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
Bexley 1971
[Report of the Medical Officer of Health for Bexley]
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METROPOLITAN WATER BOARD — Water Examination Department
Average results of the chemical examination of Water
supplied to the London Borough of Bexley during 1971
Milligrammes per litre (unless otherwise stated)
| Description of the Sample | Number of Samples | Ammoni- acal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs.from KMn04 4 hrs.at 27°C. | B.O.D. 5 days at 20°C | Hardness (total) CaC03 | Hardness non carbon ate CaC03 | Magnesium as Mg | Sodium as Na | Potassium as K |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) |
| River Thames — Derived | 364 | 0.029 | 0.084 | 6.1 | 1.04 | 281 | 90 | 5 | 23.5 | 5.1 | |
| Bexley | 5 | 0.011 | 0.019 | 6.0 | 0.09 | 308 | 74 | ||||
| (a) Crayford No.1 | 4 | 0.007 | 0.033 | 8.8 | 0.23 | 388 | 143 | ||||
| (b) Crayford No.2 | 4 | 0.010 | 0.020 | 7.3 | 0.09 | 292 | 70 | ||||
| (c) Crayford No.3 | 4 | 0.007 | 0.023 | 8.5 | 0.24 | 347 | 110 | ||||
| Darenth | 4 | 0.009 | 0.021 | 6.2 | 0.11 | 285 | 60 | ||||
| Eynsford | 8 | 0.009 | 0.016 | 4.9 | 0.06 | 266 | 52 | ||||
| Horton Kirby | 9 | 0.004 | 0.014 | 5.8 | 0.07 | 268 | 59 | ||||
| Wansunt | 53 | 0.160 | 0.038 | 7.6 | 0.19 | 340 | 99 | ||||
| Wilmington | 4 | 0.020 | 0.029 | 9.0 | 0.19 | 295 | 74 | ||||
| Description of the Sample | Chloride as CI | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electrical Conduct-I ivity (microm-hos) | |
| (1) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
| River Thames - Derived | 34 | 2.3 | 10 | 64 | 0.15 | 0.02 | 0.1 | 13 | 7.8 | 580 | |
| Bexley | 23 | 0.10 | 0.0 | 3 | 7.2 | 570 | |||||
| (a) Crayford No.1 | 35 | 0.10 | 0.0 | 2 | 7.1 | 790 | |||||
| (b) Crayford No.2 | 30 | 0.15 | 0.0 | 1 | 7.2 | 590 | |||||
| (c) Crayford No.3 | 31 | 0.10 | 0.0 | 2 | 7.1 | 670 | |||||
| Darenth | 21 | 0.10 | 0.0 | 1 | 7.2 | 550 | |||||
| Eynsford | 19 | 0.10 | 0.0 | 1 | 7.3 | 500 | |||||
| Horton Kirby | 19 | 0.10 | 0.0 | 0 | 7.3 | 480 | |||||
| Wansunt | 31 | 0.10 | 0.1 | 3 | 7.1 | 690 | |||||
| Wilmington | 28 | 0.15 | 0.0 | 1 | 7.4 | 560 | |||||