Rivers, lakes, streams, and groundwater aquifers are the main sources of freshwater which has come to us. They are traditional sources. As demand increases and climate change alters the location and timing of water supply, these traditional sources are becoming unavailable. It becomes more difficult or expensive to develop. And cost of developing creases of the time, so many communities are switching to alternative sources of water. For example, rainwater, stormwater, greywater, reclaimed water, and brackish and seawater desalination.

Alternative water supplies can help to avoid too much pressure on traditional water sources. In some cases, increase the availability of existing supplies for other uses. Such as the environment is a very appropriate example. They can also give us diversify the water supply portfolio and improve reliability. Some alternatives, such as rainwater, stormwater, and greywater, are produced and accessed locally, which can reduce energy use and treatment and transmission costs. Others, such as desalination and reclaimed water, can have relatively enough high cost’s treatment. But the last one option will be very good during times of drought.

These alternative water supplies are an indefeasible part of the current and future water supply. With their use must be managed with full understanding of their costs and impacts. The Pacific Institute produces new and innovative research reports that will help engage and inform stakeholders interested in ensuring future supply using these non-traditional resources.