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

Jose J. Calderon

Mosser Plumbing Inc
Marina Del Rey, CA
Phone #: (310) 918-9554
Type: Basic
Credential expiration date: 12/31/2015

Richard T. Carlson


Mays Landing, New Jersey
Phone #: (609) 625-4829
Type: Advanced
Credential expiration date: 5/31/2019

Gary T. Ervey

L. N. Rothberg
Mendham, New Jersey
Phone #: (732) 687-7412
Type: Advanced
Credential expiration date: 1/31/2019

Ronald Zeck

E and Z Construction LLC
Mickleton, New Jersey
Phone #: (856) 832-4223
Type: Advanced
Credential expiration date: 3/31/2019

Phillip Sabatino

J.A. Neary Excavating Corp
Middlesex, New Jersey
Phone #: (908) 359-5574
Type: Advanced
Credential expiration date: 1/31/2019

Charles R. Diehl, Jr.

3-C's Backhoe Service
Middletown, NJ
Phone #: (732) 495-3119
Type: Advanced
Credential expiration date: 5/31/2018

Robert T. Osborne

Castle Septic Serivce Corp
Milford, New Jersey
Phone #: (908) 995-7438
Type: Advanced
Credential expiration date: 1/31/2019

Gerald Smith

Bedminster Excavation
Milford, New Jersey
Phone #: (908) 619-4914
Type: Advanced
Credential expiration date: 1/31/2019

Eric Valentine

E3 Environmental LLC
Milford, Delaware
Phone #: (302) 258-0706
Type: Advanced
Credential expiration date: 1/31/2019

William S. Opperman

Thunderbolt General Contractor Corp
Millville, New Jersey
Phone #: (856) 327-8629
Type: Advanced
Credential expiration date: 3/31/2019

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