I-US Environmental Protection Agency (EPA) yamemezela ngoMashi 31, 2022 ukuthi ayihlosile ukulawula i-perchlorate emanzini okuphuza, igcine isinqumo sayo sangoJulayi 2020. I-EPA yaphetha ngokuthi isinqumo sangaphambilini sisekelwe kwisayensi engcono kakhulu etholakalayo. umgwaqo omude kusukela iMassachusetts yaba ngesinye sezifundazwe zokuqala ezilawula i-perchlorate emanzini okuphuza ngo-2006. (Bheka iphephandaba i-Holland & Knight, "iMassachusetts ihlongoza kuqala amanzi okuphuza angu-2 ppb kanye nokuhlanza amakhemikhali ajwayelekile e-perchlorate.") Okuxakayo ukuthi kwakuyi-speed and isinyathelo esiwujuqu esathathwa yizifundazwe eminyakeni edlule ezaholela ku-EPA ku-2020 zaphetha ngokuthi amazinga e-perchlorate endaweni ehle ngokuhamba kwesikhathi futhi awazange ahlangabezane namazinga okulawula oMthetho Wamanzi Okuphuza Aphephile (i-SDWA).
Ukuphindaphinda, ngoJuni 2020, i-EPA yamemezela ukuthi inqume ukuthi i-perchlorate ayihlangabezani nezindinganiso zokulawula ze-SDWA njengento engcolisa amanzi okuphuza, ngaleyo ndlela ihoxise isinqumo somthetho sika-2011. (Bheka i-Holland & Knight's Energy and Natural Resources Blog, “EPA Finalizes Its Isinqumo Sokugcina,” Juni 23, 2020.) Isinqumo sokugcina se-EPA sashicilelwa ngoJulayi 21, 2020. Ngokukhethekile, i-EPA yanquma ukuthi ama-perchlorates awawona “avamile futhi awavamile.” amazinga okukhathazeka kwezempilo yomphakathi ngaphakathi kwencazelo ye-SDWA” kanye nalokho kulawulwa I-perchlorate “ayinikezi ngamathuba anengqondo okunciphisa ubungozi bezempilo kulabo abahlinzeka ngezinhlelo zamanzi zomphakathi.”
Ngokucacile, i-EPA yaphinde yahlola isinqumo sokulawula sika-2011 futhi yenza ukuhlaziya okuningi phakathi neminyaka ihlola idatha yezenzakalo eqoqwe Kumthetho Wokuqapha Okungcolisayo Ongalawulwa (UCMR) nokunye ukuqapha e-Massachusetts naseCalifornia.(Bheka I-Holland & Knight Alert, “EPA Proposes Perchlorate Ukubusa Ngemva Kweminyaka Yocwaningo,” Juni 10, 2019.) Ihlola kabusha ngokusekelwe kule datha, i-EPA iphetha ngokuthi kukhona kuphela amanzi omphakathi alawulwayo angu-15 e-US Uhlelo luzodlula ngisho nenani eliphansi elinconyiwe (18 µg/L).Ngakho-ke , ngokuhambisana neSigaba 1412(b)(4)(C), i-SDWA, i-EPA inqume ukuthi, ngokusekelwe olwazini olutholakalayo, izinzuzo zokusungula umthetho kazwelonke we-perchlorate primary water regulation azizisekeli izindleko ezihambisanayo.Ngesikhathi sokuhlola kanye nenqubo ye-SDWA , i-EPA idinga ukunquma ukuthi umthetho unikeza ithuba elinengqondo lokunciphisa izingozi zezempilo ezihlinzekwa uhlelo lwamanzi lomphakathi ngaphambi kokulawula.
I-Natural Resources Defence Council ngokushesha yakhipha isitatimende esigxeka lesi senzo.Ngokubheka icala lawo langaphambili eliphikisa isinqumo sika-2020, kusazobonakala ukuthi leso sinqumo siwukuphela komgwaqo ngempela yini.hlala ubukele.