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Consider composting toilets

Tags: Kitchen or bath addition, New construction, Kitchen or bath expanded existing space, Kitchen or bath existing space, Kitchen or bath existing space, Appliances & Plumbing Fixtures, cold, Composting Toilet Systems, dry, hot_humid, marine, mixed_humid

Composting toilets use little or no water.
Waste breaks down into a nutrient-rich compost that can be safely added to flowerbeds (but not vegetable gardens). A family of four produces only about 1 cubic foot of compost per year. Fecal matter decomposes at temperatures that are high enough to kill pathogens. Odor can be controlled by maintaining a proper balance of human waste and organic matter that is added to the mix, and by a continuously operating fan. Check local ordinances before installation.

Green Points

LEED for HomesLeadership in Energy and Environmental Design. LEED for Homes is the residential green building program from the United States Green Building Council (USGBC). While this program is primarily designed for and applicable to new home projects, major gut rehabs can qualify. : 2 points each for installing very high efficiency toilets (although not specifically composting toilets) up to a maximum of 6 (WE 3).
NGBSNational Green Building Standard Based on the NAHB Model Green Home Building Guidelines and passed through ANSI. This standard can be applied to both new homes, remodeling projects, and additions. /ICC-700: Up to 24 points for installing composting or waterless toilets and urinals (802.2).