The qualifications for a wastewater job include a high school diploma or GED certificate and on-the-job training. Many employees prefer job candidates with an associate or a bachelor’s degree in environmental science or a related field. States also require a license for wastewater positions, with requirements varying depending on where you live. Pursuing certification may improve your employment opportunities and help with advancement to supervisory positions. The American Water Works Association offers several accreditation programs. Wastewater jobs often involve physically demanding work, which requires physical fitness. Excellent mechanical and technical skills are also necessary to operate the equipment efficiently.