What Is Actually In Christchurch Tap Water?

Christchurch has one of the most enviable water supplies in the country. The city draws from a network of deep artesian wells, meaning the water arrives underground, naturally filtered through layers of gravel and rock before it ever reaches the treatment plant. It is consistently ranked among the best municipal water supplies in New Zealand.

That said, the water that enters your home is not identical to what flows from those wells. The treatment process introduces chlorine as a disinfectant. This is a necessary and effective public health measure, but chlorine does not disappear once it reaches your property. It continues through your pipes, out of your taps, into your shower, and ultimately into the water that fills your glass or your cooking pot.

Chlorine is not harmful at the concentrations used in this treatment. However, it affects the taste and smell of your water in ways that many people find unpleasant. It can also dry out skin and hair with regular exposure, and over time it can degrade rubber washers, seals, and other components inside your plumbing fixtures and appliances.

Beyond chlorine, some Canterbury properties, particularly older homes, may have copper or galvanised steel supply pipes that can introduce trace metals into the water as it passes through. While these are generally within safe limits, a filtration system provides an additional layer of reassurance.

The Main Types Of Water Filtration Systems

Not every home has the same needs, and the filtration industry reflects that with a range of system types. Understanding the differences helps you choose the right solution rather than paying for more than you need or less than you should have.

Whole-House Filtration Systems

A whole-house system, sometimes called a mains or point-of-entry filter, is installed where the main water supply line enters your property. Every tap, shower, appliance, and outlet in the home receives filtered water. This is the most comprehensive solution available and is particularly well suited to households with young children, anyone with sensitive skin, or properties where the protection of appliances and plumbing components is a priority.

Because the filter is treating all water entering the home, it does a lot of work. The filter media and cartridges will need to be serviced and replaced on a regular schedule, typically every six to twelve months depending on usage and the type of contaminants being removed. Your licensed plumber can advise on the correct service interval for your specific system and property.

Under-Sink Filtration Systems

For households that primarily want clean, great-tasting drinking and cooking water, an under-sink system is an efficient and cost-effective option. The unit sits concealed beneath your kitchen bench and connects to a dedicated filtered water tap alongside your existing mixer. Nothing clutters your benchtop, and the system works quietly in the background.

Under-sink filters are available in multi-stage configurations that progressively remove sediment, chlorine, and other compounds at each stage. A well-specified under-sink system will deliver noticeably cleaner water for drinking and cooking without the upfront cost of a whole-house installation.

Reverse Osmosis Systems

Reverse osmosis represents the highest level of filtration available for residential use. The system forces water through an ultra-fine semi-permeable membrane, which rejects the vast majority of dissolved solids, heavy metals, bacteria, and chemical compounds. The result is exceptionally pure water.

Reverse osmosis units are typically installed under the sink and include a storage tank because the filtration process is slower than a direct-flow system. If you are on tank water, have a specific health concern about water quality, or simply want the absolute best quality drinking water in your home, reverse osmosis is worth the investment.

Benchtop Filters

Benchtop units connect directly to your existing kitchen tap and sit on the countertop. They require no installation work and are easily removed, making them a practical option for renters. They are effective at reducing chlorine, taste, and odour, though they do not offer the same filtration performance as under-sink or whole-house systems.

Why Christchurch Homeowners Are Installing Water Filters

The most common reason we are called out to install a filtration system is straightforward: taste. Once you have lived with filtered water for a few weeks, the difference becomes difficult to ignore. Cooking, coffee, and cold drinks are all noticeably better when the water is clean.

Beyond taste, the reasons vary by household. Some clients are renovating and want to protect their new fixtures and appliances from the gradual effects of chlorine. Others have young children and want to remove any uncertainty about what is in their water. We also regularly install filtration systems for homeowners who have noticed their skin and hair feeling drier than usual, particularly those who shower frequently, chlorine exposure adds up over time.

For properties on private tank water rather than the Christchurch City Council supply, filtration takes on additional importance. Tank water does not go through the same treatment process as town supply, meaning sediment, bacteria, and other contaminants can be present. A properly specified whole-house system, often combined with UV treatment to handle biological contaminants, is essential for anyone relying on a tank supply for drinking water.

Does A Water Filter Need To Be Installed By A Plumber?

Yes. Any water filtration system that connects to your mains supply must be installed by a licensed plumber. This is a legal requirement under New Zealand’s Plumbers, Gasfitters, and Drainlayers Act 2006, the same legislation that governs all restricted plumbing work in the country.

This is not a technicality to work around. The connection point where a filter joins your supply line is a critical part of your potable water system. Incorrect installation can introduce a backflow risk, where contaminated water is drawn back into the supply line, or lead to leaks that cause significant property damage over time. A licensed plumber ensures the installation complies with the New Zealand Building Code, specifically Clause G12 which governs the safe supply and reticulation of water.

When Whitehead Plumbing and Gas installs your filtration system, we also provide guidance on the correct maintenance schedule and can set you up with regular service calls so your filter continues to perform as intended. A filter that is not serviced on time can become less effective, or in some cases, a source of contamination itself.

What To Expect From A Filtration Installation With Whitehead Plumbing & Gas

The process is straightforward. We start by understanding your water source, your household size, and what you are hoping to achieve. From there we will recommend the system or systems that best match your needs and budget, source the right equipment, and book the installation at a time that suits you.

Most under-sink and whole-house installations are completed in a single visit. We take care of the connection, test the system, flush the filter media, and walk you through the service requirements before we leave. 

If you are building or renovating, it is worth talking to your plumber about filtration early in the process. It is significantly easier and cleaner to plan for a whole-house system before walls are closed in than to retrofit one later.

Ready To Get Clean Water Throughout Your Home?

If you are in Christchurch or the wider Canterbury region and you want to talk through your options, get in touch with the team at Whitehead Plumbing and Gas. We have been working in this community for years, and we know the local water supply well. Whether you want a simple under-sink filter or a whole-house system, we will help you find the right fit.

Call us on 03 379 0711 or contact us here to book a consultation.