The water is not potable.

Water from that river is not potable.

The death toll in Puerto Rico grew in the three months following Maria’s landfall on the island due in part to the lack of electricity and potable water as well as access to medical facilities and medical care.

Tobacco, divine, rare, superexcellent tobacco, which goes far beyond all the panaceas, potable gold, and philosopher's stones, a sovereign remedy to all diseases...but as it is commonly abused by most men, which take it as tinkers do ale, 'tis a plague, a mischief, a violent purger of goods, lands, health, hellish, devilish and damned tobacco, the ruin and overthrow of body and soul.

We had no potable water.

Tom knows that more than 91 per cent of the Norwegian population is supplied with potable water from surface water sources.

I had barely enough potable water for a week.

Attention! The water is not potable!

The green water is not potable.