Depending on where you live, your town's water supply may use a lot of ammonia or bleach to purify it. In my town, they use so much you can smell it right out of the tap. When you intake this, it is filtered out through the kidneys and down the urinary tract during urination, but your body will find other ways of getting it out too, like sweating or during ejaculation. Drinking bottled water should prevent this, if that's the case with your husband.