What are the requirements for installing the distribution box?
Distribution boxes (d-boxes) must be level, set on a firm foundation and placed in the correct direction. One opening is one inch higher than the remaining openings; this is the inlet side of the d-box. Attach the inlet end of the d-box to the septic tank by a solid pipe at least two feet in length.

Pipes must extend into the d-box one inch and be level, secure, and watertight. Once approval to backfill has been granted, seal the d-box lid so that it is watertight. All connections outside of the disposal field must be watertight.

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1. How do Onsite Wastewater Treatment Facilities (OSWTFs) work?
2. Why do Onsite Wastewater Treatment Facilities fail?
3. What items should not be put down the drain?
4. Do Onsite Wastewater Treatment Facilities (OSWTFs) cause health or water quality problems?
5. Can I apply for a permit to drill a well at the same time I apply for the Onsite Wastewater Treatment Facilities (OSWTF) permit?
6. My neighbor’s OSWTF is located on my property. What do I do?
7. What is an alternative system?
8. What are the different types of alternative systems allowed in Maricopa County?
9. Do I have to hire an engineer to design my system and draft my plans?
10. Can I make changes after I have submitted the NOID packet?
11. Can I make changes to an approved plan?
12. Can I request a partial construction inspection?
13. What type of rock should I use in the trenches, beds, or pits?
14. What are the requirements for installing a septic tank?
15. What are the requirements for installing the distribution box?
16. What are the requirements for installing the disposal field?
17. My system is failing. What do I do?
18. Can I use the existing septic system for my new house?
19. When can you release my building permit?