[Report of the Medical Officer of Health for Haringey] page 14

Haringey 1965

[Report of the Medical Officer of Health for Haringey]

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AVERAGE RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLIED TO THE LONDON BOROUGH OF HARINGEY FOR THE YEAR 1965

(Milligrams per litre (unless otherwise stated))

Description of the Sample	No. of samples	Ammonia Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Chlorides as C1	Oxygen abs. from Permanganate 4 hrs. at 27°C	Turbidity Units	Colour Burgess Units	Hardness (Total)	Hardness (non-car-bonate)	PH Value	Phosphate as P0₄	Silicate as Si0₂	Sulphate as S0₄	Fluoride as F	Magnesium as Mg.	Surface Active Material as Manoxol	Electri- ical Conductivity (micro-mhos)
New River derived	104	0.053	0.065	5.7	42	0.72	0.1	7	302	66	7.7	1.4	12	60	0.25	5	0.07	610
Park well	3	0.135	0.045	0.1	26	0.26	0.2	3	264	46	7.3				0.7			500
Thames derived N. of River	207	0.060	0.091	4.2	41	1.20	0.1	15	272	68	7.6	1.9	10	64	0.25	4	0.11	570

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1965

	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Conform count		Escherichia coil count		Number of samples	Agar plate count per ml.		Coliform count	Escherichia coil 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.
New River derived								514	6.4	-	100.0	100.0
Park well	62	0.8	62	85.48	0.5	90.32	0.2	63	0.5	38	100.00	100.0
Thames derived N. of River								2046	7.4		99.95	100.0