Our Coffee Tastes Different at the New Location: It's Probably Alkalinity

You opened a second site. You moved the same machine, the same grinder, the same roaster, the same recipe and — in the good version of this story — the same barista. And it tastes wrong. Flatter. Duller. Or sharp and thin in a way the first shop never was.

Everyone looks at the beans first, because beans are the variable everyone is trained to think about. Then the grind. Then the barista.

It is usually the water, and usually one specific property of it: alkalinity.

Hardness and alkalinity are not the same thing

This is the confusion at the centre of nearly all of it, so it is worth two minutes.

Hardness is mostly calcium and magnesium in solution. It is what scales your boiler and destroys your machine. It is the thing filtration is usually sold on.

Alkalinity is the water's capacity to neutralise acid — its buffering strength, largely from carbonate and bicarbonate. It is what determines how the acidity in your coffee actually reads on the palate.

They often move together, which is why people treat them as one number. They are not one number, and for taste, alkalinity is the one that matters.

Coffee is an acidic drink and a great deal of what you like about a good one is acidity — the brightness, the fruit, the finish. Brew it in water with high alkalinity and that buffer neutralises some of that acidity before it reaches you. The result is not sour or bitter. It is flat. Muted. The cup tastes like a worse version of itself and nobody can name what is missing.

Go the other way — very low alkalinity — and nothing is holding the acidity in check. The same coffee reads as sharp, thin, sometimes sour.

The numbers one manufacturer publishes

La Marzocco publishes a water specification for its machines, and it is the strictest and most complete one we have archived. Their published limits:

Value	Units	Minimum	Maximum
Total dissolved solids	ppm	90	150
Total hardness	ppm	70	100
Alkalinity	ppm	40	80
Chloride	ppm	0	30
Total iron	ppm	0.0	0.02
Free chlorine	ppm	0.0	0.05
Total chlorine	ppm	0.0	0.1
pH	—	6.5	8

Look at the alkalinity row. Forty to eighty parts per million — a forty-point window. That is not much room, and municipal supplies routinely sit outside it in either direction.

These are La Marzocco's numbers for La Marzocco machines. We are not presenting them as an industry standard, because they are not one — but they are published, they are specific, and if you run a different make the equivalent table is in your own manual. The full reading of what these figures mean machine by machine is in espresso machine water specs.

Why two cities can be so far apart

Because municipal water is wildly variable, and nobody tells you when you sign a lease.

From utilities' own published reports: Minneapolis averages around 94 ppm hardness. Phoenix runs 172 to 302. Las Vegas around 280. Denver, despite its reputation, comes in around 105. Indianapolis ranges from 148 to 460 inside the same city — which means two of your own locations across one metro can be meaningfully different from each other.

Those are hardness figures rather than alkalinity, and that is the point: they show how much the underlying water chemistry moves between and within cities. Our hardness hub carries the dated figures with the utility reports linked.

And it moves in time, not just in space. Multi-source systems blend differently through the year. A café whose coffee changes character in spring may be tasting a seasonal source change, not a staff problem.

The softener trap

Here is the mistake that costs the most, and the manufacturer says it out loud.

A conventional salt-based ion-exchange softener does not remove hardness minerals. It swaps them — calcium and magnesium out, sodium in. Your machine sees softer water and scales less. Good.

But the alkalinity is largely untouched, and you have added sodium. So the scale problem improves and the taste problem does not — and may get worse.

La Marzocco puts it this way, verbatim:

"La Marzocco recommends caution when using sodium and hydrogen based ion-exchange water softeners."

That one sentence is the technical reason a water softener is not interchangeable with a filtration cartridge specced for an espresso line. They are solving different problems. Anyone selling you a softener as the answer to a taste complaint has not read the spec.

It is also worth noting that the same manufacturer's installation drawing for the Linea PB lists, in the plumbing callouts, "water filter required (not provided)." The filter is not an accessory on that machine. It is part of the install.

What to actually do

1 · Get both water quality reports. Every utility publishes an annual Consumer Confidence Report, free. Pull the one for the old location and the one for the new one and put them side by side. You are looking for alkalinity, total hardness and total dissolved solids.

2 · If the report is vague, test. Many reports give hardness and skip alkalinity. A commercial water test kit gives you both at your actual tap, which is better than a city-wide average anyway.

3 · Match the filtration to the gap, not to the category. If the new site's alkalinity is high, you need something that addresses alkalinity — which is a different cartridge from a taste-and-odour block, and different again from a softener. If it is low, that is a harder problem and may mean remineralisation.

4 · Stop adjusting the recipe first. Grinding finer to chase body in water that is buffering your acidity away will make a heavier, duller cup. You will be solving a water problem with a grind setting, and every bag will fight you.

5 · Rule out the disinfectant too. If the new city uses chloramine and the old one used free chlorine, that is a separate taste problem with a separate fix — chloramine vs chlorine covers why the same cartridge may not handle both.

Send us both cities

Give us the two addresses, the machine make and model, and what changed about the cup. We will pull both utilities' published figures, compare them against the manufacturer's own published specification, and tell you whether the water explains what you are tasting.

If it does not, we will tell you that too, and you can go back to looking at the beans with one variable properly eliminated.

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