Twenty three District Level Laboratories (DLL) in each of the districts of Assam have been established to facilitate Water Quality Analysis. The laboratories are equipped with different sophisticated instruments and facilities for testing different water quality parameters and the staff of the laboratories are well trained in and outside the state of Assam.

Each of the laboratories are to perform at least 150 Nos. of physical and chemical analysis and 60 Nos. of bacteriological analysis of water samples each month. To maintain the seasonal changes of the water quality different sources have been analysed at the interval of a weak. After analysing the water sample, if any water quality parameters is found beyond the permissible limit necessary steps have been taken to maintain the quality. The active performance of the laboratories has made the APHED capable of detecting various water quality problems.

The APHED is equipped with five Nos. of Ion-meter distributed by UNICEF. These Ion-meters are being used by the department for accurate determination of various water quality parameters particularly content of fluoride in water samples.