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
Orpington 1954
[Report of the Medical Officer of Health for Orpington]
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26
Average Results of the Chemical and Bac teriological Examination of the Water
Supplied to Orpington Urban District Council during 1954.
Average Results of the Chemical and Bac teriological Examination of the Water Supplied to Orpington Urban District Council during 1954.
(Parts per million, unless otherwise stated).
| Description of Samples. | No. of Samples. | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen Nitrate | Chlorides as Cl. | Oxygen abs. from Permanganate 4 hrs. at 27°C. | Turbidity in terms of Silica | Colour m.m. brown 2ft. tube Burgess's Tintometer. | Hardness (Total) | Hardness Non-Carbonate | pH Value | Phosphate as PO. 4 | Silica SiO 2 | Sulphates SO4 | Magnesium Oxygen Saturation % Mg. | Conductivity. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Orpington Well | 4 | 0.003 | 0.020 | 6.1 | 15.4 | 0.10 | Nil | Nil | 276 | 48 | 7.1 | 0.08 | 14 | 14 | 2.5 | 400 |
| N. Orpington Well | 4 | 0.004 | 0.019 | 4.6 | 13.8 | 0.08 | 0.3 | 2 | 265 | 41 | 7.1 | 0.07 | 15 | 8 | 2.5 | 375 |
| Jewels Wood Well | 3 | 0.003 | 0.018 | 3.1 | 11.2 | 0.07 | Nil | Nil | 247 | 41 | 7.2 | 0.07 | 12 | 12 | 2.5 | 375 |
| Sundridge Well | 4 | 0.004 | 0.024 | 2.4 | 16.5 | 0.08 | Nil | Nil | 206 | 43 | 7.5 | 0.19 | 18 | 21 | 3.3 | 325 |
| Eynsford Well | 4 | 0.003 | 0.025 | 3.6 | 14.6 | 0.05 | Nil | Nil | 260 | 39 | 7.2 | 0.06 | 14 | 10 | 2.6 | 400 |
| Shortlands Well | 4 | 0.004 | 0.024 | 5.4 | 18.5 | 0.14 | Nil | Nil | 287 | 74 | 7.2 | 0.07 | 18 | 43 | 3.9 | 425 |
| Bexley Well | 3 | 0.007 | 0.025 | 4.8 | 16.0 | 0.13 | Nil | Nil | 282 | 53 | 7.2 | 0.05 | 18 | 24 | 3.5 | 425 |
Bacteriological Results.
Bacteriological Results.
| Number of samples. | Before Chlorination (Raw Water). After Clorination | (Water passing into Supply). | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Plate count (average per millilitre) Colonies counted on Agar | Bact. coli test | Number of samples. | Plate count (Av. per ml.) Colonies counted on Agar 37°C. 20-24 hrs. | Bact. coli test | |||||
| 22°C. 3 days | 37°C. 20-24 hrs. | Percentage samples neg. 100 ml. | Average No. per 100 ml. | Percentage samples neg. 100 ml. | Average No. per 100 ml. | ||||
| Orpington Well | 246 | 1478.7 | 101.0 | 100.0 | Nil | 257 | 0.1 | 100.0 | Nil |
| N. Orpington Well | 231 | 42.0 | 4.6 | 22.9 | 11.70 | 235 | — | 100.0 | Nil |
| Jewels Wood Well | 202 | 2.2 | 0.1 | 99.0 | 0.02 | 204 | — | 100.0 | Nil |
| Sundridge Well | 319 | 22.8 | 0.1 | 100.0 | Nil | 257 | — | 100.0 | Nil |
| Eynsford Well | 257 | 18.4 | 0.1 | 100.0 | Nil | 265 | — | 100.0 | Nil |
| Shortlands Well | 504 | 2.1 | 0.2 | 100.0 | Nil | 257 | — | 100.0 | Nil |
| Bexley Well | 572 | 5.6 | 0.1 | 100.0 | Nil | 306 | — | 100.0 | Nil |