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

Haringey 1970

[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 1970

(Milligrams per litre (unless otherwise stated))

Description of the Sample	No. of samples	Ammoniacal Nitrogen	Albuminoid Nitrogen	Nitrate Nitrogen	Chlorides as CI	Oxygen abs. from Permanganate 4 hrs. at 27° C	Turbidity Units	Colour (Burgess Units)	Hardness (Total) Ca C0₃	Hardness (non-carbonate) Ca C0₃	pH Value	Phosphate as ^PO4	Silicate as sio₂	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	0.008	0.061	5.2	45	0.61	0.0	8	304	79	7.8	1.9	10	71	0.20	5	30.9	4.9	0.02	620
Thames derived	363	0.026	0.083	4.8	40	1.02	0.1	11	274	79	7.9	2.7	9	70	0.20	5	27.7	5.6	0.03	570
Park Well	3	0.135	0.025	0.4	24	0.19	0.1	2	276	68	7.5	-	-	-	0.65	-	-	-	-	510

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES 1970

	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 370 c	3 days at 22° C	Per cent samples negative in 100 ml.	Per cent samples negative in 100 ml.
New River derived	1,510	46.1	-	42.91	8.1	60.79	2.2	516	10.9	-	100.0	100.0
Thames derived	8,259	31.9	-	37.91	17.3	53.58	4.7	3,710	8.0	.	99.92	99.97
Park Well	95	0.4	31	93.68	0.1	100.0	-	96	0.5	15	100.0	100.0