[Report of the Medical Officer of Health for Tottenham] page 12

Tottenham 1960

[Report of the Medical Officer of Health for Tottenham]

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AVERAGE RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLIED

TO THE BOROUGH OF TOTTENHAM FOR THE YEAR 1960

(Milligrams per litre (unless otherwise stated))

Description of the Sample	No of samples	Amnonia Nitrogen	Album inoid Nitrogen	Oxidised Nitrogen (Nitrate)	Chlorides as C1	Oxygen abs. from Permanganate 4 hrs. at 27°c.	Turbidity in terms of Silica	Colour m m. brown 2ft. Tube Burgess's Tintometer	Hardness (Total)	Hardness (non-carbonate)	pH Value	Phosphate as PO₄	Silicate as sio₂	Sulphate as so₄	Fluoride as F	Magnesium as Mg	Surface Active Material as Manoxol	Free CO 2	Electrical Conductivity (gemmhos)
New River derived	104	0.024	0.058	5.5	33	0.64	0.1	6	298	80	7.8	0.50	11	70	0.25	5	0.10		625
RiverThamesderived(AshfordCommonGroup)	207	0.024	0.082	4.0	28	1.22	0.4	13	264	66	7.9	0.95	9	58	0.25	4	0.12		550
Park well	2	0.155	0.032	0.1	22	0.22	1.0	11	256	46	7.3			62	0.70			18

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BACTERIOLOGICAL RESULTS-YEARLY AVERAGES. 1960

	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 of 22°C.	Per cent samples negative in 100 ml.	Per cent samples negative in 100 ml.
New River derived								515	5.2		99.42	100
River Thames derived (Ashford Common Group)								1778	14.4		98.71	100
Park well	139	0.2	4	88.49	0.8	97.84	0.1	142	0.1	2	99.30	100