The paper entitled "Evaluation of surface water quality and heavy metal pollution of Coruh River Basin (Turkey) by multivariate statistical methods'' by Bilgin and Konanc (Environ Earth Sci 75: 1029, 2016) was discussed. The authors made a great effort measuring 21 water quality indicators for the surface waters from 14 monitoring and sampling stations selected in the Coruh River Basin (northeastern Turkey) during a period from June 2014 to May 2015. Unfortunately, various mistakes, e.g., several misevaluated water quality indicators and a number of mistyped parts, as well as incomplete evaluation were identified with respect to the surface water quality in the Coruh River Basin, northeastern Turkey. Moreover, Bilgin and Konanc (Environ Earth Sci 75: 1029, 2016) considered the Turkish Water Pollution Control Regulation (TWPCR 2004), which was repealed as of 30.11.2012, and the Council Directive 75/440/EEC (1975), which was repealed as of 22.12.2007, to evaluate the surface water quality in the Coruh River Basin, northeastern Turkey. The mistakes were corrected, and the surface water quality was reevaluated with reference to the Turkish Regulation being in force.