Wastewater Consultants is a New Zealand based specialist consultancy providing technical expertise in on-site wastewater assessment, design, and consenting support for residential, rural, and commercial developments. 

Based in Christchurch, we work throughout New Zealand and the South Pacific Islands.

We work with landowners, developers, engineers, and planning professionals to deliver compliant, efficient, and environmentally responsible wastewater solutions across a wide range of site conditions and project scales. 

Our Expertise:

Our small team brings together practical field knowledge and regulatory understanding to support the full lifecycle of on-site wastewater projects — from initial site assessment through to system design and resource consent documentation. 

We have been involved in septic tanks and on-site wastewater treatment systems for over 30 years. Dating back to when septic tanks were poured in the ground with plywood shutters then, using concrete rings with a bottom and lid poured on site right though to todays latest advancements in wastewater treatment systems.
We have designed, installed, serviced, repaired and diagnosed septic tank systems and know what works.

Our services include: 

·       Wastewater system design and optimisation  

·       Site and soil assessment reporting  

·       On-site wastewater feasibility studies  

·       Resource consent support and technical documentation  

·       Compliance advice aligned with regional council requirements  

We operate across all stages of development, ensuring wastewater solutions are appropriately designed, clearly documented, and aligned with applicable standards and environmental outcomes. 

Our Approach: 

We take a structured, evidence-based approach to wastewater consultancy. 

Every project is assessed on its individual characteristics, including soil conditions, land use, hydrology, and regulatory constraints. This allows us to develop solutions that are both technically sound and tailored to site-specific requirements. 

Our focus is on delivering outcomes that are: 

·       Compliant with regional and national regulations  

·       Technically robust and sustainable over the long term  

·       Practical to construct, operate, and maintain  

·       Cost-conscious without compromising performance  

Regulatory Knowledge: 

Navigating New Zealand’s wastewater consenting framework can be complex, particularly where regional council requirements differ. 

We maintain up-to-date knowledge of relevant planning instruments, discharge standards, and engineering guidelines to ensure our clients receive accurate and current advice throughout the consenting process. 

This helps reduce delays, minimise rework, and improve the likelihood of successful consent outcomes. 

Commitment to Quality: 

Wastewater Consultants is committed to delivering a high standard of professional service based on accuracy, transparency, and technical integrity. 

We prioritise clear communication, reliable reporting, and consistent delivery to support confident decision-making at every stage of a project. 

Working With Us: 

We collaborate closely with clients and project teams to ensure wastewater requirements are addressed early and effectively within the broader design and planning process. 

Our role is to provide clarity, reduce uncertainty, and support successful project delivery through informed wastewater design and compliance

Plan I Design I Consent