California, Oregon and Washington are among the states moving forward with regulations and road maps for the construction and operation of building- and district-scale graywater capture and treatment systems for non-potable-water use, such as toilet flushing and irrigation. But similar rules for construction and operation of on-site potable-water systems are not yet on the regulatory officials’ radar screens. Without codes, the permitting of an on-site potable-water system becomes an approvals nightmare, say sustainability experts.
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