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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for VIRGINIA
JULY - SEPTEMBER 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.




Appomattox River Water Authority

NO DATA - Click here to find out why.



City of Norfolk, Dept. of Utilities

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
37th Street 677 Surface Water JUL 1998 - SEP 1998 59.7
Moores Bridges 676 Surface Water JUL 1998 - SEP 1998 116.5



City of Portsmouth, DPU

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Lake Kilby Water Treatment Facility 678 Surface Water JUL 1998 - SEP 1998 81.1



City of Roanoke, Roanoke, Va.

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Crystal Springs Pumping Station 669 Ground Water JUL 1998 - SEP 1998 23.8

W ater Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Carvins Cove Water Filtration Plant 671 Surface Water JUL 1998 - SEP 1998 57.4



Fairfax County Water Authority

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Corbalis WTP 684 Surface Water JUL 1998 - SEP 1998 66.7
Occoquan/Lorton WTP 685 Surface Water JUL 1998 - SEP 1998 90.6



NEWPORT NEWS WATERWORKS

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Harwood's Mill 675 Surface Water JUL 1998 - SEP 1998 56
Lee Hall 673 Surface Water JU L 1998 - SEP 1998 63.3



Richmond Department of Public Utilities

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Water Purification Plant 683 Surface Water JUL 1998 - SEP 1998 41.4



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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