[Report of the Medical Officer of Health for Haringey] page 13

Haringey 1972

[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 1972

Average Chemical Results (Miligrams per litre (unless otherwise stated))

Description of the Sample	No. of samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Chlorides as a	Oxygen abs. from Permanganate 4 hrs at 27°C	Turbidity Units	Colour (Burgess Units)	Hardness (Total) CaC0₃	Hardness (non carbonate) CaC0₃	PH Value	Phosphate as PO₄	Silicate as Si0₂	Sulphate SO4	Natural Fluoride as F	Magnes ium as Mg	Sodium as Na	Potassium as K	Surface Active Material as Manoxol OT	Electrical Conductivity (micro-mpos)
New River derived	104	0.014	0.050	7.9	42	0.70	0.1	9	308	80	7.8	2.1	10	52	0.15	5.5	28.8	5.1	0.02	640
Thames derived	364	0.031	0.069	6.9	35	1.06	0.1	13	274	82	7.9	2.8	10	58	0.15	5.0	24.5	5.5	0.02	570

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Average Bacteriological Results

Description of the Sample	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	Escherichia 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.
New River derived	1.506	58.8	000	55.91	4.2	70.25	1.1	510	20.1	000	100.00	100.00
Thames derived	8,087	42.3	000	41.94	10.2	56.76	4.0	3.891	10.0	000	99.85	99.97