[Report of the Medical Officer of Health for Bexley] page 94

Bexley 1971

[Report of the Medical Officer of Health for Bexley]

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METROPOLITAN WATER BOARD — Water Examination Department

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1971 OF THE WATER SUPPLIED TO THE LONDON BOROUGH OF BEXLEY

Source of supply	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		Escherichia coli count		Number of samples	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	5.1	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
Crayford No. 1	161	0.0	2	99.38	—	99.38	—	256
Crayford No. 2	153	0.8	53	99.35	0.1	99.35	0.1		0.0	7	100.0	100.0
Crayford No. 3	101	0.0	1	99.01	—	100.0	—
Darenth	250	0.0	14	99.20	—	100.0	—	256	0.0	4	100.0	100.0
(a) Eynsford Well	161	0.0	10	98.14	—	98.14	—	255
(b) Eynsford Borehole	197	0.0	3	99.49	0.1	99.49	0.1	255	0.1	13	100.0	100.0
(a) Horton Kirby No. 1	134	0.0	29	88.81	0.3	95.52	0.1	251
(b) Horton Kirby No. 2	169	0.0	5	98.22	—	98.82	—	251	0.1	3	100.0	100.0
(a) Wansunt Borehole	249	0.1	14	99.60	—	100.0	—	254	1.2	8	100.0	100.0
(b) Wansunt Well	232	6.0	129	99.57	—	99.57	—	254	1.2	8	100.0	100.0
Wilmington	248	0.8	74	97.18	0.2	100.0	—	245	0.3	13	99.18	100.0