Yiyang Group is the main provider for the most sewage water factories in xi’an ,including: xi 'an third sewage plant (150000 tons of sewage per day), xi 'an  fourth sewage treatment plant ( 200000 tons of sewage per day) , xi 'an fifth sewage treatment plant ( 200000 tons of sewage per day), xi 'an tenth sewage treatment plant ( 40000 tons of sewage treatment per day).

Xi 'an water (group) co., LTD is authorized by the municipal government state-owned companies,covering raw water, tap water, sewage treatment and gray water recycle investment construction and management as the main business .It also has   four sewage treatment plants with daily processing capacity of 1 million cubic meters.