House Bill 1575, by state Rep. Scott Martin, defines gray water as untreated household wastewater that has not come in contact with toilet waste or water from a kitchen sink. The legislation directs the Department of Environmental Quality to exempt private residential gray water reuse systems that meet a series of rules including that they make use of less than 250 gallons of gray water per day. A gray water system would be used for gardening, composting or landscape irrigation.
Gray water systems that would be exempt would have to:
- provide for overflow into the sewer or on-site wastewater treatment and disposal system;
- include cover for any gray water storage tank to avoid the creation of a habitat for mosquitoes and other insects;
- be located outside of a floodway and five feet above the groundwater table;
- clearly identify gray water pressure piping as a non-potable water conduit;
- be used on site and not run off the property;
- minimize the potential for contact with people or domestic pets;
- minimize standing water and ensure the hydraulic capacity of the soil is not exceeded;
- avoid spraying or discharge into a waterway; and
- be in compliance with municipal or county ordinances.