25



City of Boulder, Dept. of Utilities

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Betasso Water Treatment Plant 251 Surface Water OCT 1997 - DEC 1997 42



City of Fort Collins Water Utility

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Fort Collins Water Treatment Facility 259 Surface Water OCT 1997 - DEC 1997 22.4



Colorado Springs Utilities

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Mesa Water Treatment Plant 257 Surface Water OCT 1997 - DEC 1997 30.7
Pine Valley Water Treatment Plant 256 Surface Water OCT 1997 - DEC 1997 38.6



Denver Water

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Foothills WTP 253 Surface Water OCT 1997 - DEC 1997 28.9
Moffat WTP 255 Surface Water OCT 1997 - DEC 1997 24.3



Pueblo Board of Water Works

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Whitlock Water Treatment Facility 260 Surface Water OCT 1997 - DEC 1997 7.1



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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