[Report of the Medical Officer of Health for Waltham Forest] page 106

Waltham Forest 1969

[Report of the Medical Officer of Health for Waltham Forest]

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Table: BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1969OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1969OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

Source of supply	BEFORE TREATMENT							AFTER TREATMENT
		Agar plate count per ml.		Coliform count		Escherichia coli count			Agar plate count per ml.		Coliform count	E. coli count
	Number of samples	20-24 hours at 37° C.	3 days at 22° C.	Per cent. samples negative in 100 ml.	Count per 100 ml.	Per cent. samples negative in 100 ml.	Count per 100 ml.	Number of samples	20-24 hours at 37° C.	3 days at 22° C.	Per cent. samples negative in 100 ml.	Per cent. samples negative in 100 ml.
Lee Bridge (Lee-derived)	2,675	203.5	-	40.67	9.3	60.34	2.3	495	52.0	-	99.60	99.80
Ferry Lane	77	0.3	-	98.70	-	100.0	-	79	7.1	-	100.0	100.0
Chingford Mill	250	0.4	8	100.0	-	100.0	-	250	0.3	4	100.0	100.0
Thames-derived, North of River	8. 196	66.5	-	39.79	19.0	53.97	7.0	3,698	12.9	-	99.89	100.0
Coppermill	308	130.8	-	45.13	14.7	68.51	1.6	127	43.5	-	100.0	100.0
*Mixed with filtered River Lee - derived water before chlorination

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