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EF/ ICR Logo Source Water (Untreated) Levels of Virus for
Zone 7 Water Agency


Water System Virus Report
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 health risks.

Results of Zero: A measurement of zero means that no Virus was found in the sample volume that was analyzed. Zero results do not indicate the absence of Virus in the source water because the method recovery is low and the amount of sample analyzed is small. In other words, Virus may be present in source water even if no virus are counted for the sample volume analyzed.

Efforts Beyond Regulations: Many large public water systems are voluntarily improving the control of pathogens by participating in the Pa rtnership for Safe Water, an initiative between EPA, the States, and water suppliers to improve the performance of treatment.


Source Water (Untreated) Levels of Virus for Del Valle Water Treatment Plant

Water Type Month Virus Level (MPN/100L) Volume Analyzed
Surface Water JUL 1997 0 100
Surface Water AUG 1997 0 100
Surface Water SEP 1997 0 100
Surface Water OCT 1997 0 100
Surface Water NOV 1997 0 100
Surface Water DEC 1997 0 100
Surface Water JAN 1998 0 100
Surface Water FEB 1998 0 100
Surface Water MAR 1998 0 100
Surface Water APR 1998 0 100
Surface Water MAY 1998 0 100
Surface Water JUN 1998 0 100
Surface Water JUL 1998 0 100
Surface Water AUG 1998 0 100
Surface Water SEP 1998 0 100
Surface Water OCT 1998 0 100
Surface Water NOV 1998 0 100
Surface Water DEC 1998 0 100


Source Water (Untreated) Levels of Virus for Patterson Pass Water Treatment Plant

Water Type Month Virus Level (MPN/100L) Volume Analyzed
Surface Water JUL 1997 1 100
Surface Water AUG 1997 0 100
Surface Water SEP 1997 0 100
Surface Water OCT 1997 0 100
Surface Water NOV 1997 0 100
Surface Water DEC 1997 0 100
Surface Water JAN 1998 0 100
Surface Water FEB 1998 0 100
Surface Water MAR 1998 0 100
Surface Water APR 1998 NO DATA NO DATA
Surface Water MAY 1998 0 100
Surface Water JUN 1998 0 100
Surface Water JUL 1998 0 100
Surface Water AUG 1998 0 100
Surface Water SEP 1998 0 100
Surface Water OCT 1998 0 100
Surface Water NOV 1998 0 100
Surface Water DEC 1998 0 100


How does this utility's source water compare to source waters nationally for virus? Click on "view report" to see the state and national levels of virus.

Month State Report National Report
July 1997 view report view report
Aug 1997 view report view report
Sep 1997 view report view report
Oct 1997 view report view report
Nov 1997 view report view report
Dec 1997 view report view report
Jan 1998 view report view report
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Mar 1998 view report view report
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Dec 1998 view report view re port


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