[Report of the Medical Officer of Health for Orpington] page 38

Orpington 1962

[Report of the Medical Officer of Health for Orpington]

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Result of the Bacteriological Examination of the Water supplied to Orpington doling the Year 1962.

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
	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.
Sundridge No. 1 ......	61	0.0	3	100.0	–	100.0	–	206	0.1	10	99.51	100.0
Sundridge No. 2 ......	71	0.0	1	97.18	0.1	98.59	–
Sundridge No. 3 ...	97	0.1	10	100.0	–	100.0	–
Sundridge No. 4 ...	91	0.0	7	96.70	0.1	100.0	–
Lullingstone No. 1	120	0.0	6	97.50	0.1	100.0	–	250	0.1	4	100.0	100.0
Lullingstone No. 2	139	0.1	7	100.0	–	100.0	–	250	0.1	4	100.0	100.0
Eynsford No. 1 ......	219	0.3	70	89.50	0.5	99.54	–	254	0.0	4	100.0	100.0
Eynsford No. 2	137	0.0	4	99.27	–	100.0	–	254	0.0	4	100.0	100.0
Horton Kirby No. 1	163	0.5	27	98.16	–	98.77	–	256	0.0	109	100.0	100.0
Horton Kirby No. 2	221	0.0	1	100.0	–	100.0	–	256	0.0	109	100.0	100.0
Orpington ...	243	0.2	11	98.77	–	99.59	–	248	0.5	35	99.60	100.0
North Orpington No. 1 ...	202	2.6	200	21.78	17.9	40.10	3.3	256	0.6	19	100.0	100.0
North Orpington No. 2 ...	69	4.8	399	21.74	15.1	55.07	2-4	256	0.6	19	100.0	100.0