As 56-year-old Juana Salazar Segundo walked through her home in Chalco, a low-income suburb southeast of Mexico City, she recalled how black, reeking water had reached up to her belly button after flooding early last month. With the receding liquid now down to her ankles, Salazar waddled into her furniture-less bedroom, where only a water pump hummed in the corner. Sewage-infused floodwaters have invaded streets, homes and businesses in Salazar’s Culturas neighborhood of Chalco for over a month.