CEC started with environmental business, and still is,representing 70% of its present annual turnover. The track record has accumulated up to over 400 projects with a total contract amount of NT$2 billion. The main service products are environmental survey/ monitoring, EIA, water & wastewater treatment planning/design/ construction/contract operation, river pollution control, soil/ groundwater remediation, industrial water reuse, waste recycling, landfill and environmental park design & supervision, environmental policies & laws/regulations development and promotion.

Key clients include governmental sectors such as IDB, Bureau of Energy, EPA, local EPBs, CPC Corporation Taiwan, Taiwan Power Company, and private sectors such as Formosa Plastics Corporation, Taiwan Cement Corporation, Uni-President Enterprise Corporation, Taiwan University, Cheng Kung University, and Mackay Memorial Hospital, and so forth.Because of the outstanding performance and services, CEC has awarded by the EPA named as A class EIA consulting firm for many years.