California State University San Marcos (CSUSM) and San Marcos Elementary Schools have established a partnership to offer a large-scale community service learning opportunity to enrich science curriculum for K-5 students. It provides an opportunity for science, technology, engineering, and math (STEM) majors to give back to the community, allowing them to experience teaching in an elementary classroom setting, in schools that lack the resources and science instructor specialization needed to instill consistent science curricula. CSUSM responded to this need for more STEM education by mobilizing its large STEM student body to design hands-on, interactive science lessons based on Next Generation Science Standards (NGSS). Since 2012, the program has reached out to over four thousand K-5 students, and assessment data have indicated an increase in STEM academic performance and interest.