On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

SHMAK water quality – nitrate

The nitrate test included in SHMAK is a colorimetric test. You can order additional test kits from NIWA.

SHMAK Water Quality – Nitrate

The nitrate test included in SHMAK is a colorimetric test. You can order additional test kits from NIWA.