According to https://cee.rice.edu/academics/undergraduate-programs/bs-environmental-engineering , “As a newly introduced program the BSENVE degree is not currently accredited.” A prospective student interested in the major should ask whether it is in the process of seeking ABET accreditation and whether any new students will be covered if it becomes ABET-accredited (new programs cannot be ABET-accredited until the first students have graduated, but the ABET accreditation is retroactive to those students).
However, the BS degree in civil engineering at Rice is ABET-accredited, and has an environmental engineering subarea option. There is also a non-ABET-accredited BA degree in civil and environmental engineering that seems more aimed at pre-med/law/business/finance/etc. students who want some knowledge of engineering, rather than those who want to work as engineers (particularly licensed Professional Engineers as many in civil engineering do).