This paper introduces a 3-year eLearning program for teachers on water environment education co-sponsored by the Ministry of Education, the Environmental Protection Agency, and the Water Resources Agency for the school teachers to disseminate the core knowledge on water environment to facilitate nationwide water education. This is the most extensive eLearning program for teachers on water environment education in Taiwan. A total of ninety hours of eLearning courses will be offered to the school teachers from 2004 to 2007. The first 30-hour eLearning courses offered in year 2004 attracted 1,576 participants, among which 56% are elementary school teachers. On the other hand, 80% of the participants are 21 to 40 years old. Seventy two percent of the participants joined the program by self-motivation to enrich their own knowledge, while another 25% participated in order to improve their teaching performance. With the success of the program in 2004, the Ministry of Education not only continues its support but also set a challenging goal to train more than 160,000 participants from now to year 2008.