In certain parts of Austin, difficult conditions such as steep slopes, poor soil percolation qualities, close proximity to lakes, or other problems may require the services of a licensed Professional Engineer. However, in areas without unusual conditions, a sub-surface greywater system can be approved. Sub-surface distribution systems are required by the local Health Department for greywater. The rules that govern greywater systems are currently based on modifications of septic system guidelines. Some variances are permitted for greywater since less volume is created than in a septic system.
Low pressure dosing systems allow for uphill and smaller drainfields.
Above-ground greywater spray systems are not permitted in Travis County. Commercial Status Implementation Issues Sustainable Sources 1994-2000. Greywater Irrigation System Legend Satisfactory Satisfactory in most conditions Satisfactory in Limited Conditions Unsatisfactory or Difficult Sustainable Sources 1994-1999. Greywater systems have been used informally for a long time. Greywater systems are modifications of septic system technology and, thereby, use components standard to septic systems.