[Report of the Medical Officer of Health for Haringey] page 18

Haringey 1968

[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 1968

(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 Perman-ganate 4 hrs. at 27°C	Turbidity Units	Colour (Burgess Units)	Hardness (Total) Ca C0₃	Hardness (non-carbonate) Ca CO₃	PH Value	Phosphate as P0₄	Silicate as Si O₂	Sulphate as so₄	Natural Fluoride as F	Magnesium as Mg.	Sodium as Na	Potassium as K	Surface Active Material as Manoxol OT	Electrical Conductivity (micromhos)
New River derived	104	0.013	0.063	4.8	40	0.67	0.1	7	306	76	7.9	1.7	10	66	0.30	5	29.9	5.2	0.01	630
Park well	13	0.076	0.028	0.8	22	0.28	0.1	0	272	62	7.6				0.75					530
*Thames derived N. of River	207	0.019	0.085	3.8	32	1.19	0.1	14	287	78	8.0	1.9	9	62	0.30	5	23.4	5.2	0.02	570

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1968

	BEFORE TREATMENT							AFTER TREATMENT
	Number of samples	Agar plate count per mI		Coliform count		Escherichia Coli count		Number of samples	Agar plate count per mil.		CoIiform count	Escherichia Coli count
	Number of samples	20-24 hours at 37°C	3 days at 22ºC	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 22ºC	Per cent samples negative in 100 ml.	Per cent samples negative in 100 ml.
New River derived								514	11.9		100.0	100.0
Park well	111	0.3	68	90.99	0.3	94.59	0.1	113	6.9	28	100.0.	100.0
*Thames derived N. of River								1,720	12.1		99.94	99.94
*Ashford Common, Kempton Park, Hanworth and Barn Elms