Storing water improperly, reusing dirty containers, and failing to maintain water filtration systems can make water unsafe to drink. The Johns Hopkins University Water Institute found that ambient temperature along with exposure to sunlight may promote the proliferation of microbes in a water bottle or glass. Toxic chemicals such as BPA and phthalates can leach out of plastic into water as well, posing a serious health risk. Clean out holding tanks to prevent the overgrowth of microorganisms that may contaminate water.

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