Individual CIOWTS Credential Holders

Please note all those appearing on this list hold an active CIOWTS credential with NEHA. If a credential's expiration date is past due, it is possible the credential holder is working with NEHA to bring the credential up to date. If you have questions with regard to the information posted please contact the NEHA Credentialing Department at 303-756-9090 ext. 310 or email any inquiries to credentialing@neha.org.

Find a CIOWTS Credential Holder in Your Area

City, state or credential holder's name

Michael Willey

Willey & Co., Inc.
Seaford, DE
Phone #: (302) 629-3327
Type: Basic
Credential expiration date: 2/28/2018

Charles Gardner

C. Gardner Construction Co. Inc
Shamong, NJ
Phone #: (609) 670-4326
Type: Advanced
Credential expiration date: 3/31/2017

Donald M. McAllister

Professional Waste Water Services Inc
Shenandoah, IA
Phone #: (712) 246-5592
Type: Advanced
Credential expiration date: 2/28/2019

Robert Wayne Crissman


Sophia, NC
Phone #: (336) 880-6740
Type: Advanced
Credential expiration date: 2/28/2019

Daniel L. Wilson

Wm H Wilson Enterprises Inc
Sparta, NJ
Phone #: (973) 219-1221
Type: Advanced
Credential expiration date: 3/31/2019

Thomas Alfsen

Berardi Building Company
Sparta, NJ
Phone #: (973) 729-8899
Type: Advanced
Credential expiration date: 9/30/2019

Larry Dombal

Septic Restoration Systems LLC
Sparta, NJ
Phone #: (973) 729-8549
Credential expiration date: 4/30/2017

Thomas Rusticus

Wm. H. Wilson Enterprises, Inc.
Sparta, NJ
Phone #: (973) 222-7161
Type: Advanced
Credential expiration date: 3/31/2019

Daniel L Wilson

Wm H Wilson Enterprises Inc
Sparta, NJ
Phone #: (973) 219-1221
Type: Advanced
Credential expiration date: 3/31/2017

Larry Dombal, Jr.

Septic Restoration Systems LLC
Sparta, NJ
Phone #: (973) 729-8549
Type: Advanced
Credential expiration date: 4/30/2017

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