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 1954
[Report of the Medical Officer of Health for Lewisham Borough]
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Average results of the examination of the chemical and bacteriological water supply to the Borough of Lewisham parts per million (unless otherwise stated)
(o) CHEMICAL Table 19 for 1954
| 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 | 3. | 0 .007 | 0.025 | 4.8 | 16.0 | 0.13 | 282 | 53 | 7.2 | 425 |
| Darenth Well | 4 | 0.003 | 0.018 | 5.3 | 15.4 | 0.07 | 265 | 40 | 7.1 | 425 |
| Shortlands Well | 4 | 0.004 | 0.024 | 5.4 | 18.5 | 0.14 | 287 | 74 | 7.2 | 425 |
| Wilmington Well | 8 | 0.006 | 0.025 | 7.2 | 16.6 | 0.11 | 290 | 62 | 7.2 | 450 |
| Deptford Well | 3 | 0.007 | 0.027 | 6.2 | 320 | 0.18 | 357 | 125 | 7.1 | 600 |
| River Thames.derived filtered water | 1585 | 0.021 | 0.092 | 3.9 | 26.7 | 1.20 | 269 | 70 | 7.9 | 450 |
.(b) BACTERIOLOGICAL Table 20
| No. of samples | Agar colony count (average per millilitre) | Percentage of samples negative to Bact. coli in 100 ml. | Bact. coli per 100 ml. | ||
|---|---|---|---|---|---|
| 22 °C 3 days | 37 °C (20.24 hrs.) | ||||
| Bexley Well | 306 | 5.6 | 0.1 | 100.0 | Nil |
| Darenth Well | 236 | 29.8 | 0.8 | 99.6 | 0.008 |
| Shortlands Well | 257 | 2.1 | 0.2 | 100.0 | Nil |
| Wilmington Well | 252 | 51 2 | 0.3 | 99.6 | 0.008 |
| Deptford Well | 254 | 2.2 | 0.1 | 100.0 | Nil |
| River Thames.derived filtered water | 3604 | 8.8 | 99.8 | 0.004 | |