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 1952
[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 1952
parts per million (unless otherwise stated)
v. ii-i ii
Table 19
| Description of the sample | No. of samples | Ammoniacal nitrogen | Albuminoid nitrogen | Oxidised nitrogen (nitrate) | Chlorides as CI. | Oxygen abs. from permanganate (3 hrs. at 2TC) | Hardness (total) | Hardness (non-carbonate) | pH value | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|
| Wilmington well | 8 | 0.013 | 0.026 | 7.3 | 19.5 | 0.12 | 291 | 54 | 7.2 | 475 |
| Darenth well | 0.013 | 0.025 | 5.3 | 14.8 | 0.08 | 254 | 29 | 7.3 | 425 | |
| Bexley well | 5 | 0.011 | 0.037 | 6.2 | 16.1 | 0.07 | 282 | 50 | 7.3 | 475 |
| Shortlands well | 4 | 0.007 | 0025 | 5.4 | 18.6 | 0.19 | 282 | 61 | 7.4 | 450 |
| Deptford well | 4 | 0.021 | 0.033 | 7.7 | 34.4 | 0.15 | 343 | 107 | 7.2 | 650 |
| River Thames filtered water | 1714 | 0027 | 0093 | 24.6 | 1.05 | 256 | 62 | 7.8 | 475 |
| 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.) | ||||
| Wilmington well | 255 | 33.3 | 1.2 | 100.0 | nil |
| Darenth well ... | 251 | 1.2 | 0.1 | 99.6 | 0.004 |
| Bexley well ... | 261 | 10.9 | 0.6 | 100.0 | nil |
| Shortlands well | 273 | 5.7 | 0.5 | 100.0 | nil |
| Deptford well | 269 | 136.0 | 16.0 | 99.3 | 0.011 |
| River Thames filtered water | 3430 | — | 17.5 | 99.8 | 0.005 |