[Report of the Medical Officer of Health for Waltham Forest] page 93

Waltham Forest 1966

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

This page requires JavaScript

Copy text to clipboard

- 93 -

Download table as:

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1966

OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

	BEFORE TREATMENT							AFTER TREATMENT
		Agar plate count per ml.		Coliform count		Escherichia coli count			Agar plate count per ml.		Coliform count	E. coli count
Source of supply	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)								513	32.3		98.25	100.0
Ferry Lane								185	11.8		99.46	100.0
Chingford Mill								123	0.4	35	100.0	100.0
Thames-derived, North of River								1,744	17.5		99.71	100.0