Do I have to hire an engineer to design my system and draft my plans?
No. Only an alternative system requires an engineer to properly design, select and lay out the onsite system. Conventional systems may be designed by the homeowner or any other party authorized by the owner provided all requirements listed in the Arizona Aquifer Protection Permit Rule and the Maricopa County Onsite Wastewater guidelines are observed and satisfied.

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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?