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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for LOUISIANA
JANUARY - MARCH 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.




CITY OF SHREVEPORT WATER

Water Type - SURFACE WATER
(Trea ted Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
T. L. AMISS WATER TREATMENT PLANT 391 Surface Water JAN 1998 - MAR 1998 14.4



Jefferson Parish Water Department

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Tota l Trihalomethanes Concentration (ppb)
East Bank Treatment Plant 393 Surface Water JAN 1998 - MAR 1998 34.4
West Bank Treatment Plant 394 Surface Water JAN 1998 - MAR 1998 35.7



Lafayette Utilities System

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
North Water Treatment Plant 395 Ground Water JAN 1998 - MAR 1998 7.2



New Orleans Sewerage & Water Board

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Carrollton Water Treatment Plant 397 Surface Water JAN 1998 - MAR 1998 14.6



THE BATON ROUGE WATER COMPANY

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
BANKSTON WEST 722 Ground Water JAN 1998 - MAR 1998 0
LULA WEST 392 Ground Water JAN 1998 - MAR 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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