Kathmandu, July 2 -- With the use of household water storage tanks rising across Nepal and growing concerns over product quality, the Nepal Bureau of Standards and Metrology (NBSM) has revised and proposed new standards for rotational moulded polyethylene water storage tanks.

The existing standard, first introduced in 1995, is voluntary. Only manufacturers that obtain the Nepal Standards (NS) certification are required to comply with its specifications.

"Microplastics and nanoplastics can leach into stored water when plastic tanks degrade due to prolonged exposure to heat and sunlight, particularly if they are not manufactured according to Nepal Standards," said Anil Shakya, director at the Nepal Bureau of Standards and Metrology.

"The...