The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm.

Related MCQs

• The maximum permissible total solid content in water for domestic purposes should not exceed
• The quantity of arsenic in water for domestic purposes should not be more than 0.05 ppm.
• The maximum permissible chloride content in water for domestic supplies should not exceed
• The maximum permissible quantity of iron and manganese in water for domestic purposes should be
• The maximum permissible fluorine content in water for domestic supplies should be
• When turbidity of water exceeds about 45 ppm, coagulation
• Plain chlorination is adopted for treating the water having turbidities less than 20 to 30 ppm.
• The copper contents in water for domestic purposes should not be
• The presence of calcium and magnesium bi-carbonates in water causes hardness in the water.
• The maximum permissible quantity of lead in water for domestic supplies is