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
Poplar 1961
[Report of the Medical Officer of Health for Poplar, Metropolitan Borough]
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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE BOROUGH OF POPLAR DURING 1961
MILLIGRAMMES PER LITRE (unless otherwise stated)
| Description of the sample | No. of samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as Cl. | Oxygen abs. from Permanganate 4 hours at 27 C. | Turbidity units | Colour m,m. Brown 2ft. tube Burgess's Tintometer | Hardness (Total) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Nitrate | Nitrite | |||||||||
| Lee Bridge (Lee-derived) | 52 | 0.023 | 0.087 | 4.5 | 40 | 1.10 | 0.2 | 12 | 320 | |
| Thames-derived-Southern Group | 364 | 0.037 | 0.078 | 4.0 | 26 | 1.08 | 0.3 | 13 | 270 | |
| Description of the sample (cont.) | Hardness (non- carbonate) | pH Value as P04 | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Fluoride as F | Magnesium as MG | Surface active material as Manoxol | B. 0. D. 5 days at 20 C. | Electrical Conductivity (gemmhos) |
| Lee Bridge (Lee-derived) | 88 | 8.0 | 1.4 | 8 | 94 | 0. 25 | 7 | 0.15 | 675 | |
| Thames-derived-Southern Group | 52 | 7.9 | 0. 95 | 9 | 50 | 0.20 | 6 | 0.11 | 550 | |
METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1961
| AFTER TREATMENT | Agar plate count per ml. | Coliform count | E. coli count | ||
|---|---|---|---|---|---|
| Source of supply | Number of samples | 20-24 hours at 37 C. | 3 days at 22 C. | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. |
| Lee Bridge (Lee-derived | 515 | 25.0 | 98. 83 | 100.0 | |
| Thames-derived -Southern Group | 3,689 | 14.7 | 99. 86 | 99.92 | |