Ka cika wannan jumla: A kusan shekara ta 1850 ingancin ruwan sha ya zama abin damuwa ga jama'a, kuma John Snow ya bincika yanayin ruwa a shekara ta 1849. Majalisar ta zartar da Dokar Ruwa ta Metropolis 1852 don "ta samar da tanadi don tabbatar da samar da ruwa mai tsabta da lafiya ga Metropolis". A karkashin Dokar, ya zama ba bisa doka ba ga kowane kamfanin ruwa don cire ruwa don amfanin gida daga ruwan ruwan Thames bayan 31 ga Agusta 1855, kuma daga 31 ga Disamba 1855 duk irin wannan ruwa ya buƙaci a "tsarkake shi yadda ya kamata". Daraktocin sun riga sun yanke shawara a cikin 1847 don matsawa shigarwa don ɗakunan ajiyar su zuwa Seething Wells. An kammala kayan aikin a shekara ta 1852, kuma Lambeth ya haɗu da shi a can yana amfani da bututun ta zuwa birni ta Kamfanin Ruwa na Chelsea. Gidajen sun taka rawar gani a binciken kididdiga na John Snow a lokacin wani
cutar kwalara, kayan aikin sun fi sauran ayyukan ruwa yawa kuma saboda haka suna da ruwa mai tsafta, wanda ya haifar da karancin mutuwar kwalara.