Independent advice, design, and problem solving for new and existing septic systems
Servicing Palmerston North - Manawatu, Taranaki, Hawke's Bay, Kapiti, Wellington and Wairarapa regions
Get it right the first time with independent septic tank and sewage system advice
Whether you have a new build in the country, or you need an upgrade for the farm dwellings, your septic/sewage system is one of the most important – and expensive – decisions you’ll make. The trouble is, most people don’t realise how easy it is to get it wrong.
Over two-thirds of sewage systems fail prematurely, according to council testing. Many don’t even last a few years before needing costly repairs or full replacement. That’s thousands of dollars down the drain – and often, it’s because the system was recommended by someone selling a particular product, instead of being focused on what actually suits your site.
That’s where Dave Miller comes in...
With more than 35 years of experience, Dave is one of New Zealand’s most trusted independent experts in septic tank and sewage system design and problem-solving. He doesn’t sell or install systems – so his advice is based entirely on what will work best for your soil, your land, your lifestyle, and your budget. Whether you're in Wellington, Kapiti, Palmerston North - Manawatu, Taranaki, Hawke’s Bay, Wairarapa or anywhere across the lower North Island, call Dave Miller first for the right advice.
Don’t let a sewage system become a sewage problem. It pays to talk to Dave first.
A rural house, modern and black with a hill and native bush behind it - links to Rural Septic Systems page
A well-designed sewage system should run quietly in the background — no smells, no stress, just clean, reliable performance. Whether you need help choosing the right system or problem-solving for one that’s not working as it should, Dave offers practical advice and smart solutions tailored to your property. Find out why getting the design right from the start is the smartest investment you can make.

When it comes to sewage systems, independent advice means advice that’s based on what’s best for you — not what someone’s trying to sell you. Dave brings decades of hands-on experience, offering honest, practical guidance tailored to your land, your needs, and your budget. With no products to push and no hidden agenda, he gives you the clarity to make a confident decision.
Close up view of a landscape architects hands holding a pen and pointing to a specific piece on a blue print design paper - links to the Why Get Independent Advice page
Aerial view of a rural house on a large lifestyle block with the house surrounded by a large circle of trees - links to the Case Studies page
Dave has helped homeowners across the lower North Island get long-lasting, practical solutions for their septic system issues. Whether it’s redesigning a failed system without ruining a landscaped lawn, creating discreet, high-performing treatment systems, or upgrading old tanks to meet modern needs, Dave’s expertise delivers results. These case studies show how his independent advice and smart designs save money, protect properties, and give homeowners peace of mind.
Contact Dave
Fill out the form and Dave will be in touch to discuss your requirements.
It costs nothing to ask ...and timely professional advice can save you money and stress!
What Dave's clients say
See what previous clients have said about Dave's advice and guidance
"Highly recommend his services"
- Oonagh Taru - Australia
"Can't recomment him enough"
- Nathan Lynn-Watts - Hutt Valley
"Much appreciated"
- Karen McDonald - Manawatu
"Dave went ABOVE AND BEYOND to help me which was really appreciated"
- Elish Barnett (Auckland)
"I would strongly suggest a call to Dave at the beginning of the project."
- Peter Sherlock (Horowhena)
"Dave has gone beyond the call of duty
and is always available and very helpful"
- Genevieve Nichols (Wairarapa)
"Bringing Dave in was like turning the lights on” 

- Richard Curtis (Wellington)
"Dave has been exceptional in his knowledge and advice"
- Anja Foley (Kāpiti)
" Saved us thousands!"
- Dr. Harry Ball (Manawatū)
Why Choose Dave Miller Environmental Engineer?
Respected Across The Industry
Architects, councils, builders, and homeowners trust Dave’s advice — and have done for years.
Pragmatic Advice
Clients appreciate Dave’s clear explanations, practical mindset, and no-fuss approach from the first visit to final plan.
Unbiased Independence
Dave doesn’t sell or install systems, so his advice is based solely on what’s best for your site — not what’s in stock.