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David Bartholomew

Dave is a 1987 graduate of the University of Arizona, with a Bachelors Degree in Fine Arts. He is President of Bartholomew Water Services,, Inc., founded in 2008. The company specializes in the Operation & Maintenance of residential and commercial onsite systems as well as privately owned wastewater collection systems, lift stations, force mains, stormwater systems and reclaim/reuse water facilities.


Dave has over 30 years of experience in the water and wastewater industry and was certified as a Systems Inspector by NAWT in 2006 and has since received training in Soils Evaluation, Systems Design and Systems Inspection. Dave is OSHA HazWOPER certified, and holds certifications as a Wastewater Collection Systems Operator, Wastewater Treatment Plant Operator and Water Treatment Plant Operator.

Dave is currently a member of the ADEQ Onsite Wastewater Advisory Committee, which advises the State of Arizona in key matters involving our industry.


Dave joined the AzOWRA Board of Directors in 2009, served as President in 2013, continued to serve as a member of the Board of Directors, and has returned as President for 2023 and 2024. The Bartholomew family is now three generations deep in the effort to protect Arizona's precious waters.



Mike Madrid

Apache County



Joelle Wirth, RS

Joelle Wirth is a Registered Sanitarian with over 30 years experience with onsite wastewater in management, planning, permitting, design and administration. She has a Bachelor of Science from Northern Arizona in Resource Management and has been actively involved In the Aquifer Protection Rule writing process that has spanned from 1999 to today.

In addition to her work with Coconino County, she is an active member National Sanitation Foundation's Joint Committee for Onsite Wastewater, is a member of the multiple state, national and international technical advisory committees and in 2016 became a participating member of the Bill and Melinda Gates Reinvent the Toilet Challenge. Her work continues today with both national and international efforts.

Joelle is also a homeowner with a grey water system in her back yard that has been in operation for several years and has gardening as one of her hobbies.



Lou Brown

Lou Brown is one of the charter members of AzOWRA.


She has been involved in the onsite industry as the owner of Southwest Alternatives, a distributor for the Eljen Corporation.


She has played a key role in the organizing and promoting the organization for the last 14 years.


She has served as president, vide-president, past president and treasure of AZOWRA. This year the organization appointed her as the Executive Director for AZOWRA.



Kathy Mills, P.E.

Kathryn Mills is the owner of Mills Engineering, LLC, a firm founded in 2006 that provides soil testing and specializing in water and wastewater treatment. Kathryn received a Bachelor's degree from DePauw University in Greencastle, Indiana in 1989 and a Master of Science in Civil Engineering from the University of Arizona in 1991. Her experience includes 33 years in the water and wastewater fields in the public and private sectors and is a registered Professional Engineer in Arizona.


Kathryn is a past President of AzOWRA.



Jake Garrett, P.E.

Jake Garrett has been the Manager of the Gila County, Arizona Wastewater Program since 2002. He has been active in the onsite industry for the last 25 years, first in the private sector as a percolation tester, conventional and alternative system designer, and installation planning and execution under Arizona's Bulletin 12 and then the 2001 Rules.


In 2007 the Gila County wastewater program moved to the Building Department where he has worked to implement *one-stop-shop" for Gila County residents.

Jake was a participant in the 2005 rule revision process and has continued to participate in industry growth and education activities including various leadership roles.

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