Question

the substances that make the water unifit for use are called​

Answer 1

Explanation:

If talk about the substances in one word which makes water unfit for the use is impurities. Impure water contains dust particles, sand or might even contain harmful/toxic chemicals which makes it unfit for drinking purpose.

Answer 2

Answer:

The three substances that can make the water unfit for drinking are heavy metals, pesticides and fecal matter of human or animal. The heavy metals like mercury, arsenic and others can make water unfit for drinking.