[Report of the Medical Officer of Health for Tottenham] page 27

Tottenham 1958

[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 OP TOTTENHAM FOR THE YEAR 1958

(Milligrams per litre (unless otherwise stated))

Description of the Sample	Ammonia 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 PO₄	Silicate as sio₂	Sulphate as SO₄	Fluoride as F	Magnesium as Mg.	Iron	Electrical Conductivity (gemmhos)
New River water filtered at Hornsey and/or Stoke Newington works	0.026	0.054	6.0	32	065	0.1	6	302	78	7.8	0.60	11		0.15			625
River Thames derived filtered water	0.027	0.077	4.2	26	1.26	0.3	12	270	66	7.9	0.85	9	58	0.15	5		550
Park well	0.160	0.029	0.4	22	0.24	1.6	13	252	46	7.5				0.65	18	0.27	500

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BACTERIOLOGICAL RESULTS AFTER CHL0RINATI0N (WATER PASSING INTO SUPPLY)

Description of the Sample	Plate counts (average per ml) Colonies counted on agar		Coliform count Percentage samples negative in 100 ml	Escherichia count Percentage samples negative in 100 ml
Description of the Sample	37°C (20-24 hours)	22°C (3 days)	Coliform count Percentage samples negative in 100 ml	Escherichia count Percentage samples negative in 100 ml
New River water filtered at Hornsey and/or Stoke Newington works	6.0		97. 09	100.0
River Thames derived filtered water	9.7		99.07	99.88
Park well	0.2	5.5	98.05	100.0