Can you boil lake water and drink it?

Never drink water from a natural source that you haven't purified, even if the water looks clean. Water in a stream, river or lake may look clean, but it can still be filled with bacteria, viruses, and parasites that can result in waterborne diseases, such as cryptosporidiosis or giardiasis.

nps.gov - Two Ways to Purify Water - National Park Service

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The final step of purification is disinfecting the water which can be done by either boiling or treating with a disinfectant. This is the most important step as these methods will kill any remaining organisms in the water, especially those that could make you sick.

Boiling:

Boiling is the best way to kill disease-causing organisms, including viruses, bacteria, and parasites. The high temperature and time spent boiling are very important to effectively kill the organisms in the water. Boiling will also effectively treat water if it is still cloudy or murky. If you’re at an elevation below 6,500 feet, put the water in a container over a heat source, such as a campfire or propane stove, and bring to a rolling boil for 1 minute. If you’re at an elevation over 6,500 feet, bring the water to a rolling boil for 3 minutes. Your water is now ready for drinking! You can make tea or coffee if you like it hot. Let it cool down first before you put it into your container.

Disinfection:

Disinfection happens when a chemical or UV light is added to water to kill bacteria, viruses, and other potentially harmful organisms. Many factors can impact the effectiveness of these methods including water temperature, pH, and cloudiness. With disinfectants, it is important to allow the chemical or UV light enough time to treat the water and kill the organisms before drinking – this is called contact time.

Chemical Disinfection

Chemical disinfection involves adding one or more chemicals to your filtered water that are effective at killing waterborne organisms. Chemical tablets or liquid drops are the most common ways to disinfect natural water. Iodine or chlorine dioxide are the most frequently used disinfection agents. National Sanitation Foundation (NSF) approved products are recommended Follow the manufacturer’s instruction for disinfecting the water. Contact time to disinfect the water varies by product (example: 30 minutes to 4 hours). If the water is cloudy or has floating debris, it will be more effective to pre-filter the water before disinfecting. WARNING: Do not use pool-cleaning tablets to disinfect drinking water! Pool-cleaning tablets are not intended to be consumed. WARNING: Consult with your physician before using any disinfection products. Some tablets or drops, especially iodine, may not be safe for pregnant women, people with thyroid issues or iodine hypersensitivities, or for user over long periods of time.

UV Light Purifiers

Visitors using UV purifiers to disinfect their water

Portable battery-operated UV purifiers can be used to reduce bacteria, viruses and protozoa in water from natural sources. However, these purifiers are only effective in disinfecting small quantities of clear water, are battery dependent and require correct contact time with the water.

To achieve maximum disinfection, make sure you:

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Is rainwater safe to drink?

Germs and other contaminants are found in rainwater. While useful for many things, rainwater is not as pure as you might think, so you cannot assume it is safe to drink.

cdc.gov - Rainwater Collection | Private Water Systems | Drinking Water - CDC

Collecting and using rainwater can be a great way to conserve resources. Some people use rainwater for watering plants, cleaning, bathing, or drinking. However, it is important that the rainwater system is maintained properly and the water quality is appropriate for the intended use.

Germs and other contaminants are found in rainwater.

While useful for many things, rainwater is not as pure as you might think, so you cannot assume it is safe to drink. Rain can wash different types of contaminants into the water you collect (for example, bird poop on your roof could end up in your water barrel or tank). Rainwater can carry bacteria, parasites, viruses, and chemicals that could make you sick, and it has been linked to disease outbreaks. The risk of getting sick from rainwater may be different depending on your location, how frequently it rains, the season, and how you collect and store the rainwater. Dust, smoke, and particles from the air can contaminate rainwater before it lands on your roof. Roofing materials, gutters, piping, and storage materials can introduce harmful substances such as asbestos, lead, and copper into the water. Dirt and germs can be washed into collected rainwater from the roof, especially when rain follows several days of dry weather.

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