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There are mainly two chemical tests for a quality determination on water.
pH test: pH is the hydrogen concentration of fluid. The Value of pH indicates the alkalinity or acidity of water. The Value above 9.5 indicates highly alkaline and below 3 indicates the acidity of water. A low pH value can help for chlorination but corrosion issues may arise. drinkable water should have a pH between 6.5 to 8.5.
B.O.D: it defines the oxygen amount needed for micro-organisms in water to stabilize the organic matter which is decomposable under the aerobic condition. If we say B.O.D means less oxygen is there so it converts into organic pollution.