[Report of the Medical Officer of Health for Orpington] page 37

Orpington 1961

[Report of the Medical Officer of Health for Orpington]

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Result of the Bacteriological Examination of the Water supplied to Orpington during the Year 1961.

Parts per million (unless otherwise stated).

BACTERIOLOGICAL RESULTS

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.
		Eynsford No. 1 well	154	0.2	74	77.27	0.9		92.21	0.3	253	—	4	99.60	100.0
		Eynsford No. 2 well	163	__	4	99.39	—		100.0	—	253	—	4	99.60	100.0
		Horton Kirby No. 1 well	211	0 1	28	98.10	0.2		99.05	0.2	245	0 .1	63	100.0	100.0
		Horton Kirby No. 2 well	151	01	26	99.34	—		100.0	—	245	0 .1	63	100.0	100.0
	Lullingstone No. 1 well	132	01	20	100.0	—	100.0	—	401	0 .1	40	99.50	100 .0
Lullingstone No. 2 well	132	0.7	30	100.0	—	100.0	—		401	0 .1	40	99.50	100 .0
North Orpington well	176	2.5	26	22.73	9.6	46.59	3.9	181	0.3	6	100.0	100.0
Orpington well	250	0.2	14	94.00	0.1	100.0	—	255	1.8	22	99.6	99.6
Sundridge No. 1 well	52	0.2	106	100.0	—	100.0	—	225	0.3	149	99.56	100.0
Sundridge No. 2 well	91	0.1	8	100.0	—	100.0	—
Sundridge No. 3 well	110	0.3	93	100.0	—	100.0	—
Sundridge No. 4 well	135	0.1	82	98.52	—	100.0	—