A career in sanitation planning and design can help you make important contributions to the field of public health (without having to attend medical school first). A job in this field may see you designing facilities that ensure proper disposal of waste, and you might also work to figure out the best processes, not just systems, for doing so. Employment in the field of sanitation can also involve ensuring the safe treatment and handling of wastewater or performing testing to determine whether the local environment is safe and uncontaminated.