1. Gray Water Irrigation Rules and Design Standards

2. Current and Proposed Statute  75-5-305 and 75-5-325 in 2007 Private, single-family residences  HB 285 Adds non-residential systems Addresses seasonal gray water systems and 75-5-317 MCA, Nonsignificant Activities

3. Rules and Design Standards  Subdivision - ARM 17.36.300  PWS - ARM 17.38.100  900 Series ARM 17.36.900 Local Government Local Government  DEQ 4

4. How We Developed These Rules and Guidelines  Looked at other states  Uniform Plumbing Code  Held a stakeholders meeting November 5, 2008 with: State of Montana State of Montana County Sanitarians County Sanitarians SAVE Foundation SAVE Foundation Developers Developers Citizens Citizens

5. What is Gray Water?  Wastewater that is collected separately from a sewage flow that does not contain industrial chemicals, hazardous wastes, or wastewater from toilets  Does not include in-house systems

6. Indoor Water Use Faucets 15.7% Other 2.3% Dishwasher 1.4% Leaks 13.7% Clothes washer 21.7% Bath 1.7% Shower 16.8% Toilet 26.7%

7. Gray Water Composition

8. How Will Gray Water Be Used?  Subsurface Only  Irrigation of plants not to be consumed by humans

9. Placement  Demonstrate 4 feet to ground water or a limiting layer  Horizontal Setbacks Wells (drinking water)– 100 feet Wells (drinking water)– 100 feet Wells (other) – 50 Feet Wells (other) – 50 Feet Surface Water – 100 feet Surface Water – 100 feet Flood plains- 100 feet Flood plains- 100 feet Property lines – 2 feet Property lines – 2 feet

10. Design Criteria  Sizing – based on receiving soils  All components labeled as non-potable (purple pipe)  Surge tanks

11. Permitting  No DEQ review for in-house recycle systems  No DEQ review for retro fits to existing approved wastewater systems  New gray water reviewed by DEQ and permitted by the county

12. Waste Segregation  Need an approved wastewater disposal system  May include kitchen waste

13. Gray Water and Public Wastewater Connections  Need the approval of the local entity