Currently, Ha Long - Bai Tu Long bays annually receive approximately 43 thousand tons of COD
9 thousand tons of BOD
5.6 thousand tons of N-T
nearly 2 thousand tons of P-T
135 tons of heavy metals and 777.5 thousand tons of TSS. To 2020 year, the estimated pollution loads will be 37.7 thousand tons of COD
5.2 thousand tons of BOD
5.2 thousand tons of N-T
2.7 thousand tons of P-T
106 tons of heavy metals and 736.5 thousand tons of TSS. Ha Long - Cam Pha areas are and will be the provider of most of the pollutants into Ha Long - Bai Tu Long bays nowadays. Each other area contributes about 10 percent of the total organic matter, nutrients and a negligible amouni quantity of heavy metals. Estimated pollution loads in the coastal area in 2020 year increase about 1.2- 2.3 times more than that ones nowadays. However, the area will be invested wastewater treatment plants so all most of the estimated pollution loads of Ha Long - Bai Tu Long bays are lower than that ones nowadays (0.50.9 times). So, to protect the Ha Long bay - Bai Tu Long bay water environment need to focus on technological solutions and increased control more than limit develop activities.