Sewage discharge, particularly in areas with inadequate wastewater treatment infrastructure, is a major contributor to water pollution in urban environments.

Heavy metals are typically not associated with agricultural pollution, but rather with industrial activities.

Bioremediation refers to the natural process by which microorganisms break down and remove pollutants from the environment, including water.

Deserts are terrestrial ecosystems, not aquatic ecosystems.

Biomagnification refers to the increasing concentration of pollutants in organisms at higher trophic levels in a food chain.

Water pollution typically has negative impacts on aquatic life, including reduced growth rates.

Phytoremediation refers to the use of plants to remove pollutants from soil and water.

Salinity is typically not measured in freshwater quality assessments.

Decomposition is the natural process by which microorganisms break down organic matter into simpler compounds.

Agricultural runoff is typically not associated with industrial pollution, but rather with agricultural activities.

Nitrification is the process by which ammonia and nitrite are converted into nitrate by microorganisms.

Water pollution typically has negative impacts on human health, including increased risk of waterborne diseases.

Assimilation is the process by which nutrients are taken up and used by plants and algae.

Recommended levels are not typically used as water quality standards.

Denitrification is the process by which nitrates are converted into nitrogen gas by microorganisms.