London's Pulse: Medical Officer of Health reports 1848-1972
View report page
Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Chislehurst 1950
[Report of the Medical Officer of Health for Chislehurst]
This page requires JavaScript
APPENDIX 5. RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO CHISLEHURST AND SIDCUP U.D.C. FOR 1950.
Parts per Million (unless otherwise stated).
| Description of the Sample | No of Samples | Ammo-niacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen Nitrate | Clorides as CL | Oxygen abs. from Permanganate 3 hrs. at 80° F | Turbidity in termsof Silica | Colour m.m, brown 2ft. tube Burgess Tintometer | Hardness (Total) | Hardness (Perm-anenfc) | pit Value | Phosphate as P.O. | Silica as Si02 | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Orpington well | 3 | .007 | .023 | 5.9 | 15.0 | .09 | — | 0 | 276 | 42 | 7.4 | — | — | 475 |
| North Orpington | 3 | .008 | .030 | 5.5 | 15.3 | .14 | .30 | 0 | 265 | 41 | 7.2 | — | — | 425 |
| Shortlnnds | 4 | .004 | .025 | 4.3 | 18.6 | .13 | — | 0 | 298 | 90 | 7.2 | — | — | 475 |
| Eynsford | 4 | .005 | .020 | 3.3 | 17.6 | .09 | 20 | 1 | 275 | 56 | 7.4 | — | — | 450 |
| Bexley | 5 | .006 | .031 | 5.3 | 19.3 | .09 | — | 2 | 291 | 69 | 7.2 | — | — | 450 |
| Wilmington | 4 | .023 | .034 | 7.0 | 22.0 | .12 | — | 0 | 292 | 67 | 7.2 | — | — | 500 |
| Darenth | 4 | .008 | .028 | 4.8 | 17.0 | .09 | .05 | 3 | 274 | 57 | 7 3 | — | — | 450 |
| Thames-derived | — | |||||||||||||
| filtered water | 1687 | .018 | .091 | 4.1 | 26 5 | 1.18 | .20 | 15 | 271 | 82 | 7 9 | .39 | 11.0 | 475 |
| Percentage of samples negative to Bact. coli in a 100 ml. | Bact coli per 100 ml. | ||
|---|---|---|---|
| Orpington well | 253 | 99.6 | .004 |
| North Orpington | 241 | 100.0 | Nil |
| Shortlands | 256 | 100.0 | Nil |
| Eynsford | 352 | 99.7 | 006 |
| Bexley | 217 | 100.0 | Nil |
| Wilmington | 248 | 100.0 | Nil |
| Darenth | 256 | 100.0 | Nil |
| Thames derived filtered water | 3602 | 99.9 | 002 |