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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for CONNECTICUT
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.




BHC Company

Water Type - GROUND WATER
(Treate d Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Housatonic Wells 746 Ground Water APR 1998 - JUN 1998 45.5

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Easton Water Treatment Plant 262 Surface Water APR 1998 - JUN 1998 48.9
Hemlocks Water Treatment Facility 261 Surface Water APR 1998 - JUN 1998 40.6



Regional Water Authority

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Lake Gaillard Water Treatment Plant 266 Surface Water APR 1998 - JUN 1998 43
Lake Saltonstall Water Treatment Plant 267 Surface Water APR 1998 - JUN 1998 30.2
West River Water Treatm ent Plant 268 Surface Water APR 1998 - JUN 1998 23.7



THE METROPOLITAN DISTRICT

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
RESERVOIR #6 PLANT 265 Surface Water APR 1998 - JUN 1998 34.7
WEST HARTFORD SLOW SAND FILTERS 264 Surface Water APR 1998 - JUN 1998 31.4



WATERBURY BUREAU OF WATER

NO DATA - Click here to find out why.



Results for mixed water (ground water and surface water) and purchased water can be found under water sy stem 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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