Ah, the simmer. It’s for soup, not for germ warfare. If you only get the water to a gentle, lazy simmer (around 180°F), you’re giving E. coli a spa day, not a funeral. Don’t do it. You need that full, roaring, “I’m about to whistle at you” boil. That’s the sweet spot. The bacteria don’t stand a chance.
Does Boiling Water Kill E Coli Bacteria at Janelle Hernandez blog
And yes, once the water is boiling, you can turn off the heat. The heat that was already absorbed is more than enough to finish the job. You’re basically a water ninja.
But Here’s the Catch (Isn’t There Always One?)
Boiling kills the bacteria. It does not remove toxins they might have already left behind. If the water had a ton of E. coli in it and they pooped out some nasty chemicals (called heat-stable toxins), boiling won’t magically erase those. It’s like cleaning a crime scene—the perp is gone, but the mess remains.
That said, for most tap water, this isn’t a huge worry. The bigger danger is contaminated well water or water from a questionable stream. If you’re boiling to make it drinkable, you’re on the right track. Just don’t expect boiling to scrub out heavy metals or pesticides. That’s a different kitchen superhero (like a filter).
How Long you Must Boil Drinking Water to Kill Bacteria
