Natural water sources are vulnerable to all manner of natural pathogens. These include any bacteria, viruses, and parasites normally found in water or shed from nearby flora and fauna, such as Legionella and Giardia lamblia. They also can easily pick up environmental contaminants and naturally occurring hazards such as radiation from certain mineral deposits. Under the Safe Drinking Water Act, the EPA has set standards and regulations for 90 different contaminants in tap water, including microorganisms, disinfectants, and radionuclides. And for bottled water, the Food and Drug Administration has set standards and can inspect bottling facilities. But such assurances aren’t in place for scouted spring water.