[Report of the Medical Officer of Health for Greenwich Borough] page 212

Greenwich 1966

[Report of the Medical Officer of Health for Greenwich Borough]

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Water Supply to the London Borough of GreenwichMETROPOLITAN WATER BOARD—Water Examination Department

Bacteriological Results—Yearly Average 1966

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.
Hampton								1,136	11.4		99.82	100.00
Surbiton								432	3.8		99.54	99.77
Deptford	248	2.6	28	91.53	1.8	96.77	0.1	254	3.1	216	100.00	100.00
Wilmington	248	1.4	29	96.77	0.1	98.79	—	255	0.2	3	100.00	100.00
Darenth	248	0.3	67	97.18	0.1	98.79	—	254	0.0	1	100.00	100.00
Bexley	248	0.0	2	99.60	—	100.00	—	255	0.0	19	100.00	100.00
(a) Wansunt No. 1	178	0.0	108	100.00	-	100.00	-	184	0.0	127	100.00	100.00
(b) „ No. 2	175	0.0	81	99.43	—	100.00	-	184	0.0	127	100.00	100.00
(a) Crayford No. 1	87	0.0	16	100.00	—	100.00	-	255	0.1	1	100.00	100.00
(b) „ No. 2	138	0.0	12	100.00	—	100.00	-
(c) „ No. 3	110	0.0	10	100.00	-	100.00	-