Water reuse has become important in many parts of the country. The less that has to be treated in a metropolitan wastewater center, the more capacity there is and the less spending a city has to do to expand processing.

Don't think that graywater is something icky concept only used in down-market projects. The Waldorf Astoria Beverly Hills recently began the implementation of a water reuse system. Using Epic Cleantec's OneWater technology, the hotel will recycle an estimated 95% of its collected graywater — 438,000 gallons of water.

The graywater will go to landscape irrigation, saving the cost of potable new water use in the desert, saving money and improving environmental activity and standing.