At the beginning of the year 2017, Peru was hit by heavy rains, as a result of these floods were generated, overflowing streams and alluviums throughout the country; all these events are cataloged as " Fenómeno del niño costero”. The Province of Trujillo was not alien to this phenomenon that has caused contamination mainly of the waters, the levels of contamination of the waters also caused the paralyzation of the Potabilization Plant administered by SEDALIB, with this the quality of potable water that is supplied to the Province of Trujillo in relation to ions, could exceed the Maximum Permissible Limits and cause serious problems in the Health of the Population. Through the ion chromatography method, the present project seeks to identify and quantify the presence of fluoride ions (F-), bromide (Br-), chloride (Cl-), nitrate (NO3-), nitrite (NO2-) ), sulfate (SO42-) and phosphate (P...