Hoyt Peckham, Ph.D., onye ọsụ ụzọ na-akwalite ịkụ azụ azụ nka iji kwalite ọrụ nlekọta mmiri nke dabere na La Paz, México, enyela 2014 Pew mkpakọrịta na nchekwa mmiri iji gbasaa n'ọrụ ya n'ịkwalite ịkụ azụ na-adịgide adịgide n'ụsọ oké osimiri nke Northwest Mexico. nye obodo ndị ọzọ na mpaghara na gburugburu ụwa. Peckham na-eso ndị ọkụ azụ̀ na ndị otu ha na-arụkọ ọrụ iji weghachi uru n'ịkụ azụ̀ ha, na-eme ka omume nkwado ha sikwuo ike site n'ịbawanye ọchịchọ maka nri azụ̀ ha. Akụkọ zuru ezu.