After the entry into force of the standard, some inconsistencies related to the established specifications and the test methods described in the standard were identified, which hinders their full compliance, such as: that NOM-127 was not mentioned in the body of the standard -SSA1-1994 of water for human consumption and use, with water being the raw material for the product being regulated; Establishment of an allowable maximum limit that could not be measured because the level of detection of the test method was higher than that; The lack of a test method for the determination of a parameter as is the case of purgeable organic carbon so it is eliminated; Limitation in the use of alternative methods. Also, some points were identified whose wording was not clear enough or could simply be written in a simpler way to facilitate their understanding and application or even required to be eliminated because they were repetitive.