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“Graywater” refers to wastewater generated from bathtubs, showers, bathroom sinks, laundry sinks, and most clothes-washing machines. It does not include water from kitchen sinks, dishwashers, or toilets.
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A new state law, House Bill 24-1362, passed in 2025 required cities to update their municipal codes related to graywater by January 1, 2026.
Longmont does not currently permit the installation of graywater systems. While the city strongly supports water conservation and continues to expand related programs and outreach, permitting graywater reuse would require a specialized local oversight program to handle design reviews, inspections, enforcement, recordkeeping, and complaint resolution.
The city’s current priorities and resource commitments make a new oversight program impractical. In November 2025, City Council passed Ordinance O-2025-73 prohibiting the installation of graywater systems in Longmont. This decision does not close the door on future adoption.
Interest in graywater is increasing across Colorado, and Longmont will continue to evaluate whether developing a local control program makes sense. Factors the city will continue to monitor include: