> Credentialing > CIOWTS
Installer of Onsite Wastewater
Treatment Systems (CIOWTS) Credential
Exam and Application
Credentialed Installer in Your Area (PDF)
is the CIOWTS Credential
Through a cooperative
agreement with the U.S. Environmental Protection Agency (USEPA), NEHA has
worked with and various partner groups to develop a national credential to
certify installers of onsite wastewater treatment systems. The credential
covers all forms of installation and will be offered at both a basic and
The credential is designed to test the knowledge, skills and abilities
needed for the successful installation of an onsite wastewater treatment
system. Since it is a national credential, and state and local codes are
not covered this credential is meant to enhance a state or local
A lot of time and effort is involved with maintaining an examination, a
database of credentialed individuals, and tracking continuing education.
NEHA hopes to make that task easier by offering this exam. For the
professional installer, NEHA would like to give you this opportunity to
set yourself apart from your professional colleagues and get the
recognition you deserve for your quality work and knowledge.
To be eligible to sit for the CIOWTS
credential examination, a candidate must meet the criteria as follows:
A. Be at least 18 years
And for Advanced Level CIOWTS exam
B. Have at least 2 years verified experience as an installer.
Verification must be included in application—please see application
for more details.
C. Proof of High School Diploma or GED.
NEHA’s Credentialing Handbook
It is strongly recommended that you read NEHA’s Credentialing Handbook: Guide to
Policies and Procedures for NEHA’s Credentialing Programs. This
handbook outlines all the policies you are expected to follow
by being a NEHA credential holder. The handbook also outlines in further
detail the procedures for applying for a credential, submitting
continuing education, and maintaining your credential.
If you would like to request a hardcopy of NEHA’s Credentialing Handbook, please contact the Credentialing Department at (303) 756-9090 ext. 310,