In addition to University-wide UTEP requirements for admission to M.S. degree programs, the admission requirements include:

Bachelor's degree in a Science or Engineering discipline
An official transcript, with the four-year baccalaureate degree posted, from the degree-granting institution and copies of transcripts for all other relevant upper-division and graduate work at accredited U.S. institutions or equivalent work and degrees at foreign institutions.
A statement of purpose outlining the prospective student's area of interest within Environmental Science
Three letters of recommendation
GRE is not a requirement
Applicants from countries where English is not the first language are required to demonstrate English proficiency.
If you did not attend high school in the United States and your most recent institution of learning was not located in an English-speaking country, UTEP requires you to provide evidence of English-language proficiency. Minimum score 550 on the paper-based (pBT) TOEFL. Some programs require 600 or better. Minimum score of 79 on the internet-based test (iBT), and minimum of 6.5 on IELTS.