Utah Administrative Code
Topic - Environmental Quality
Title R317 - Water Quality
Rule R317-401 - Graywater Systems
Section R317-401-2 - Definitions

2.1 Definitions found in Rule R317-4 apply to graywater systems except where specifically replaced in Section R317-401-2:

"Aggregate" means regulatory authority approved clean porous material used to disperse graywater.

"Backflow" means the phenomena that occur when the customer's pressure is higher than the supply pressure. This could be caused by an unprotected cross connection between a drinking water supply and a pressurized irrigation system, a boiler, a pressurized industrial process, elevation differences, air or steam pressure, use of booster pumps or any other source of pressure.

"Bedroom" means any portion of a dwelling that is so designed as to furnish the minimum isolation necessary for use as a sleeping area. It may include a den, study, sewing room, or sleeping loft. Unfinished basements shall be counted as a minimum of one additional bedroom.

"Distribution zone" means any portion of a graywater irrigation system that discharges graywater to a specific area for irrigation purposes.

"Graywater" means wastewater from bathtubs, showers, bathroom washbasins, clothes washing machines, or laundry tubs. Graywater does not include wastewater from toilets, kitchen sinks, photo lab sinks, dishwashers, water softeners, garage floor drains, or other sources that pose a public health hazard.

"Irrigation system" means any network of pipes, drip irrigation lines, or mulch shields used to distribute graywater in a manner suitable for subsurface landscape irrigation.

"Mulch Shield" means a perforated vessel into which graywater is discharged and is temporarily detained before draining into a mulch basin.

"Non-Residential" means a building that produces domestic wastewater, and is not a single-family dwelling.

"Regulatory Authority" means either the Utah Division of Water Quality or the local health department having jurisdiction.

"Residential" means a single-family or multi-family dwelling that produces domestic wastewater.

"Stub-out" means a plumbed connection located with fixtures in compliance with Rule R317-401 for diversion of graywater from wastewater plumbing. A stub-out shall be connected to an approved graywater collection system or capped for future connection.

"Surge Tank" means a water-tight tank used to equalize peaks in graywater pressure and flow so that graywater may be dispersed gradually over time. A surge tank is intended only for temporary storage of graywater during periods of peak flow.

"Three-way diverter valve" means a valve that allows the operator to send graywater to the graywater system or to the building sewer.

"Tier 1 system" means a gravity-fed graywater system that does not include any surge tank, pretreatment, or pressurized components. A Tier 1 system may be appropriate for retrofit situations. A Tier 1 system is intended to be simple to operate and can be easily disconnected during winter months or other periods when the system may not be in use.

"Tier 2 system" means a graywater system that employs a surge tank, pretreatment, drip line irrigation system, or pressurized components.

"Unapproved graywater system" means any graywater system that is deemed by the regulatory authority to have been installed, repaired, or altered without required regulatory oversight, permit, or inspection.