- Low-flow shower heads (sometimes called energy-efficient shower heads as they also use less energy, due to less water being heated).
- Low-flush toilets, composting toilets and waterless urinals, which can have a dramatic impact in the developed world, as conventional Western toilets use large volumes of water.
- Faucet aerators, which break water flow into fine droplets to maintain "wetting effectiveness" while using less water. As a bonus, they reduce splashing while washing hands and dishes.
- Wastewater reuse or recycling systems, allowing:
- Reuse of graywater for flushing toilets or for the garden, and
- Recycling of wastewater through purification at a water treatment plant.
- See also Wastewater - Resuse
- Rainwater harvesting
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