The water question: why Canberra brewers don't really treat their water

Most cities, brewers run their tap water through a reverse-osmosis rig before they brew. Here, most don't bother. The Cotter and Googong reservoirs deliver.

Here’s a small detail that most Canberra brewery tour guests don’t ask about, which is a shame because it’s one of the most interesting things about the local scene: the water.

Most working breweries, in most Australian cities, run their tap water through a reverse-osmosis rig before they brew with it. They have to. Sydney’s Warragamba water is hard. Melbourne’s Yarra Glen feed varies by season. Adelaide’s water is so dosed with chlorine and chloramine that you can taste it in a finished beer if you don’t strip it out first.

Canberra brewers, by and large, don’t bother. They draw straight off the tap.

Why this matters

Water is the largest single ingredient in beer. A glass of finished pale ale is somewhere around 92% water by volume. The mineral profile of that water — calcium, magnesium, sulphate, chloride, sodium — does real work. Hop-forward styles need certain ratios; malt-forward styles need different ratios. Get it wrong and you end up adjusting flavour with hops and malt to compensate, which costs money and tastes worse.

Canberra’s water comes from the Cotter and Googong reservoirs, both of which are unusually soft and clean. The TDS (total dissolved solids) is about 30-50 ppm depending on season, where Sydney’s runs 90-130 and Adelaide’s can hit 250.

Soft water, low TDS, low chlorine — it’s basically the brewer’s dream water profile out of the tap.

What the brewers actually do

I asked four Canberra head brewers what their water treatment looks like, and the answer, summarised, is: “we make small calcium adjustments per batch and otherwise leave it alone.”

That’s nearly unheard of in Australian brewing. Most production breweries have at least one full water treatment pass before grain even goes into the mash tun. The fact that Canberra brewers don’t need to means a slightly faster brew day, slightly cheaper finished beer, and — and this is the part that matters — a slightly cleaner expression of the malt and the hop, because nothing’s been added to compensate for water.

Why this shows up in the finished product

The Canberra style — and there is a Canberra style, even if nobody markets it that way — leans hop-forward and dry. Look at Bentspoke’s Crankshaft. Capital’s Trail Pale. Pact’s Long Time. All of them are pale, dry, hop-forward beers with a faint bitterness and a clean finish.

That style suits soft water. Hard water, with high sulphate, accentuates bitterness too much and makes it harsh. Soft water keeps it polite.

A tour-day demonstration

If you want to taste this yourself, our Saturday full-day CanBEERa Explorer does a side-by-side blind tasting at BentSpoke — same recipe, two batches, one brewed with Canberra tap water and one with hardness added to mimic Sydney. The difference is small but real, and most guests can pick it.

It’s the kind of detail that doesn’t fit on a brewery website but explains something about why Canberra punches the way it does.

Ready when you are

Talk it over with the people who wrote it.

The journal is a side project of doing tours every weekend. If you want a proper conversation about Canberra craft beer, come for the day.