Eastern Mechi 8.3308.91.8 Eastern Kankai 7.7608.72 Eastern Arun 6.22009.12.1 Central East Rapti at Sauraha 7.82138.72.5 Western Seti at Ramghat 8.22229.32 Mid- Western Bheri at Chatagaon 7.82089.31.1 Far -Western Karnali at Chisapani 7.826410.51.5 Far -Western Mahakali at Pancheswor 8.811052 WHO Guideline 6.5-8.5 100>5.0 3