pH is an important physical parameter in controlling wastewater. Due to many chemical and biological reactions involving microorganism occur in certain pH. Analysis of wastewater from leather tanning industry without wastewater treatment plant, indicated wastewater pH 3 and that with treatment plant is 7.28. When pH of river changes extremely with pH less than 5 as indicated in wastewater without treatment plant directly discharged into water body, there will be change in river water such as disturbed fish life and other water animal, solved damaged mineral or metal, corrosion of iron pipes in water (Fardiaz, 1992).