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Potable Waters, from Analyses by Rivers Pollution Commission, (1874,) (Parts of 100,000 Parts.)

Organic Carbon. Organic Nitrogen. Previous Sewage. parts parts Rain-water, collected in leaden gauges .070 .015 42 “ “ “ from roofs, etc., for domestic use .257 .080 12031 Dew or hoar frost collected on leaden gauges .264 .076 1536 Sea-water .278 .165 103 Upland surface, from non-calcareous strata .278 .033 0 “ “ from calcareous strata .346 .037 33 Land drainage water, from sewage farms .082 .191 10443 Deep well waters, in the chalk below London clay .093 .028 797 Spring waters, from the chalk .044 .010 3511 Bristol, from springs and deep wells .172 .024 16620 Edinburgh, from springs and streams—water filtered .145 .026 2020 Glasgow, from Loch Katrine .204 .017 0 Liverpool, Green Lane well .020 .020 3840 “ Rivington River, gravity supply, unfiltered .243 .031 0 “ “ “ “ “ filtered .210 .029 0 Birmingham, from Bourne River, normal .211 .039 2480 “ “ “ “ in flood .640 .059 3890 “ “ “ “ filtered .460 .045 2720 “ from Aston well .034 .006 1440 “ mixed waters—river and well .040 .010 1380 London, Thames water from Hampton Grand Junction Works .246 .033 3270 “ “ “ after subsidence “ “ “ .262 .042 3270 “ “ “ after filtration “ “ “ .231 .032 3140 Jacob’s Shallow Well, at Sheffield 1.200 .126 590