While we can't guarantee that any kombucha brewed outside our facility is safe to drink, there are some clear indicators of a healthy brew for you to consider. The pH - or acidity level - of kombucha acts as a protective factor against harmful bacteria. This means that as long as the kombucha's pH is lower than 4.2 - and your SCOBY has no visible mold on or in it - it should be safe to drink, since the acidity kills any harmful microbes. You can purchase pH test strips online if you’d like to test your kombucha. Remember, kombucha is brewed using a centuries-old fermentation process. While that doesn’t guarantee that your kombucha is safe to drink, as long as all signs point to safe, it should definitely boost your confidence! Read more about pH and acidity level here.