Kulong Biru is one of the former tin mining pits located in Nibung Village, Central Bangka Regency, Bangka Belitung Islands Province. Now Kulong Biru has been used by the people as a tourist destination. Standardization of water quality in Kulong Biru with reference to Government Regulation Number 22 of 2021 and Minister of Health Regulation Number 32 of 2017 are important things to do as a bas…