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
Lewisham 1953
[Report of the Medical Officer of Health for Lewisham Borough]
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Average results of the examination of the water supply to the Borough of Lewisham for 1953
parts per million (unless otherwise stated)
(
| Description of the sample | No. of samples | Ammoniacal nitrogen | Albuminoid nitrogen | Oxidised nitrogen (nitrate) | Chlorides as CI. | Oxygen abs. from permanganate (4 hrs. at 27°C) | Hardness (total) | Hardness (non. carbonate) | pH value | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|
| Bexley Well | 4 | 0.005 | 0.021 | 4.8 | 16.1 | 0.06 | 284 | 54 | 7.3 | 450 |
| Darenth Well | 4 | Nil | 0.018 | 4.9 | 15.1 | 0.10 | 264 | 34 | 7.2 | 450 |
| Shortlands Well | 8 | 0.003 | 0.022 | 4.7 | 15.5 | 0.12 | 283 | 68 | 7.2 | 500 |
| Wilmington Well | 8 | 0.007 | 0.023 | 6.8 | 19.7 | 0.12 | 293 | 59 | 7.2 | 500 |
| River Thames.derived filtered water | 1766 | 0.012 | 0.081 | 3.3 | 26.8 | 1.02 | 259 | 64 | 7.9 | 500 |
(
| No. of samples | Agar colony count (average per millilitre) | Percentage of samples negative to Bact. coIi in 100 ml. | Bact. coli per 100 ml. | ||
|---|---|---|---|---|---|
| 22° C 3 days | 37°C (20.24 hrs.) | ||||
| Bexley Well | 309 | 0.7 | 0.2 | 100.0 | Nil |
| Darenth Well | 253 | 1.8 | 0.6 | 100.0 | Nil |
| Shortlands Well | 253 | - | - | 1000 | Nil |
| Wilmington Well | 251 | 38.0 | 0.8 | 100.0 | Nil |
| River Thames.derived filtered water | 3488 | - | 13.5 | 99.9 | 0.001 |