Source Water (Untreated) Levels of Giardia for
ST. LOUIS COUNTY WATER COMPANY

Water System Giardia 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.

Detection Method Limitations: The ICR method for detecting Cryptosporidium and Giardia has technical limitations.

Results of Zero: A measurement of zero means that no Giardia was found in the sample volume that was analyzed. Zero results do not indicate the absence of Giardia in the source water because the method recovery is low and the amount of sample analyzed is small. In other words, Giardia may be present in source water even if no cysts are counted for the sample volume analyzed. The presence of Giardia may also be mistakenly identified as other organic material such as algae.

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 Giardia for Central Plant 1 & 2

Water Type	Month	Giardia Level (#cysts/100L)	Volume Analyzed
Surface Water	JUL 1997	NO DATA	NO DATA
Surface Water	AUG 1997	0	.4
Surface Water	SEP 1997	0	.1
Surface Water	OCT 1997	0	.3
Surface Water	NOV 1997	391.4	.8
Surface Water	DEC 1997	0	.1
Surface Water	JAN 1998	0	.2
Surface Water	FEB 1998	0	.1
Surface Water	MAR 1998	0	.2
Surface Water	APR 1998	0	.1
Surface Water	MAY 1998	855.4	.1
Surface Water	JUN 1998	0	.2
Surface Water	JUL 1998	0	.1
Surface Water	AUG 1998	0	.1
Surface Water	SEP 1998	0	.2
Surface Water	OCT 1998	0	.1
Surface Water	NOV 1998	0	.03
Surface Water	DEC 1998	489.2	.2

Source Water (Untreated) Levels of Giardia for North County Plant

Water Type	Month	Giardia Level (#cysts/100L)	Volume Analyzed
Surface Water	JUL 1997	NO DATA	NO DATA
Surface Water	AUG 1997	0	.4
Surface Water	SEP 1997	0	.1
Surface Water	OCT 1997	0	.2
Surface Water	NOV 1997	456.8	.4
Surface Water	DEC 1997	156.5	.6
Surface Water	JAN 1998	390.8	.3
Surface Water	FEB 1998	0	.1
Surface Water	MAR 1998	901.7	.1
Surface Water	APR 1998	924.2	.1
Surface Water	MAY 1998	978.5	.1
Surface Water	JUN 1998	985.2	.1
Surface Water	JUL 1998	0	.1
Surface Water	AUG 1998	0	.1
Surface Water	SEP 1998	0	.2
Surface Water	OCT 1998	0	.1
Surface Water	NOV 1998	0	.05
Surface Water	DEC 1998	879.9	.2

Source Water (Untreated) Lev els of Giardia for Meramec Plant

Water Type	Month	Giardia Level (#cysts/100L)	Volume Analyzed
Surface Water	JUL 1997	NO DATA	NO DATA
Surface Water	AUG 1997	0	2
Surface Water	SEP 1997	0	1
Surface Water	OCT 1997	0	.4
Surface Water	NOV 1997	293.5	1
Surface Water	DEC 1997	0	6
Surface Water	JAN 1998	0	.4
Surface Water	FEB 1998	188.7	1
Surface Water	MAR 1998	0	.4
Surface Water	APR 1998	456.8	.2
Surface Water	MAY 1998	141.5	.7
Surface Water	JUN 1998	0	.3
Surface Water	JUL 1998	0	.5
Surface Water	AUG 1998	0	.1
Surface Water	SEP 1998	0	.8
Surface Water	OCT 1998	0	.3
Surface Water	NOV 1998	391.4	.3
Surface Water	DEC 1998	97.85	2

Source Water (Untreated) Levels of Giardia for South County Plant

Water Type	Month	Giardia Level (#cysts/100L)	Volume Analyzed
Surface Water	JUL 1997	NO DATA	NO DATA
Surface Water	AUG 1997	0	.4
Surface Water	SEP 1997	0	.8
Surface Water	OCT 1997	652.3	2
Surface Water	NOV 1997	293.5	4
Surface Water	DEC 1997	412.4	14
Surface Water	JAN 1998	293.5	2
Surface Water	FEB 1998	283	2
Surface Water	MAR 1998	0	.4
Surface Water	APR 1998	0	1
Surface Water	MAY 1998	251.6	.8
Surface Water	JUN 1998	0	.3
Surface Water	JUL 1998	0	.3
Surface Water	AUG 1998	0	.3
Surface Water	SEP 1998	125.8	.8
Surface Water	OCT 1998	235.8	.4
Surface Water	NOV 1998	183.5	2
Surface Water	DEC 1998	195.7	2

Source Water (Untreated) Levels of Giardia for Central Plant 3A & 3B

NO DATA - Click here to find out why.

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

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
Feb 1998	view report	view report
Mar 1998	view report	view report
Apr 1998	view report	view report
May 1998	view report	view report
Jun 1998	view report	view report
Jul 1998	view report	view report
Aug 1998	view report	view report
Sep 1998	view report	view report
Oct 1998	view report	view report
Nov 1998	view report	view report
Dec 1998	view report	view report

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