<prompt> Ground water has the following advantages except ?Likely to be free from pathogenic organismsUsually requires no treatmentSupply is likely to be ceain even during dry seasonLikely to be hard  <response>: Ans. is d i.e., Likely to be Hard Ground water is hard, but it is a disadvantage not advantage. Ground Rater o Ground water is the cheapest and most practical means of providing water to small quantities. o Ground water is superior to surface water, because the ground itself provides an effective filtering medium. Advantages It is likely to be free from pathogenic agents. o Requires no treatment disinfection. o The supply is likely to be ceain even during dry season. o 11 is less subject to contamination than surface water. Disadvantages o It is high in mineral content e.g., salts and magnesium which render the water hard. It requires pumping or some arrangement to lift the water. 