[Report of the Medical Officer of Health for Chislehurst] page 62

Chislehurst 1962

[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 during1962

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

1962

Before Treatment		River Thames		Darenth Well	Eynsford No. 1	Eynsford No. 2	Source of Supply
		River Thames					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 No. 2
		Southern Group	Bexley Well
		Number of Samples														251	250	219	137	163	221	202	69	58	74	239	246
Agar plate count per ml. 20-24 hours at 37°C.			0.1		0.3	_	0.5		2.6	4.8	_	_	_	0.1
3 days at 22°C.		—	44	129	70	4	27	1	200	399	1	1	1	42
Coliform count Percentage samples negative in 100 ml			98.41	96	89.5	99.27	98.16	100	21.78	21.74	100	98.65	99.58	94.31
Count per 100 ml. ...		—	0.4	0.1	0.5	—	—	—	17.9	15.1	—	—	—	0.9
Escherichia coli count Percentage samples negative in 100 ml			98.8	99.2	99.54	100	98.77	100	40.1	55.07	100	98.65	99.58	97.15
Count per 100 ml		_	—	—	—	—	.—	—	3.3	2.4	—	_	_	0.1
After Treatment
Number of Samples		1,889	256	253	254		256		256		254		251
Agar plate count per ml. 20-24 hours at 37°C.		11.5		0.2	—		—		0.6		—		13
3 days at 22°C.		—	10	6	4		109		19		9		375
Coliform count Percentage samples negative in 100 ml		99.79	100	99.6	100		100		100		100		98.41
E. coli count Percentage samples negative in 100 ml		99.95	100	100	100		100		100		100		100