Summer is prime time for buying bottled water in bulk (though both you and the planet would be better off if you used refillable water bottles instead). But before you reach the checkout line, check out the brand of water you’re about to purchase. Several have been recalled recently.

Niagara Spring Bottle Company has issued a voluntary recall of spring water bottles produced at two of its Pennsylvania plants between June 10 and 18. The reason: An operator at Niagara failed to inform the company that E. coli has been found at the water source.

Although no bottles of water have been found to harbor E. coli, the company has already shut down operations in Pennsylvania plants (Allentown and Hamburg), and has begun disinfecting procedures at their bottling lines.

Similarly, while there have been no reports of illness or injury from drinking Niagara water, the company is urging consumers to take precautions by boiling affected water for one minute and letting it cool before using it. Recalled bottles can also be returned to stores for a full refund.

Related: Why You Should Break Your Bottled Water Habit

How to spot contaminated water

Niagara bottling recall graphLook for Niagara Bottling LLC on the label on water bottles with the following brand names:

  • 7-Eleven
  • Acadia
  • Acme
  • Big Y
  • Best Yet
  • Morning Fresh
  • Niagara
  • Nature’s Place
  • Pricerite
  • Shaw’s
  • Shoprite
  • Superchill
  • Western Beef Blue
  • Wegman’s

Then check out the code. The only potentially affected water bottles have codes that begin with the letter F (for Hamburg) or A (for Allentown). The first digit after the letter indicates the number of the production line. The next two numbers indicate the day, then the month in letters, the year, and then the time, based on a 24-hour clock.

Production where the recalled spring water products occurred between 3 a.m. EDT on June 10 to 8 p.m. EDT on June 18, 2015, Niagara stated.

For example, the following code could be recalled: A610JUN15 2000  (Photo: Niagara Water Recall/Niagara Water)

Related: Is it Safe to Drink the Water on a Plane?

What’s the risk?

According to the Centers for Disease Control and Prevention, E. coli can cause diarrhea or illness outside of the intestinal tract. It can be transmitted through contaminated water or food. The symptoms often begin slowly with mild belly pain or non-bloody diarrhea that worsens over several days. Infants, young children, elderly people and those with compromised immune systems are especially at risk.

For more information, contact Niagara Bottling LLC Consumer Service at (877) 487-7873 or visit http://www.niagarawater.com/.

You can download the full list of codes for recalled water bottle cases here.

Related: Got Diarrhea? The Feel-Better-Fast Treatment Guide

Muriel Vega is a writer with a passion for budget travel and staying safe while abroad. A Georgia State University graduate, she has over 6 years of editorial experience and has written for The Guardian, The Atlantic, The Billfold, among other outlets. In her free time, you can find her baking pies, playing with her two dogs and cat, or planning her next vacation. She spends way too much time on Twitter, one of her favorite social media channels. Her favorite safety tip: Make sure you have all the necessary shots before you go abroad.