[Report of the Medical Officer of Health for Bromley] page 120

Bromley 1970

[Report of the Medical Officer of Health for Bromley]

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BACTERIOLOGICAL RESULTS—YEARLY AVERAGES, 1970 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
		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	8,259	31.9	-	37.91	17.3		53.58	4.7	3,710	8.0		99.92	99.97
		Merton Abbey	8	0.1	3	100.0	—		100.0	—	8	0.0	3	100.0	100.0
		Eynsford Well	175	0.0	7	99.43	—		100.0	-	252	0.1	8	100.0	100.0
		Eynsford Borehole	195	0.0	1	100.0	—		100.0	-	252	0.1	8	100.0	100.0
Horton Kirby No. 1	138	0.1	68	97.83	—	100.0	-	253	0.0	5	100.0	100.0
Horton Kirby No. 2	193	0.0	15	99.48	—	99.48	-	253	0.0	5	100.0	100.0
Jewels Wood	89	0.1	18	98.88	—	100.0	-	90	3.5	14	100.0	100.0
Lullingstone No. 1	135	0.0	2	100.0	—	100.0	-	253	0.0	21	100.0	100.0
Lullingstone No. 2	177	0.0	3	100.0	—	100.0	-	253	0.0	21	100.0	100.0
North Orpington No. 1	187	1.9	26	10.70	26.5	24.60	7.7	250	1.3	7	99.60	99.60
North Orpington No. 2	194	14.2	23	16.49	13.5	34.54	4.1	250	1.3	7	99.60	99.60
Orpington	247	0.1	7	99.19	—	99.60	-	252	0.0	8	100.0	100.0
Shortlands No. 1	188	0.1	12	98.46	—	99.47	-	252	0.0	3	100.0	100.0
Shortlands No. 2	145	0.0	3	99.31	—	100.0	-
Shortlands No. 3	142	0.1	110	99.30	—	100.0	-
Sundridge No. 1	108	0.0	7	98.15	0.1	100.0	-	252	0.0	91	100.0	100.0
Sundridge No. 2	153	0.0	7	99.35	_	100.0	-
Sundridge No. 3	209	0.0	15	99.04	—	100.0	-
Sundridge No. 4	184	0.6	31	98.91	0.4	100.0	-
West Wickham	73	0.4	127	97.26	0.1	100.0	-	74	0.0	626	100.0	100.0