The drastic development within the last decade of economic activities in the watershed areas in the highland forest areas of Chiang Mai province such as contract farming, mainly for corn, has been a major vehicle of large forest, soil and water quality degradation. The intensive use of pesticides and fertilizers over extended period of times has exposed local populations to extended health problems with dramatic consequences if not closely followed up. Besides, the economic development of the area has also seen an increase of garbage, litter and unauthorized dump, which is currently becoming a new issue in highland area.