A Gradient Drainage is a family-owned and operated company proudly servicing Waiheke Island and beyond. Our team of highly trained and skilled professionals delivers drainage and septic solutions of the highest quality, with a reputation for reliability, efficiency, and exceptional workmanship.

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Specialising in island drainage solutions for even the most difficult sites, we bring years of hands-on experience and industry knowledge to every project. From on-site wastewater treatment plants to stormwater retention and detention tank installations, we provide tailored solutions that protect properties and the environment.

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We also supply and install trusted products, including Innoflow and RX Plastics water tanks, clean water filtration units, general drain laying, and septic maintenance services. Clients can explore our range of products and request quotes directly through our website, where we also share resources to help property owners make informed decisions.

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At A Gradient Drainage, our goal is simple: to exceed expectations by delivering effective, long-lasting drainage solutions for both residential and commercial sectors.