Onsite Wastewater Management Systems (OWMS)

On-Site Wastewater Management Systems (OWMS) go by a range of names, including septic tanks, onsite systems, and On-Site System Effluent Treatment (OSET) and many more.

Roughly 18% of New Zealand's population discharges its waste via OWMS.

The OWMS SIG (Special Interest Group) are a voluntary network of professionals involved in their manufacture, design, operation and regulation.

The Water New Zealand OWMS Special Interest Group aims to:

  • Encourage whole of system considerations OWMS
  • Support initiatives to ensure an adequately trained and qualified workforce
  • Advocate for cohesive regulatory landscape for OWMS
  • Provide a focal point for collaboration amongst OWMS professionals.

Our mission is to uphold Te Mana o te Wai by promoting sustainable, effective, and fit for purpose on-site wastewater management systems that safeguard environment and public health.

Membership of the groups is open to all Water New Zealand members. If you are a member and wish to belong to one of the special interest groups, make sure you are logged in, then simply send an email via the contact form at the bottom of this page.

If you are not a current member, visit our membership page for more information. Remember to tick the appropriate Special Interest Group box when completing the Membership Application form.

OWMS Resources

OWMS Committee

Become a member to be a part of OWMS SIG