Jump to main content.

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




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 OCT 1997 - DEC 1997 39.3
Moores Bridges 676 Surface Water OCT 1997 - DEC 1997 62.1



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 OCT 1997 - DEC 1997 73.1



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 OCT 1997 - DEC 1997 16.1

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Carvins Cove Water Filtration Plant 671 Surface Water OCT 1997 - DEC 1997 70.7



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 OCT 1997 - DEC 1997 77.3
Occoquan/Lorton WTP 685 Surface Water OCT 1997 - DEC 1997 53



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 OCT 1997 - DEC 1997 96.3
Lee Hall 673 Surface Water O CT 1997 - DEC 1997 107.3



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 OCT 1997 - DEC 1997 42



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.

ICR Overview
Envirofacts Home Page

Local Navigation

Jump to main content.