The water quality in Jinjiang has deteriorated.

According to Fujian Water Resources Bulletin 200 1 water quality evaluation, the length of the reach of Jinjiang River Basin that meets the second-class standard is 13km, accounting for 7.6% of the evaluated reach, and it is distributed between Anxi and Shiyong Station. The length of rivers whose water quality meets the Class III standard is 75km, accounting for 43.9%, mainly distributed in the upstream of Anxi Station and the downstream of Shijie Station. The polluted river is 83km long, accounting for 48.5%, mainly distributed in the upper reaches of Yongchun County and Honglai reach of Nan 'an City. The main pollutants are ammonia nitrogen and mercury.

With the increase of population, the acceleration of urbanization and the development of economy and society, the water quality in Jinjiang is still deteriorating. In 2004, the COD pollution capacity of Jinjiang River Basin was 97.30t/d, and the controlled discharge was 77.33 t/d, and the actual pollution capacity reached1.01.96t/d at present. The pollution capacity of ammonia nitrogen is 4. 135t/d, the controlled emission is 4. 107t/d, and the actual pollution capacity reaches 6.943t/d. There are five major pollution sources in Jinjiang River Basin, namely chemical sources, residents' living sources, coal mines, ferromanganese sources and agricultural production sources.