Senior Hydraulic Modeller Wastewater

Tiaki Wai; Lower Hutt; On-site; NZD 112,000 - 158,000; Full time

Benefits offered by this job

Flexible working arrangements (up to 2

Wellbeing programme including one paid

Professional development opportunities

5 weeks annual leave after 2 years

Job summary

Tiaki Wai, a council-owned organisation delivering drinking water, wastewater and stormwater services in Hutt Valley, Porirua and Wellington, seeks a Senior Modeller (Wastewater) in Petone. You will develop and operate wastewater hydraulic models, advise networks and oversee modelling consultants.

You will influence decision-makers and contribute to capex proposals. Requirements include a tertiary qualification in engineering or science and ~10+ years in wastewater hydraulic modelling, with

Qualifications

• 10+ years' experience in wastewater hydraulic modelling.
• Modelling project management experience.
• Continuous improvement mindset with strong data analytics skills.
• Ability to influence.
• Strong written and verbal communication skills.

Responsibilities

• Provide technical advice to network operations, planning, engineering, and asset management teams.
• Conduct peer reviews of outsourced model build projects and master planning studies.
• Support strategic network planning and development control.
• Support modelling insights and operational delivery.
• Project manage external model build contracts.

Skills

Wastewater modelling

Modelling project management

Data analytics

Influence

Communication

Coaching

Education

Tertiary qualification in engineering or science

Job description

• Provide advice for complex infrastructure projects in Wellington


• Influence decision makers


• Petone-based role with easy access to rail, coast and local amenities

This is a full time position of 40 hours per week

The remuneration for this role is $112,118.39 to $158,284.79 (including KiwiSaver) depending on skills and experience

The opportunity

As a Senior ModellerWastewater you will develop, maintain and operate wastewater hydraulic models and contribute to the development of operations and capex proposals. Your expertise and comprehensive skills will be utilised across the company. You will take a collaborative approach, playing an active role in advising on various infrastructure projects and overseeing the management of modelling consultants.

You will get to:

• Provide technical advice to network operations, planning, engineering, and asset management teams


• Conduct thorough technical reviews (peer review) of outsourced model build projects and master planning studies


• Support strategic network planning and development control


• Support the organisation with Modelling insights and operational delivery


• Project manage external model build contracts

About you

To be successful in this role you will bring:

• A Tertiary qualified in a relevant discipline (for example, engineering or science)


• Ideally 10+ years' experience inWastewater hydraulic modelling


• Modelling project management experience


• A continuous improvement mindset with strong data analytics skills

• Ability to influence


• Strong written and verbal communication skills including being able to communicate complex technical information into simple language


• Experience in coaching and mentoring

Benefits

At Tiaki Wai, our purpose extends beyond delivering great water services for the region; we foster a thriving community, support a diverse workforce, and offer supportive development opportunities. We genuinely care about your safety and wellbeing.

Our benefits include:

• Flexible working arrangements including up to 2 days working from home


• Comprehensive wellbeing programme, including one paid wellbeing day annually


• Formal and informal professional development opportunities


• 5 weeks annual leave accrual will be available following 2 years of continual service

For a full list of our employee benefits click here.

About us

Tiaki Wai is a council-owned organisation responsible for managing the delivery of drinking water, wastewater, and stormwater services across Hutt Valley, Porirua, and Wellington.

We manage public-owned extensive water infrastructure and oversee the delivery of safe and reliable services for our communities. We focus on long-term investment, asset management, maintenance, and delivering major infrastructure projects that support public health, environmental protection, and regional growth.

Water is a precious taonga. At Tiaki Wai, we put care into every drop and are guided by our values of Integrity, Care, and Leadership. We work directly with water consumers and in partnership with councils and mana whenua to deliver better water outcomes for current and future generations.

Applications close: Thursday 3 December 2026

We will be reviewing applications as they are received and may progress suitable candidates prior to the closing date.

For further information, email: [e-mail]

Applicants for safety sensitive roles will be required to undergo drug and alcohol testing prior to commencing employment with Tiaki Wai. You must also be legally entitled to work long-term in New Zealand or eligible to obtain a working visa.