What's in My Tap Water?

Woman holding glass of water

Most people in the United States have access to water straight from the faucet in their homes and public places such as restaurants and cafes. But, what is in the stuff we drink every day?

What is its source? Are the treatments effective? And, is it safe to drink?

In this article, we'll be taking an in-depth look at the quality and content of drinking water in the United States, investigating its sources, filtration processes, and how it measures up to bottled or filtered options.

Read on to find out more about this essential — but often overlooked — diet staple.

a glass of tap water

What is in Tap Water & And Is It Safe to Drink?

Before we delve into the details of this topic, it's crucial to note that, in general, water from the average tap is relatively safe for consumption in the U.S.

Thanks to federal laws and regulations, this water passes through several treatment stages that are monitored for safety. The resulting product - our drinking water - meets high standards and is generally considered to be safe and healthy, with some notable exceptions.

There are some issues with tap water contaminants in this country, including local issues in rural areas, or areas like Flint, Michigan.

There is also a lot that we don't yet know about its long-term health impacts, such as the effect of microplastics or the low doses of nitrates present in the supply.

Other issues arise from the treatment processes, such as THMs, or trihalomethanes, chemical compounds formed when treating H20 with chlorine.

pitcher full of tap water

Should I Drink Tap Water?

According to a report by the Natural Resources Defense Council (NRDC), 85% of the U.S. population has access to safe drinking water. That leaves 15% affected by contaminants in their tap supply.

According to Neilsen Research Corporation, the most common contaminants in water after filtration and treatment include:

  • Uranium
  • Herbicides
  • Aluminum
  • Arsenic
  • Lead
  • Copper
  • Iron
  • Pesticides

Pharmaceuticals can enter the sewage system when flushed down the toilet or passed in human excrement. According to WHO research, they have found trace amounts in municipal sources.

The long-term effects of consuming trace pharmaceuticals remain unverified, but the WHO warns that this is not something that anyone should drink daily.

Each city's supply is different, and it will contain a unique combination of contaminants. Check your local area by entering your zip code in the Tap Water Database by the EWC.

Ultimately, the quality and content of what comes out of the tap are subject to regulation by the Environmental Protection Agency (EPA). Through the federal Safe Drinking Water Act, they have set limits on 90+ contaminants in the supply in the U.S.

However, this policy is only applicable to public systems that serve 10,000 people or more. Smaller — and often rural — communities do not count in this act's regulations.

Also, they only monitor the supply every five years for just 30 contaminants, under the Unregulated Contaminant Monitoring Rule (UCMR).

Potomac River

What Is In My Tap Water’s Sources?

There are three primary sources of water in the country: groundwater, rivers, and lakes. The source of your specific tap supply depends on where you reside.

Some cities rely on lakes and rivers as their source for municipal tap supplies. Others, such as Boston, rely on reservoirs.

Some cities and their reserves in the U.S. include:

  • New York gets 90% of its supply from the Delaware River Basin.
  • 100% of drinking water in Washington DC comes from the Potomac River.
  • Most of the 4.1 million residents of Atlanta get their tap supply from the Flint and Chattahoochee rivers.
  • New Orleans collects its tap supply from the Mississippi River.
  • Half of the H20 in Los Angeles comes from the Owens River.
For more information on water resources and where tap water contaminants may come from, check out the list of resources compiled by the American Rivers

    While rivers and lakes are a substantial source of tap supplies in this country, much of what we drink comes from groundwater. These underground aquifers contain water that originates from rain that seeps into the soil.

    Natural aquifers may contain water that is thousands of years old. We can access these resources via natural springs or wells.

    water treatment process

    How Is Tap Water Filtered and Treated?

    Unless you get your water from a private well, your main supply will come from one of the nation's 150,000 public water systems. This water will undergo processing, filtration, and sanitization at a treatment facility before it reaches your faucet.

    The steps of this treatment process are as follows:


    Water gets to the treatment plant through a series of pipes and pumps. Most treatment centers for municipal systems that provide tap water use gravity to aid this process, and are placed in strategic locations to aid this goal.


    Water goes through an initial screening when it reaches the treatment area. This process usually consists of a large metal screen, designed to trap large debris such as fish, trees or branches, plants, and trash.

    Coagulation and Flocculation

    Coagulation and flocculation take place to bind small particles in the water together and filter them out. The treatment centers achieve this process by adding chemicals with a positive charge (known as coagulants) to the supply.

    Common coagulants include ferrous sulfate, aluminum sulfate, and activated silica. These bind to the negatively charged dirt particles and form much larger particles called floc. This kind of tap water contaminant is easier to catch and eliminate.

    Sedimentation and Clarification

    This stage in the treatment process will filter out the floc particles. The system pumps floc into a sedimentation point, while the rest of the water moves on to the next stage of treatment.


    Some treatment systems will add highly reactive gas ozone to the supply. When pumped through the water, it will kill viruses and bacteria. It also can reduce the concentration of iron and sulfur.

    It also helps break down pesticides and eliminate foul odors.


    Most of what is in tap water that the human eye can see are removed during filtration. In this stage, the water goes through filters to remove remaining particles (such as dust and microorganisms).

    These filters usually consist of gravel, sand, or activated charcoal.


    Finally, water disinfection takes place using chlorine gas or a chlorine compound. This step ensures the elimination of any remaining microbial contaminants from the supply. Some treatment centers also add fluoride for dental health.

    bottled water vs tap water

    What Is Better: Bottled Water vs Tap Water vs Filtered Water?

    While many people think that bottled water is a safer, healthier option than tap, this often isn't the case.

    Not only do bottles increase energy usage and plastic waste, but the stuff in the bottles also hasn't proven to be consistently safer for human consumption than what you get out of your faucet.

    At parks, businesses, and in your apartment or home, water from the tap is subject to regulation by the EPA. Bottled H20 is under regulation by the FDA, which has different guidelines and more of a focus on labeling. Does this make it the same as tap water?

    Research has shown that PET and BPA from plastic can contaminate the water in warm conditions. Also, what you get in bottles is often just repackaged from municipal lines.

    In many cases, bottled water companies sell you a product that you could access for free in your own home.

    A better option is filtered water. Filters can remove much of the contaminants from your tap, and it is an economically more efficient alternative to bottled. It's better for the environment, too!

    Depending on the filter you buy, you can eliminate up to 99.999% of particles.

    Bottom Line

    It’s not a bad idea to wonder what is in your tap water. In general, drinking it is safe in most US neighborhoods, but it’s far from perfect. Municipal water treatment plants are more interested in stopping everything they can rather than being selective.

    That means that along with all the bad stuff they eliminate, they can reduce or eliminate things that make tap water more beneficial for people.

    AquaBliss products are designed to put some of that good stuff - like healthy minerals - back into hard water. AquaBliss filters can reduce the negative effects of hard water.

    They can add minerals that reinvigorate your hard water supply, especially for your shower!

    Municipal water processing often infuses the water with lots of harsh chemicals that disinfect and remove tap water contaminants before they reach your home.

    Let AquaBliss water filters bring that water back to life with an infusion of beneficial minerals. Contact a representative now, and start experiencing the combating hard water effects today!

    Unhappy With Your Product? We'll Take it Back!

    We stand by our high-quality products and your statisfaction is 100% guaranteed by our 30-day Money-Back Guarantee

    Secure Checkout

    We use encrypted SSL security to ensure your credit card information is 100% protected.