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 1961
[Report of the Medical Officer of Health for Orpington]
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Average Results of the Chemical Examination of the Water supplied to Orpington during the Year 1961.
Milligrammes per litre (unless otherwise stated).
| Description of the Sample | No. of Samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as CI. | Oxygen abs. from Permanganate 4 hrs. at 27°C. | Turbidity units | |
|---|---|---|---|---|---|---|---|---|
| Nitrite | Nitrate | |||||||
| Eynsford well | 8 | 0.022 | 0.031 | 4.1 | 16 | 0.04 | Nil | |
| Horton Kirby well | 8 | 0.021 | 0.039 | 4.8 | 17 | 0.08 | Nil | |
| Lullingstone well | 8 | 0.017 | 0.032 | 4.3 | 14 | 0.02 | 0.2 | |
| North Orpington well | 5 | 0.017 | 0.037 | 4.7 | 14 | 0.08 | 0.1 | |
| Orpington well | 4 | 0.018 | 0.040 | 6.8 | 18 | 0.18 | Nil | |
| Sundridge well | 9 | 0.020 | 0.033 | 3.0 | 18 | 0.12 | 0.1 | |
Continued from previous table
| Description of sample | Colour, mm. brown 2 ft. Tube Burgess,s Tintometer | Hardness (non carbonate) | pH value | Phosphate as PO4 | Silicate as SiO2 | pH value | Free CO | B.O.D 5 days at 20 C0 | Electrical conductivity(micromhos) |
|---|---|---|---|---|---|---|---|---|---|
| Eynsford well | Nil | 270 | 30 | 7.2 | 32 | 475 | |||
| Horton Kirby well | Nil | 260 | 32 | 7.2 | 31 | 500 | |||
| Lullingstone well | 1 | 256 | 24 | 7.2 | 30 | 450 | |||
| North Orpington well | Nil | 274 | 28 | 7.2 | 40 | 500 | |||
| Orpington well | Nil | 300 | 60 | 7.2 | 38 | 550 | |||
| Sundridge well | Nil | 210 | 36 | 7.4 | 14 | 400 |