Which of the following methods can help reduce water pollution?

Utilizing rainwater is an effective method for reducing water pollution. By harvesting rainwater, communities can decrease their reliance on conventional water sources, which often carry pollutants from industrial runoff, agricultural chemicals, and urban developments. Collecting rainwater for purposes such as irrigation or non-potable uses reduces the amount of stormwater that flows into storm drains and potentially contaminates local waterways. Additionally, rainwater catchment systems typically filter out debris and contaminants naturally, providing cleaner water for various applications and contributing to overall water conservation efforts.

The other methods do not contribute positively to reducing water pollution, which highlights the importance of rainwater usage as a sustainable option for water management.