Abstract: The study was carried out to evaluate underground water quality of some parts of Botswana (Serowe, Molepolole, Tsabong 1, Tsabong 2 and Kanye 1 and Kanye 2) regarding its suitability for irrigation. Twenty four boreholes were sampled and the water was analysed for pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+), bicarbonate (HCO3 ), carbonate (CO32 ) and chloride (Cl ). Sodium Adsorption Ratio (SAR) was calculated. Tsabong water had significantly high TDS, EC, SAR, Na+ and Cl compared to Serowe, Molepolole and Kanye and it was considered unsuitable for irrigation. Underground water from Molepole and Kanye 1 were found to be suitable for irrigation based on their TDS, EC, SAR, Na+ and Cl contents. Kanye 2 water was not suitable for irrigation due to high EC and TDS.