Any foreign component in a substance, for example in water. These contaminants are sometimes occurring in natural environments or human created ones. Some forms of chemical contaminants consist of:
- Salts
- Bleach
- Toxins
- Metals
- Nitrogen
- Pesticides
- Drugs
Organic contaminants are made up of biological substances in water that are also reffered to as microbiological contaminants or microbes.