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
Chislehurst 1949
[Report of the Medical Officer of Health for Chislehurst]
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APPENDIX 5. RESULTS OF THE CHEMICAL BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO CHISLEHURST AND SIDCUP U.D.C. FOR 1949.
| Description of the Sample | No of Samples | Ammo-niacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Clorides as CI. | Oxygen abs. from Permanganate 3 hrs. »t H0° F | Turbidity in termsof Silica | Colour m.m. brown 2ft. tube Burgess Tintometer | Hardness (Total) | Hardness (Permanent) | PH Value | Phosphate as P.O. 'f | Silica | Conductivity | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nitrite | N itra te | ||||||||||||||
| Orpington well | 4 | .000 | .025 | _ | 7.5 | 16.1 | .05 | _ | 0 | 283 | 83 " | 7.1 | — | 450 | |
| North Orpington | 3 | .007 | .022 | — | 4.5 | 15.7 | .17 | — | 0 | 281 | 62 | 7.1 | — | — | 400 |
| Shoitlands | 5 | ,001 | 038 | — | 4.7 | 22 3 | .40 | — | 5 | 261 | 95 | 7.3 | — | _ | 450 |
| Eynsford | 3 | .005 | .025 | — | 3.7 | 15 3 | .06 | — | 0 | 271 | 76 | 7.2 | — | — | 425 |
| Bexley | 2 | .000 | .023 | — | 4.8 | 16.3 | .04 | — | 3 | 285 | 91 | 7.1 | — | — | 450 |
| Wilmington | 8 | .013 | .022 | — | 6.0 | 20.8 | .21 | — | 0 | 295 | 81 | 7.1 | — | — | 450 |
| Darenth | 4 | .006 | .019 | — | 5.0 | 15.9 | .08 | — | 2 | 290 | 74 | 7.1 | — | — | 425 |
| Thames-derived | — | ||||||||||||||
| filtered water ... | 1780 | .016 | .088 | — | 4.2 | 27 7 | 1.10 | 0.3 | 14 | 244 | 70 | 7.7 | .37 | 11.5 | 450 |
BACTERIOLOGICAL RESULTS.
| Percentage of samples negative to Bact. coli in a 100 ml. | Bact coli per 100 ml. | ||
|---|---|---|---|
| Orpington well | 254 | 100.0 | Nil |
| North Orpington | 237 | 100.0 | Nil |
| Shortlands | 255 | 99.2 | .016 |
| Eynsford | 367 | 100.0 | Nil |
| Bexley | 234 | 100.0 | Nil |
| Wilmington | 422 | 100.0 | Nil |
| Darenth | 254 | 100.0 | Nil |
| Thames derived filtered water | 3946 | 99.8 | .010 |