Surface water inputs to Everglades National Park (ENP) include natural and anthropogenic sources.  Water quality varies spatially across ENP because of natural variations in hydrology, landscape and water delivery practices.  An evaluation of water-quality data in ENP provides a general distribution of hydrochemical facies within the park.  Specific conductance and concentration of chloride were used to evaluate not only the relative quality but also to elucidate differences in sources of water.  Wilcoxon signed-rank test showed that water sources at the park’s eastern and northern boundaries differed significantly in chloride concentration.  A historical review of chloride concentration in Shark River Slough (SRS) showed that averages were about 73 mg/L during1985-97, decreased to 43 mg/L in the 1998-02 and increased again to 59 mg/L in the 2003-05.  These changes in chloride concentration appear to have resulted from various water management and delivery plans implemented since the early 1980s.  Four different regions (North West, SRS, Taylor Sough and East Panhandle) stand out considering chloride, specific conductivity and hardness, which impart a distinct signature to the water quality inputs.  North West region had the best water quality inputs and the East Panhandle region had the poorest water quality inputs- an influence of agricultural runoff.