[BlindHandyMan] water question

[Spiro]

Hello folks,
My female cohabitants have been noticing the following concerns with the 
water in the house:
cloudy hot, musty smelling and tasting cold.
I may have noticed that the other day.
We haven't drained he hot water tank ever, twenty years, and I plan on it.
but what can one do other than running the cold for 10 seconds.
I live in Philadelphia and do not know if there has been a drop in 
purification as of late.
Can one easily clean the pipes?
Thanks