[Report of the Medical Officer of Health for Haringey] page 19

Haringey 1969

[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 1969

(Milligrams per litre (unless otherwise stated))

Description of the Sample	No. of samples	Ammoniacal Nitrogen	Album-inoid 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 ^P04	Silicate as Si0₂	Sul ph-ate as ^S04	Natural Fluoride as F	Magne-sium as Mg.	Sodium as Na	Potassium as K	Surface Active Material as Manoxol OT	Elec-tri cal Conductivity (micro-mhos)
New River derived	106	0.012	0.061	4.7	41	0.60	0.1	7	310	83	7.9	1.6	10	68	0.25	5	30.8	5.3	0.02	620
Thames derived	371	0.024	0.083	4.4	32	1.05	0.1	11	282	79	7.9	2.1	9	58	0.25	5	24.0	5.4	0.02	550

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES 1969

	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per mil.		Coliform count		Escherichia Coli count		Number of samples	Agar plate count per miI.		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	1,502	77.6		45.27	10.0	61.78	2.7	514	13.1		100.0	100.0
Thames derived	8,196	66.5		39.79	19.0	53.97	7.0	3,698	12.9		99.89	100.0