[Report of the Medical Officer of Health for Bromley] page 131

Bromley 1968

[Report of the Medical Officer of Health for Bromley]

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BACTERIOLOGICAL RESULTS—YEARLY AVERAGES, 1968 OF WATER SUPPLIED TO THE LONDON BOROUGH OF BROMLEY

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.
All Thames-derived								3,651	11.4		99.86	99.97
Eynsford well	179	0 0	32	99.88	—	99.44	—	249	0 0	7	100.0	100.0
Eynsford borehole	158	0 0	6	98.73	—	100.0	—	249	0 0	7	100.0	100.0
Horton Kirby No. 1 (a)	189	0 2	231	84.66	2.2	87.83	1.0	249	0.2	66	100.0	100.0
Horton Kirby No. 2 (b)	216	1 4	32	89.35	1.5	92.13	1.1	249	0.2	66	100.0	100.0
Jewels Wood	3	0 0	3	100 0	—	100.0	—	2	—	—	100.0	100.0
Lullingstone No. 1 (a)	128	0 1	1	100.0	—	100.0	—	243	0.0	14	100.0	100.0
Lullingstone No. 2 (b)	123	0 1	12	99. 19	_	99.19	—	243	0.0	14	100.0	100.0
North Orpington No. 1 (a)	212	4 8	40	20.5	9 0	29.25	4.6	237	0.8	11	100.0	100.0
North Orpington No. 2 (b)	218	3.6	24	28.44	6 9	39.45	4.0	237	0.8	11	100.0	100.0
Orpington	230	0 1	12	99.57	_	99.57	—	231	0.1	7	100.0	100.0
Shortlands No. 1 (a)	121	5 2	54	66.12	4.5	84.30	—	228	0.1	22	100 0	100.0
Shortlands No. 2 (b)	209	0 2	5	93.78	0 4	98.56	—
Shortlands No. 3 (c)	71	0 0	156	100.0		100.0	—
Sundridge No. 1 (a)	74	0 1	3	71.62	_	71.62	—	241	0.1	9	100 0	100.0
Sundridge No. 2 (b)	56	0 2	1	96.43	0.1	96.43	0.1
Sundridge No. 3 (c)	110	0 2	9	95.45	0.1	97.27	0.1
Sundridge No. 4 (d)	90	0 1	12	96.67	0.1	97.78	0.1
West Wickham	240	0 1	15	92.08	1.1	94.17	0.6	250	0.2	10	100.0	100.0