Sample of leather tanning industrial wastewater was taken on discharge flow that is not using wastewater treatment plant and one using wastewater treatment plant. Analysis in laboratory include temperature, pH, BOD, COD, Cr(total), TSS and their comparison to wastewater quality standard according to DIY Governoor Regulation number 7/2010. Wastewater from leather tanning without treatment plant is given with chitosan coating active charcoal to study efficiency in decreasing leather tanning wastewater concentration