“In most places there is a legal requirement to intentionally pollute drinking water with human excrement.” That’s how the Cascadia Green Building Council frames the problem with recycling water. By law and by practice, the region has historically made it illegal, or at least highly impractical, to reuse water, even for uses that obviously don’t require clean drinking water such as flushing the toilet or washing the car. There’s no good reason why we should fill our toilet bowls with clean drinking water rather than lightly used recycled “graywater.”
The Northwest’s water reuse policies are changing, and not a moment too soon. Even in the rainy west side of the region, population growth is pressuring water supplies, just as climate change begins to yield weather mayhem. Water supply problems can be even more intense in the region’s drier places, and in much of the world.
Long ago, health concerns motivated strict no-contact rules for used domestic water: Every ounce of it must leave the area and flow to a waste treatment plant. The laws have scarcely changed until recently. That policy may have made sense when building trades were not very sophisticated in the Northwest, when inspectors were scarce, and when water was bountiful. Now, plumbers and plumbing inspectors are highly professionalized, many builders are creative and green-minded. Plus water is increasingly scarce and expensive.
Fortunately, several jurisdictions in the Northwest are leading the way to legalizing sensible, low-cost water-recycling solutions.