[Report of the Medical Officer of Health for London, City of ] page 5

City of London 1965

[Report of the Medical Officer of Health for London, City of ]

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METROPOLITAN WATER BOARD — Water Examination Department

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1965

CITY OF LONDON

Source of Supply	BEFORE TREATMENT AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		Escherichia coli count			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.
All Thames-Derived								3,888	7.3		99.92	100.0
Stoke Newington								257	6.5		100.0	100.0

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METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT

RESULTS OF THE CHEMICAL EXAMINATION OF RIVERS AND FILTERED WATER STATION FOR 1965

Description of the Sample	Number of Samples Day of the month	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Oxygen abs. from KMn04 4 hrs at 27° C.	B.O.D. 5 days at 20° C.	Hardness (total) CaC03	Hardness (non-carbonate CaC03)	Magnesium as Mg			Chloride as CI	Phosphate as P04	Silicate as Si02	Sulphate as S04	Natural Fluoride as F	Surface-active material as Manoxol OT		Turbidity units	Colour (Burgess units)	PH value	Electrical Conductivity (micromhos)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)	(16)	(17)	(18)	(19)	(20)	(21)	(22)	(23)
All Thames-derived	363	0.049	0.091	4.3	1.20		264	68	4			41	1.9	10	64	0.25	0.10		0.1	15	7.6	560
Stoke Newington	52	0.050	0.068	5.6	0.72		300	66	5			42	1.5	12	60	0.25	0.07		0.1	8	7.8	610