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My parents used to make yogurt some years ago. When they tried to make some last month, it turned out very firm and smooth in appearence, but tasted like chlorine.

The taste is so strong that even strawberries couldn't get rid of it. Since then we have not tried making yogurt anymore.

Is the chlorine taste related to some fermentation level/age? Quality of milk?

Obs.: Though the chlorine taste was very strong, it wasn't sour.

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When home brewing beer, chlorine or iodine can contribute to chlorphenol or iodophenol in the end product which have a chlorine-like or medicinal tastes. I'm not 100% sure that it could happen in homemade yoghurt, but it might be a possibility. Chlorine is often found in treated tap water and both chlorine and iodine is used as disinfectants in many dairies. (chipre.iqm.unicamp.br/~marcia/Pub139.pdf) –  Didgeridrew Jul 26 '12 at 9:10

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Strangely enough, I do live near Campinas (where UNICAMP belongs), where water once "was" contamined by human hormones! (non-english site) , what a coincidence! I'm noticing the local water smell is terrible in chlorine, I wonder they're adding water in milk or cows are drinking thw water, very strange...

I will buy milk from differente towns and test this again.

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