[Report of the Medical Officer of Health for Haringey] page 17

Haringey 1966

[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 1966

(Milligrams per litre (unless otherwise stated))

Description of the Sample	No. of samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Chlorides as C1	Oxygen abs. from Permanganate 4 hrs. at 27°C	Turbidity Units	Colour (Burgess Units)	Hard ness (Total) Ca C0₃	Hardness (non-carbonate) Ca C0₃	PH Value	Phosphate as P04	Silicate as Si0₂	Sulphate as so₄	Natural Fluoride as F	Magnesium as Mg.	Sodium as Na	Potassium as K	Surface Active Material as Manoxol OT	Electrical Conductivity (micro-mhos)
New River derived	104	0.027	0.071	5.5	36	0.76	0.1	9	315	83	7.7	1.5	10	64	0.20	4	27.8	4.7	0.01	630
Park well	3	0.145	0.031	0.1	22	0.26	0.2	3	269	58	7.5		14	52		17				520
Thames derived N. of River	207	0.031	0.087	3.9	32	1.26	0.1	15	289	78	7.9	1.6	7	68	0.20	5	24.9	4.9	0.01	570

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1966

	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per ml.		Coliform count		Escherichia coil count		Agar plate count per ml.			Coliform count	Escherichia coiI 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								513	9.6		100.0	100.0
Park well	87	0.4	14	95.40	0.2	100.0	-	87	0.2	14	100.0	100.0
Thames derived N. of River								1,744	17.5		99.71	100.0