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
Bromley 1945
[Report of the Medical Officer of Health for Bromley]
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23
Thames-derived filtered water. All the water is chlorinated as
it leaves the works.
" Bacteriological analyses are made five times per week of
all supplies, and consistently satisfactory results have been
obtained. In the case of the river derived supply, the water is
tested bacteriologically at all stages of purification. All new
and repaired mains are chlorinated before being restored to
use and samples of water from them are tested bacteriologically.
"None of the supplies is plumbo-solvent.
" We have no information with regard to the proportion of
the total number of dwelling-houses in Bromley which are supplied
by the Board, but of these all are supplied direct and not
by means of standpipes.
"Appended are the average results of the chemical and
bacteriological analyses of the various supplies."
Chemical and Bacteriological Examinations, 1945.
| Bacteriological. | No. of samples | Colony Count on Agar at 37° C. | Bact. coli Test |
|---|---|---|---|
| Percentage Bact. coli of samples per 100 ml. negative 100 ml. | |||
| Orpington | 246 | – | 100.0 0.0 |
| West Wickham | 244 | – | 100.0 0.0 |
| Shortlands | 247 | – | 100.0 0.0 |
| Thames derived filtered water (Walton) | 252 | 12.3 | 100.0 0.0 |
Chemical.
| Orpington | West Wickham | Thames-derived filtered water | ||
|---|---|---|---|---|
| Shortlands | (Walton) | |||
| Samples | 5 | 5 | 6 | 245 |
| Ammoniacal Nitrogen | 0.006 | 0.003 | 0.027 | 0.155 |
| Albuminoid Nitrogen | 0.017 | 0.023 | 0.041 | 0.098 |
| Oxidised Nitrogen | 5.1 | 4.3 | 3.5 | 2.9 |
| Chlorides as C1 | 14.7 | 13.8 | 22.7 | 28.4 |
| Oxygen abs. from Permanganate 3 hrs at 80° F. | 0.10 | 0.12 | 0.41 | 1.31 |
| Turbidity in terms of Silica | — | — | — | 1.0 |
| colour, m.m. brown, 2 ft. tube Burgess's Tintometer | 0 | 0 | 2 | 22 |
| Hardness (Total) | 302 | 279 | 287 | 227 |
| Harness (permanent) | 82 | 71 | 107 | 65 |
| PH Value | 7.1 | 7.1 | 7.2 | 7.7 |
| Conductivity | 475 | 425 | 475 | 450 |