1. Graywater in Austin, Texas Dr. Lauren Ross, Ph.D.,P.E., Glenrose Engineering, Inc.

2. Austin’s Water Supply: Lakeway Park on Lake Travis

3. Austin’s Water Supply: Lake Buchannan

4. Austin’s Water Supply: Lake Buchannan and Lake Travis Combined 685,000 acre- feet in storage, enough to fulfill LCRA firm water contracts for 1.3 years

9. No more than 400 gallons per day Only private residences Alternative wastewater system must be available Pipe must be purple and labeled Austin Gray Water Design Requirements

10. Must be distributed under at least 2 inches of soil, mulch, or gravel A plumbing license for pressure systems or more than 250 gallons per day A surge tank

11. Austin Gray Water Design Prohibitions No kitchen sinks, toilets, or diaper laundry water No use for toilet flushing No discharge to ponds, fountains, waterfalls, or creeks No use for vegetable gardens with root crops or where edible portions touch the ground

12. Austin Gray Water Design Prohibitions No ponding or runoff Not on slopes exceeding 3:1 No use over outcrop areas of the Edwards or Georgetown Limestone

13. Soil and Plant Health No chlorine products No sodium chloride-softened water No powered soaps or detergents

14. Soil and Plant Health Use cautiously: whiteners, softeners, enzymatic products Acid-loving plants will struggle

15. Design Example

16. Lauren Ross, Ph. D., P.E. Glenrose Engineering, Inc. lauren@glenrose.com 512-326-8880 Robert Stefani City of Austin Water Utility 512-974-9302