I-US Environmental Protection Agency (EPA) yamemezela ngoMashi 31, 2022 ukuthi ayihlosile ukulawula i-perchlorate emanzini okuphuza, igcine isinqumo sayo sikaJulayi 2020. I-EPA yaphetha ngokuthi isinqumo sangaphambilini sisekelwe kwisayensi etholakalayo engcono kakhulu. okokuqala iphakamisa amanzi okuphuza angu-2 ppb kanye nokuhlanzwa kwamakhemikhali ajwayelekile.”) Okuxakayo ukuthi kwakuyisinyathelo esisheshayo nesiwujuqu esathathwa yizifundazwe eminyakeni edlule esaholela ekutheni i-EPA yafinyelela ku-2020 iphethe ngokuthi amazinga e-perchlorate endaweni ezungezile ehla ngokuhamba kwesikhathi futhi awazange ahlangabezane nezindinganiso zokulawula zoMthetho Wamanzi Okuphuza Okuphephile (SDWA).
Ukuphindaphinda, ngoJuni 2020, i-EPA yamemezela ukuthi inqume ukuthi i-perchlorate ayizange ihlangabezane nezindinganiso zokulawula ze-SDWA njengento engcolisa amanzi okuphuza, ngaleyo ndlela ihoxise isinqumo sokulawula sango-2011. (Bona i-Holland & Knight's Energy and Natural Resources Blog, “EPA Finalizes Its Perchlorate Decision,” June 2021, EPA final. 2020. Ngokukhethekile, i-EPA inqume ukuthi ama-perchlorate awawona “avamisile futhi awavamile.” amazinga okukhathazeka kwezempilo yomphakathi ngokwencazelo ye-SDWA” nokuthi ukulawulwa kwe-perchlorate “akunikezi amathuba anengqondo okunciphisa izingozi zezempilo kulabo abahlinzeka izinhlelo zamanzi zomphakathi.”
Ngokucacile, i-EPA yaphinde yahlola isinqumo sokulawula sika-2011 futhi yenza ukuhlaziya okuningi phakathi neminyaka ihlola idatha yezenzakalo eqoqwe ku-Unregulated Contaminant Monitoring Rule (UCMR) nokunye ukuqapha e-Massachusetts naseCalifornia. Ukuhlola kabusha ngokusekelwe kule datha, i-EPA iphetha ngokuthi kunezindawo ezinikezwa amanzi zomphakathi eziyi-15 kuphela e-US Uhlelo luzodlula ngisho nenani eliphansi elinconyiwe (18 µg/L).Ngakho-ke, ngokulandela Isigaba 1412(b)(4)(C) se-SDWA SDWA, i-EPA inqume ukuthi, ngokusekelwe olwazini olutholakalayo, izinzuzo zokusungula i-perchlorate kazwelonke yezindleko eziyinhloko azihlanganisi ukulawulwa kwamanzi okuphuza ahlobene. inqubo yokwenza umthetho, i-EPA idinga ukunquma ukuthi umthethonqubo unikeza ithuba elinengqondo lokunciphisa ubungozi bezempilo obuhlinzekwa 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.