[Report of the Medical Officer of Health for Orpington] page 32

Orpington 1960

[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 1960.

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.
Eynsford No. 1 well	197	-	74	71.07	1.2	96.95	0.1	256	0.1	12	99.61	100
Eynsford No. 2 well	140	-	3	98.57	-	100	-	256	0.1	12	99.61	100
Horton Kirby No. 1 well	216	0.2	105	92.13	0.7	95.37	0.4	246	0.2	75	99.59	100
Horton Kirby No. 2 well	150	0.3	14	98.67	-	100	-	246	0.2	75	99.59	100
Lullingstone No. 1 well	84	0.1	93	98 81	_	100	_	212	0.2	73	99.53	100
Lullingstone No. 2 well	62	0.2	61	100	-	100	-	212	0.2	73	99.53	100
Orpington well	247	0.1	38	88.26	0.2	100	-	253	0.1	8	99-60	100
North Orpington well	226	59.4	437	7.96	134.4	20.35	50.3	229	3.1	10	99.13	99.56
Shortlands No. 1 well	74	0.1	1	100	—	100	—	257	0.1	19	100	100
Shortlands No. 2 well	201	-	1	99.50	0.1	100	-
Shortlands No. 3 well	226	1.0	25	99.12	—	100	-
Sundridge No. 2 well	203	0.4	10	100	-	100	-	253	0.1	2	100	100
Sundridge No. 4 well	120	0.1	18	100	-	100	-	253	0.1	2	100	100
Thames derived	—	—	—	—	—	—	-	1,874	8.6	—	99.57	100
(Southern Group)								1,874	8.6	—	99.57	100