[Report of the Medical Officer of Health for Waltham Forest] page 61

Waltham Forest 1972

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

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1972 OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

Source of supply	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		Eschericia coli count			Agar plate count per ml.		Col iform 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.
Chingford Mill	251	0.2	12	99.60	-	100.0	-	251	0.1	13	100.0	100.0
Thames-derived	8,087	42.3		41.94	10.2	56.76	4.0	3,891	10.0		99.85	99.97
Coppermills	994	82.2		41.65	17.2	61.89	2.6	255	9.4		100.0	100.0