Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Feltham]
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Average Results of Analyses of Metropolitan Water Board Supply. (Parts per million.) Water filtered and chlorinated at Hampton Works:
No. of Samples | .250 |
Ammoniacal Nitrogen | .019 |
Abuminoid Nitrogen | .085 |
Oxidised Nitrogen (Nitrate) | 4.1 |
Chlorides as Cl. | 22.0 |
Oxygen abs. from Permanganate 3 hours at 80°F | 1.21 |
Turbidity in terms of Silica | 0.3 |
Colour m.m. brown 2ft. tube Burgess's Tintometer | 15 |
Hardness Total | 268 |
Hardness (Non-Carbonate) | 63 |
pH Value | 7.9 |
Phosphate AS. P.O. III4 | 0.32 |
Silica as. SIO1 | 11.0 |
Conductivity | 450 |
No of Samples | 766 |
Colony Count on agar at 37°C (20-24 hours) | 19.0 |
BACT. COLI TEST | |
Percentage of samples negative per 100 ml. | 100.0 |
Bact. Coli per 100 ml. | Nil. |
Typical Analysis of South West S.W. Co. Supply.
(Parts per 100,000):
Total solids (dried at 120°C.) | 40.0 |
Combined chlorine (as Cl. | 2.6 |
equivalent to Sodium Chloride (NaCl) | 4.3 |
Nitric nitrogen (Nitrates) | 0.44 |
Nitrous nitrogen (Nitrites) | Nil. |
Ammoniacal nitrogen | 0.0004 |
Albuminoid nitrogen | 0.0078 |
Oxygen absorbed in 4 hours at 27°C. | 0.080 |
Lead or Copper | Nil. |
Temporary hardness (equivalent to CaC03) | 20.0 |
Permanent hardness („ „ „) | 8.0 |
Total hardness („ „ „) | 28.0 |