[Report of the Medical Officer of Health for Bromley] page 117

Bromley 1971

[Report of the Medical Officer of Health for Bromley]

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Table: BACTERIOLOGICAL RESULTS—YEARLY AVERAGES, 1971 OF WATER SUPPLIED TO THE LONDON BOROUGH OF BROMLEY

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BACTERIOLOGICAL RESULTS—YEARLY AVERAGES, 1971 OF WATER SUPPLIED TO THE LONDON BOROUGH OF BROMLEY

Source of supply	Number of samples	BEFORE TREATMENT				Escherichia coli count		Number of samples	AFTER TREATMENT
		Agar plate count per ml.		Coliform count		Escherichia coli count			Agar plate count per ml.		Coliform count	E. coli count
		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.		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
Eynsford Well	161	0.0	10	98.14	—	98.14	—	255	0.1	13	100.0	100.0
Eynsford Borehole	197	0.0	3	99.49	0.1	99.49	0.1	255	0.1	13	100.0	100.0
Horton Kirby No. 1 Horton Kirby No. 2	134 169	0.0 0.0	29 5	88.81 98.22	0.3	95.52 98.82	0.1	251	0.1	3	100.0	100.0
Lullingstone No. 1	108	0.2	104	100.0	—	100.0	—	250	0.0	35	99.60	100.0
Lullingstone No. 2	158	0.0	9	98.73	—	98.73	—	250	0.0	35	99.60	100.0
	218	4.5	85	12.84	18.3	31.65	5.3	254	1.1	23	99.61	99.61
	169	4.8	79	17.16	22.8	39.64	6.3	254	1.1	23	99.61	99.61
Orpington	251	0.2	5	98.41		99.60	—	254	0.1	3	100.0	100.0
Shortlands No. 1	153	0.2	44	98.69	—	99.35	—	254	0.0	3	100.0	100.0
Shortlands No. 2	123	0.2	30	96.75	0.1	100.0	—	254	0.0	3	100.0	100.0
	223	0.2	63	100.0	—	100.0	—
Sundridge No. 1	157	4.5	60	99.36	—	99.36	—
Sundridge No. 2	187	0.5	335	99.47	—	100.0	—	255	0.2	230	100.0	100.0
Sundridge No. 3	199	0.1	513	100.0	—	100.0	—
Sundridge No. 4	184	1.3	382	100.0	—	100.0	—
West Wickham	114	1.4	132	96.49	0.1	100.0		116	0.0	47	100.0	100.0