[Report of the Medical Officer of Health for Tottenham] page 30

Tottenham 1954

[Report of the Medical Officer of Health for Tottenham]

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Average Results of the Chemical and Bacteriological Examinations of the Water Supplied to the Borough of Tottenham

for the Year 1954 Parts per Million (Unless otherwise stated)

Description of the Sample	No. of Samples	Amnion-iacal Nitrogen	Albuminoid 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 P.O. 111 4	Silica as Si0₂		Magneslum Mg.	Sulphate as so₄	Conductivity
New River water filtered at Hornsey works	225	0.033	0.073		6.2		36.4	0.73	0.2	7		307	80	7.7	1.04	13		5.2	53	550
New River water filtered at Stoke Newington works	225	0.036	0.076		6.2		36.6	0.76	0.2	8		305	79	7.8	1.01	13		5.2	53	550
River Thames derived filtered water	1,585	0.021	0.092		3.9		26.7	1.20	0.3	12,		269	70	7.9	0.65	11		5.0	50	450
Bacteriological Results
Description of Sample				No. of Samples		No. of microbes per ml Colonies counted on agar after 20-24 hrs at 37°C.					Bact. coli Test
Description of Sample				No. of Samples							Percentage of samples negative to Bact. coli in 100 ml.						Bact. coli per 100 ml.
New River water filtered at Hornsey				257		12.6					100. 0						Nil
New River water filtered at Stoke Newington works				258		13.7					100.0						Nil
River Thames derived filtered water				3,604		8.8					99. 8						0.004