Is your tap water as clean as you think?

Australia has some of the most rigorously tested drinking water in the world, and water that leaves a treatment plant meets strict national guidelines. But "meets the safety guidelines" and "as clean as it could be" are two different things. Between the treatment plant and your kitchen tap, your water carries more than just H₂O.

What's deliberately added to your water

Before water enters the network, utilities disinfect it — and for good reason. Disinfection is one of the great public-health wins of the last century, protecting us from bacteria and other pathogens. The two main disinfectants used in Australia are chlorine and chloramine (chlorine combined with ammonia).

Chloramine is increasingly used in cities with long distribution networks — including large parts of Adelaide — precisely because it is more stable and longer-lasting than chlorine. That persistence is the point: it keeps protecting the water all the way through hundreds of kilometres of pipe. The trade-off is that it's still in the water when it reaches your tap, your shower, and your kettle. And unlike chlorine, chloramine doesn't simply dissipate if you let a jug of water stand, and it's noticeably harder for basic filters to remove.

You can taste and smell chlorine compounds at surprisingly low levels — for many people, around 1 milligram per litre is enough to give water that distinct "swimming pool" character.

What your water picks up along the way

Treated water travels a long way before it reaches your home — and the network it travels through is made of pipes of varying age and material. Along the journey, water can pick up:

• Sediment, dirt and rust — fine particles from ageing mains, corroded fittings, and disturbances such as mains repairs or water main flushing. This is why water occasionally runs brown or cloudy after works in your street.
• Disinfection by-products — when chlorine reacts with natural organic matter in source water, it forms compounds called trihalomethanes (THMs). Australia's guideline limit for THMs is 250 micrograms per litre — for context, the European guideline is 100.
• Dissolved minerals — calcium and magnesium that make water "hard." Adelaide's water averages around 97 mg/L of hardness — moderately hard — which is what leaves scale on your kettle, taps, and shower screens.

So is your tap water clean?

It's safe — and that matters. But for most Australian homes, it's not as clean as it could be. The disinfectants that protect water in the network, the sediment it collects in transit, and the minerals it carries naturally are all still present at the moment it comes out of your tap.

A jug filter on the bench treats a couple of litres at a time, at one point of use. But you don't only consume water from the kitchen tap — you shower in it, bathe your kids in it, wash your clothes and food in it, and run every appliance you own on it.

What you can do about it

Start by knowing your water. SA Water publishes a drinking water profile for each supply zone, so you can look up the typical chlorine levels and hardness for your suburb. Then consider where filtration makes sense for your home.

A whole-home inline system — like the one we engineer and install here in South Australia — treats every litre at the point it enters your property: a stepped sediment filter captures dirt and particles down to 5 microns, then a 1-micron carbon stage targets chlorine and chloramine before the water reaches a single tap. Every shower, every appliance, every glass of water.