[Report of the Medical Officer of Health for Greenwich Borough] page 227

Greenwich 1968

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

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Table: METROPOLITAN WATER BOARD—Water Examination Department

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METROPOLITAN WATER BOARD—Water Examination Department

Source of supply	BEFORE TREATMENT							AFTER TREATMENT
		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.
Thames-derived, *South of River								1,931	10.8		99.79	100.0
Bexley Well	246	0.1	3	99.59	—	99 .9	—	250	0.1	6	100.0	100.0
(a) Crayford No. 1	120	0.1	7	95.00	0.3	96.27	0.1	} 250	9.5	66	100.0	100.0
(b) Crayford No. 2	124	0.2	312	94.35	0.3	96.77	0.1
(c) Crayford No. 3	121	0.3	162	93.39	0.6	95.87	04
Deptford Well	219	0.1	98	93.15	0.4	95.43	0.2	223	0.2	98	100.0	100.0
Darenth Well	246	0.1	18	97.15	0.1	97.97	0.1	253	0.0	1	100.0	100.0
(a) Wansunt No. 1	216	0.7	26	98.61	0.1	99.07	—	} 252	0.0	38	100.0	100.0
(b) Wansunt No. 2	244	0.0	16	100.0	—	100.0	—	} 252	0.0	38	100.0	100.0
Wilmington Well	240	1.8	37	89.58	1.0	94.58	0.1	246	0.4	5	100.0	100.0

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*Hampton, Surbiton and Walton.