[Report of the Medical Officer of Health for Chislehurst] page 61

Chislehurst 1963

[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 Chislehurst and Sidcup during 1963

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Average Results of the Bacteriological Examination of the water supplied to the Urban District of Chislehurst and Sidcup during 1963

Before Treatment	Source of Supply
	River Thames		Darenth Well	Eynsford No. 1	Eynsford No. 2	Horton Kirby No. 1	Horton Kirby No. 2	North Orpington No. 1	North Orpington No. 2	Short-lands No. 1	Short-lands No. 2	Short-lands No. 3	Wilmington
	Southern Group	Bexley Well
	Number of Samples	-												251	251	235	122	177	196	159	141	44	79	241	197
Agar plate count per ml. 20-24 hours at 37°C.	-	2.9	-	1.7	0.5	-	-	2.6	1.1	-	-	0.1	0.2
3 days at 22°C.	—	32	10	37	15	79	5	46	57	13	1	3	51
Coliform count Per cent samples negative in 100 ml	-	99.60	99.20	83.40	91.80	96.61	97.96	18.24	34.04	100	100	100	97.97
Count per 100 ml.	-	—	—	0.9	0.3	0.1	0.1	11.5	6.3	—	—	—	—
Escherichia coli count Per cent samples negative in 100 ml	-	100	99.20	99.57	99.18	98.31	98.47	32.70	50.35	100	100	100	99.49
Count per 100 ml	-_	—	—	—	—	0.1	0.1	5	3.6	—	—	—	—
After Treatment Number of Samples	1,873	256	255	247		255		254		253			198
Agar plate count per ml. 20-24 hours at 37°C.	12.5	0.1	-	0.1		-		1.2		0.7			-
3 days at 22°C.	—	4	5	4		15		5		20			45
Coliform count Per cent samples negative in 100 ml	99.41	100	98.43	100		99.22		100		99.21			99.48
E. coli count Per cent samples negative in 100 ml	99.47	100	100	100		100		100		99.21			100