Boulder: Council to consider new agreement to allow testing of graywater system for dormitory


From the Boulder Daily Camera (Erica Meltzer):

The city’s Water Resources Advisory Board has already recommended approval of the agreement. The Boulder City Council will consider it Tuesday.

The dorm, which opened in fall 2011, houses 500 students near Baseline Road and 30th Street and received top green credentials from the U.S. Green Building Council, becoming the only residence hall of its size in the nation to earn the Leadership in Energy and Environmental Design platinum rating for its sustainability features. However, the university hasn’t yet been able to take advantage of additional plumbing installed during construction that would allow water from sinks and showers to be captured, filtered, treated and reused for flushing toilets. That’s because case law around water rights in Colorado protects downstream users from the potential loss of water that gets reused instead of being returned to the watershed…

However, that may be less of a concern when graywater is used in toilets — which ultimately send water into the same wastewater treatment system that handles water from sinks and showers — than it is when graywater is used for irrigation, Arthur said.

As part of the agreement, CU will carefully monitor water use in the building and report all that information to the city. Arthur said that will allow city officials to assess the impact of graywater systems on the larger water delivery and treatment system and might provide the basis to lobby for changes to state law…

In the meantime, the city is designating water from the Western Slope that it receives through the Colorado-Big Thompson water project for Williams Village North. Because that water is not from the Boulder Creek watershed, it’s subject to different rules and is eligible for reuse, Arthur said. That way, no downstream users should complain they aren’t getting all the water they are owed.

More graywater reclamation coverage here and here.

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