[Report of the Medical Officer of Health for Lewisham Borough] page 104

Lewisham 1971

[Report of the Medical Officer of Health for Lewisham Borough]

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Table: Table 73BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1971 WATER SUPPLIES TO THE LONDON BOROUGH OF LEWISHAM

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Table 73

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1971 WATER SUPPLIES TO THE LONDON BOROUGH OF LEWISHAM

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.
River Thames—Derived	8,154	53.9	—	40.37	12.2	54.91	51	3,901	8.4	—	99.51	99.97
Bexley	263	0.1	8	100.0	—	100.0	—	254	0.1	12	100.0	100.0
Deptford	214	3.4	52	99.07	0.1	99.53	—	216	0.1	18	100.0	100.0
Darenth	250	0.0	14	99.20	—	100.0	—	256	0.0	4	100.0	100.0
Wilmington	248	0.8	74	97.18	0.2	100.0	—	245	0.3	13	99.18	100.0