Seasonal collection of water samples were carried out at Alexandria coast from 18 selected stations during 2004 – 2005. The study area was divided into three sections A, B, and C. The study areas A and C are clearly affected by brackish polluted water discharge from El-Ammia, Rakta, Bughas, Umum, and Noubaria drains which were studied too. The hydrographic parameters (pH, DO, salinity. and OOM) were studied. This work aimed at evaluating some major ions level (average of 434.6 mg/l, 1.39 g/l, 3.11g/l, and 67.32 mg/l for Ca, Mg, SO₄, and Br in surface water and 449.12 mg/l, 1.48g/l, 3.42 g/l, and 75.68 mg/l in bottom water, respectively) in Alexandria coastal water and their chlorinity ratios relevant to the corresponding normal oceanic ones. The influence of dilution effect resulted from the discharge of different types and amount of land–based effluents was discussed. By all, the average chlorinity ratios of cations deviations from the respective oceanic values can detect as a resulting from the discharging of land –based effluents; (average of 0.074, 0.023, 0.004, and 0.172 for Mg/Cl, Ca/Cl, Br/Cl and SO₄/Cl, respectively). The correlation coefficients between the major cations and the hydrographic parameters were computed and discussed.