[Report of the Medical Officer of Health for Chislehurst] page 55

Chislehurst 1960

[Report of the Medical Officer of Health for Chislehurst]

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Table: Average Results of the Bacteriological Examination of the water supplied to the Urban District of Chisieharst and Sidcnp during1960

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Average Results of the Bacteriological Examination of the water supplied to the Urban District of Chisieharst and Sidcnp during1960

	Bexley Well	Darenth Well	Eynsford No. 1	Eynsford No. 2	Horton Kirby No. 1	Horton Kirby No. 2	Source ot Supply		Short-lands No. 1	Short-lands No. 2	Short-lands No. 3	Wilmington No. 2	Thames derived
							Orpington	North Orpington
							Number of Samples	245						174	197	140	216	150	247	226	74	201	226	249	-
							Agar plate count per ml.
20-24 hours at 37°C.	0.1	0.1	-	-	0.2	0.3	0.1	59.4	0.1	-	1.0	0.1	-
3 days at 22°C.	101	4	74	3	105	14	38	437	1	1	25	45	-
Coliform count
Percentage samples negative in 100 ml	100	86.21	71.07	98.57	92.13	98.67	88.26	7.96	100	99.50	99.12	94.38	-
Count per 100 ml	-	0.4	1.2	-	0.7	-	0.2	134.4	-	0.1	-	0.1	-
Escherichia coli count
Percentage samples negative in 100 ml	100	93.10	96.95	100	95.37	100	100	20.35	100	100	100	99.20	-
Count per 100 ml	-	0.2	0.1	-	0.4	-	-	50.3	-	-	-	-	-
Number of Samples	249	175	256		246		253	229		257		257	1,874
Agar plate count per ml. 20-24 hours at 37°C.	0.7	0.1	0.1		0.2		0.1	3.1		0.1		-	8.6
3 days at 22°C.	20	151	12		75		8	10		19		11	-
Coliform count Percentage samples negative in 100 ml	99.20	100	99.61		99.59		99.60	99.13		100		99.61	99.57
E. coli count Percentage samples negative in 100 ml	100	100	100		100		100	99.56		100		100	100