[Report of the Medical Officer of Health for Chislehurst] page 60

Chislehurst 1961

[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 during1961

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

1961

	Southern Group	Bexley Well	Darenth Well	Eynsford No. 1	Eynsford No. 2	Source of Supply			Short-lands No. 1	Short-lands No. 2	Short-lands No. 3	Wilmington No. 2
	Southern Group	Bexley Well	Darenth Well	Eynsford No. 1	Eynsford No. 2	Horton Kirby No. 1	Horton Kirby No. 2	North Orpington	Short-lands No. 1	Short-lands No. 2	Short-lands No. 3	Wilmington No. 2
Number of Samples	—	248	226	154	163	211	151	176	74	108	223	196
Agar plate count per ml. 20-24 hours at 37°C.	—	1.4	_	0.2	_	0.1	0.1	2.5	1.0	0.1	0.1	0.2
3 days at 22°C.	—	147	38	74	4	28	26	26	3	7	9	49
Coliform count Percentage samples negative in 100 ml	—	100	95.58	77.27	99.39	98.10	99.34	22.73	100	100	100	96.94
Count per 100 ml	—	—	0.1	0.9	—	0.2	—	9.6	—	—	—	0.1
Escherichia coli count Percentage samples negative in 100 ml	—	100	99.12	92.21	100.0	99.05	100.0	46.59	100	100	100	100
Count per 100 ml	—	—	—	0.3	—	0.2	—	3.9	—	—	—	—
Number of Samples	1,835	252	231	253		245		181	255			196
Agar plate count per ml. 20-24 hours at 37°C.	10.0	_	0.1	—		0.1		0.3	—			0.1
3 days at 22°C	—	64	718	4		63		6	2			2
Coliform count Percentage samples negative in 100 ml.	99.84	100	100	99.60		100		100	100			100
E. coli count Percentage samples negative in 100 ml	99.89	100	100	100		100		100	100			100