Environmental science majors are required to complete a minimum of 43 credit hours of coursework in biology and chemistry. Students must complete BIOL 110, 111, 204, 225; CHEM 101, 102, 201, 202, 210; plus one of the following courses: BIOL 250, 406 or CHEM 404. Students must complete one applied environmental science elective, to be approved by the department chair.

Additionally, MATH 247 is required. Students must select two of the following interdisciplinary electives: CJUST 320, ECON 312, HIST 203, PHIL 333, PSCI 230, PSCI 348, PSYCH 360, THEOL 341. Alternate environmental-related humanities or social sciences courses may fulfill this requirement upon approval by the department chair. Students must complete an experiential component consisting of 1-3 credits of an internship (ENV 480), independent study (ENV 411) or research project (ENV 450).

At least 3 credits must be at the 400 level. Students are encouraged to select the following sections of courses in the core curriculum (which do not count towards the major requirements): PHIL 212 Science and Nature and THEOL 207 Catholic Social Teaching. MATH 248, BIOL 306 and PHYS 101-102 or 201-202 are strongly recommended for students planning to apply for graduate school.

No minor in environmental science is available. Students who are not environmental science majors may minor in Environmental Studies.