Rubuta ci gaba don wannan sakin layi - Dokar Ruwa ta Metropolis 1852 an zartar da ita "don yin tanadi don tabbatar da wadataccen 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". A halin yanzu, fashewa
Cutar kwalara a 1854 ta haifar da mutuwar kimanin mutane 4,267 da kamfanin ya samar.