Department of Homeland Security: Sanitation and Waste Operations (Fiscal Year 2020 Report to Congress) [open pdf - 466KB]
From the Executive Summary: "This report details CBP's [U.S. Customs and Border Protection] efforts to protect employees and to mitigate health impacts to personnel related to toxic crossborder flows. The health and safety of its employees are of paramount concern for CBP. For decades, sewage from Mexico has been flowing into the United States and through CBP's areas of responsibility. Beginning in 2017, CBP requested that its Office of Human Resources Management, Occupational Safety and Health (OSH) Division assess areas along the Southwest Border to determine the contaminants to which Border Patrol agents (BPA) currently may be exposed because of raw sewage and other contaminants from Mexico flowing into the United States. The OSH Division has conducted assessments, which include sampling CBP employees working in the affected areas, analyzing the results of the samples, conducting onsite observations, and implementing administrative and engineering controls, personal protective equipment, and other protective protocols. CBP OSH has conducted personal air sampling for bacterial endotoxins, heavy metals, and personal air and wipe sampling for pesticides on BPAs in the affected areas of operation. The collected samples were analyzed by accredited laboratories contracted through the U.S. Department of Health and Human Services, Federal Occupational Health. Results of the samples collected since 2017 have shown that no employees have had an exposure over any Department of Labor Occupational Safety and Health Administration permissible exposure limits."
Department of Homeland Security: https://www.dhs.gov/