London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Feltham 1957
[Report of the Medical Officer of Health for Feltham]
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8
Average Results of Analyses of Metropolitan Water Board
Supply. (Milligrammes per litre). Water filtered and
chlorinated at Hampton Works.
Chemical
| Ammonia Nitrogen | 0.020 |
| Albuminoid Nitrogen | 0.076 |
| Oxidised Nitrogen (Nitrate) | 3.9 |
| Chlorides as C1 | 29 |
| Oxygen abs. from Permanganate 4 hours at 27°C. | 1.20 |
| Turbidity in terms of Silica | 0.4 |
| Colour m.m. brown 2 ft. tube Burgess's Tintometer | 12 |
| Hardness total | 260 |
| Hardness (Non-carbonate) | 58 |
| pH Value | 7.9 |
| Conductivity | 550 |
Bacteriological
Plate counts (average per ml.)
Colonies counted on agar at 37°C. (20—24 hours) 3.7
Colonies counted on agar at 22°C. (3 days) —
Coliform Test (Percentage of samples negative per 100 ml.)
Coliform 99.50
B.Coli 99.75
Typical Analysis of South West S.W. Co., Supply
(Parts per million.)
Chemical
Appearance Bright with
very few
particles.
(Microscopic
mineral
particles)
Turbidity Less than 3
Colour 5
Odour Nil
pH 7.7
Free Carbon Dioxide 7
Electric Conductivity 510
Total Solids 340
Chlorine present as Chloride 28
Alkalinity as Calcium Carbonate 195
Hardness: Total 255
(Carbonate 195; Non-Carbonate 60)
Nitrate Nitrogen 4.7
Nitrite Nitrogen absent
Ammoniacal Nitrogen 0.000
Albuminoid Nitrogen 0.044
Oxygen absorbed 0.80
Residual Chlorine 0.08
Metals absent