abhaygirish1Dear Mr. Shrikant ,
Two reasons : 1. If water is Stagnant 2. due to oxidation of MS - water became black in colour . Don't worry . You need to take weekly trials of hydrant points so that this problem will be resolved .
From India, Thana
hansa vyasDear SRIKANTH,
As rightly said by Mr. Abhay,Corrosion can be one of the reasons for this. Also make sure there is no other impurity present near by which entering into hydrant line due to leakage like crude oil or any slug or solution which is making water black.
From India, Udaipur
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