Lake Como Tap Water: Can You Drink It?

On the Como side, Como Acqua is the public operator. Its scale is published on its own pages and it is larger than most visitors imagine, which is worth knowing because a network this size does not run on goodwill. On the Lecco side, Lario Reti Holding covers every comune in the province and puts its emphasis on the laboratory rather than on a public table of values.

Como Acqua's published thresholds are the legal limits rather than a single reading: hardness below 200 mg per litre, pH between 6.5 and 9.5 at 20 degrees, nitrates below 50 mg per litre, sodium below 250 mg per litre. It also tracks conductivity, turbidity, dry residue, ammonia, chlorides, sulphates, heavy metals including lead, cadmium, mercury and arsenic, and bacterial indicators. The values themselves are published per comune, so Bellagio's numbers are Bellagio's, not an average, and you look up the town you are standing in.

Lario Reti's laboratory is accredited to ISO 17025 for 20 tests, 7 of them for drinking water and 14 for wastewater. Its published drinking-water microbiology covers coliform bacteria, E. coli, viable microorganisms at 22 degrees and microcystins, among others. It does not print an annual sample count and it does not carry a plain drinkability statement on the laboratory page, which is a gap in the publishing rather than in the water.

Como Acqua's casette charge 2 cents a litre for still water and 4 cents for sparkling, paid with a free card issued at its Cantu and Lurate Caccivio offices or through a mobile app that reads a QR code on the machine. Every location it lists sits inland in the Brianza belt: Cabiate, Capiago Intimiano, Cantu, Lomazzo, Bregnano, Cermenate, Rovellasca, Cadorago, Rovello Porro, Guanzate, Mozzate and Locate Varesino, with the Mozzate machine temporarily out of service. Not one of them is on the lake shore, and there is none in the city of Como.

Lario Reti's network is the useful one for a visitor. It lists 36 casette across the Lecco province and the lakeside towns are genuinely on it: Bellano, Lecco, Colico with two, Mandello del Lario with two, Lierna, Oliveto Lario, Abbadia Lariana, Pescate and Malgrate. Varenna is not. The card costs €5.00 and arrives with €2.00 of credit on it, some older machines still take cash, and the price per litre is displayed at each kiosk rather than published centrally. The operator's own counter showed 630,459 litres dispensed since the start of the year, updated daily by telemetry.

So the honest advice for a Lake Como trip is the opposite of the Florence or Rome version: do not plan your day around public fountains, because on the busiest shore there are none. Fill your bottle where you slept, top it up at a bar with a glass of tap water when you buy a coffee, and treat a casetta as a happy accident if your day happens to pass one. If your base is Varenna that is not optional advice, it is the only option, and the guide to the lake explains how the shores differ on every other practicality too.

Bottled water at an Italian table is custom and margin, not regulation. The waiter will ask naturale o frizzante, still or sparkling, and bring a bottle unless you head it off. The phrase is acqua del rubinetto: tap water. A neighbourhood trattoria will usually pour it; a lakefront place with a view of Bellagio may say bottled only, which is allowed, mildly annoying, and not worth a scene.

The coperto beside it on the bill is the cover charge, and it is worth stating clearly that no comune on this lake, no Regione Lombardia act and no trade body publishes a rate or a ceiling for it. Italian law requires the charge to appear on the menu; the amount is the restaurant's own. Anybody printing an average coperto for Lake Como is quoting a survey, not a rule, and this guide will not join them. Read the menu board before you sit down, which is the same advice where to eat gives at greater length and what is open when on Lake Como repeats for every gate on the lake.