Dokar gurbataccen mai ta 1990 (OPA) (101 HR1465, PL 101-380) ta zartar da Majalisar Dokokin Amurka ta 101 kuma Shugaba George HW Bush ya sanya hannu. Yana aiki don guje wa zubar da mai daga tasoshin ruwa da wurare ta hanyar aiwatar da cire man da ya zube da kuma ba da alhakin farashin tsaftacewa da lalacewa; yana buƙatar takamaiman hanyoyin aiki; ya bayyana ƙungiyoyi masu alhakin da alhakin kuɗi; aiwatar da matakai don auna lalacewa; yana ƙayyadad da diyya wanda masu cin zarafi ke da alhakinsa; kuma ya kafa asusu don lalacewa, tsaftacewa, da farashin cirewa. Wannan doka ta haifar da sauye-sauye na kayan aiki a cikin samar da man fetur, sufuri, da Kuma masana'antu. Dokokin da ke tafiyar da zubewar mai a Amurka sun fara ne a shekara ta 1851 tare da Dokar Iyakan Laifin Laifi . Wannan mutum-mutumin, a wani yunƙuri na kare masana'antar jigilar kayayyaki, ya bayyana cewa masu jiragen ruwa suna da alhakin kashe kuɗin da suka shafi abin da ya faru har zuwa ƙimar jirgin ruwansu bayan faruwar lamarin.