Ka cika wannan furcin: An kafa Dokar Ruwa ta Birni na shekara ta 1852 "domin a yi tanadi don a ba Birnin ruwa mai kyau da kuma tsabta". 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". A halin yanzu, wani
barkewar cutar kwalara a 1854 ya haifar da mutuwar kimanin mutane 4,267 da kamfanin ya samar.