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

Haringey 1971

[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 1971

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) CaCO₃	Hardness (non carbonate) CaCO₃	PH Value	Phosphate as po₄	Silicate as Sio₂	Sulphate so₄	Natural Fluoride as F	Magnesium as Mg.	Sodium as Na	Potassium as K	Surface Active Material as Manoxol OT	Electrical Conductivity (micro-mpos)
New River derived	104	0.017	0.063	6.4	42	0.60	0.1	9	302	84	7.8	1.8	9	62	0.20	5	30.3	5.2	0.02	630
Thames derived	364	0.029	0.084	6.1	34	1.04	0.1	13	281	90	7.8	2.3	10	64	0.15	5	23.5	5.1	0.02	580
Park Well	6	0.162	0.020	Nil	28	0.20	0.1	4	276	71	7.5	—	—	—	0.70	—	—	—	—	560

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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES 1971

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	1,504	82.8	—	40.69	14.2	60.31	2.5	515	14.7	—	100.0	100.0
Thames derived	8,154	53.9	—	40.37	12.2	54.91	5.1	3,901	8.4	—	99.51	99.97
Park Well	100	0.1	100	96.00	0.1	99.00	—	101	0.5	14	99.01	100.0