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Gray Water Irrigation Rules and Design Standards

Gray Water Irrigation Rules and Design Standards. 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. Rules and Design Standards.

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Gray Water Irrigation Rules and Design Standards

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  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 • 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 • County Sanitarians • SAVE Foundation • Developers • 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 Other 2.3% Leaks 13.7% Toilet 26.7% Faucets 15.7% Dishwasher 1.4% Shower 16.8% Clothes washer 21.7% Bath 1.7%

  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 (other) – 50 Feet • Surface Water – 100 feet • Flood plains - 100 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

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