Water Quality InformationWritten By Actual Experts

What Are Heavy Metals?

Chemists categorize heavy metals as elements that are at least five times denser than water. Examples of heavy metals include: cobalt (Co), copper (Cu), chromium (Cr), iron (Fe), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni), selenium (Se), zinc (Zn), arsenic (As), mercury (Hg), and lead (Pb). Some heavy metals are essential minerals for healthy biochemical and physiological functions. Others, such as lead, chromium, arsenic, and mercury are toxic even when ingested in very small quantities. Elemental density and toxicity are interrelated. Arsenic, which is technically categorized as a metalloid (think of a metalloid as metal-like), is quite dense and is extremely toxic in very small quantities. Thus, toxicologists typically categorize arsenic as a heavy metal. Due to their shared high degree of toxicity, lead, cadmium, chromium, mercury, and arsenic are cause for significant public concern.

How Are We Exposed To Heavy Metals?

People can be exposed to heavy metals through ingestion, inhalation, or contact with skin. The severity of the health effects of heavy metals is related to the type and chemical form of each particular contaminant, and is also depends on the exposure time and dose.

Heavy metals have industrial, domestic, agricultural, medical and technological applications, and as a result they are now widespread in our environment. Heavy metal pollution in water is very high in areas where mining, smelters, metal processing refineries, wood preservation, and paper processing facilities are located. Human exposure to heavy metals as well as public concern for the associated health risks have both risen dramatically as a result of an exponential increase of their use in these various applications.

If Heavy Metals Are Toxic, Why Are They Found In Multi-Vitamins?

Some heavy metals including cobalt (Co), copper (Cu), chromium (Cr), iron (Fe), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni), selenium (Se) and zinc (Zn) are essential minerals that are necessary for various biochemical and physiological functions. They serve as components of several key enzymes and play important roles in various oxidation-reduction reactions in our bodies. Many of these metals are found naturally in the food we eat, while other foods are fortified with these minerals. For example, almost all grain products (cereal, bread, crackers, etc) are fortified with iron. Inadequate supply of these minerals can result in a variety of deficiency diseases. For example, anemia (red blood cell deficiency) can result from low iron. Supplements can prevent or treat diseases resulting from mineral deficiency.

Not all heavy metals are toxic in low quantities, however all heavy metals (yes, even the good ones) can be toxic if too much is ingested. Each heavy metal’s toxicity depends on dosage, method of exposure, age, gender, genetics, and nutritional status of the exposed individual. An excess amount of any particular heavy metal produces cellular and tissue damage leading to a variety of adverse effects and human diseases. For some including chromium and copper, there is a very narrow range of concentrations between beneficial and toxic effects, so be careful when taking supplements. Other metals such as aluminium (Al), antimony (Sb), arsenic (As), barium (Ba), beryllium (Be), bismuth (Bi), cadmium (Cd), gallium (Ga), germanium (Ge), gold (Au), indium (In), lead (Pb), lithium (Li), mercury (Hg), nickel (Ni), platinum (Pt), silver (Ag), strontium (Sr), tellurium (Te), thallium (Tl), tin (Sn), titanium (Ti), vanadium (V) and uranium (U) have no established biological functions and are considered non-essential metals in our diet.

What Is Heavy Metal Toxicity Or Heavy Metal Poisoning?

Each metal differs in how it behaves in our bodies, and exposure alone does not always cause disease or harm. Heavy metal-induced toxicity and carcinogenicity involves many biochemical processes, some of which are not clearly understood. The human body’s natural response to heavy metal exposure is to store them and slowly excrete them over time to minimize organ damage.

Acute heavy metal poisoning usually occurs when people are exposed to large amounts of one particular metal at a time. For example, a child swallowing a lead bullet can cause a large amount of lead exposure all at once. Acute exposures can quickly cause serious health effects or death.

Chronic or long-term exposure to lower levels of heavy metals can also cause health problems. The symptoms of chronic heavy metal poisoning can be severe, but are often less obvious and develop much more slowly over time than the symptoms caused by acute exposure. This is a topic of growing scientific evidence that needs to be better researched to clarify all the possible health implications. Chronic heavy metal poisoning can be challenging for both health care providers and patients because there are often many more questions than answers. Symptoms of chronic heavy metal toxicity can include but is not limited to headaches, fatigue, muscle and joint pain, and weakness. However, these same symptoms can be caused by many other health problems unrelated to heavy metal toxicity. True chronic heavy metal poisoning is rare but also difficult to diagnose.

What Are The Health Effects Of Heavy Metal Toxicity?

Even in very low quantities, lead, cadmium, chromium, mercury, and arsenic are known to induce cardiovascular diseases, developmental abnormalities, neurologic and neurobehavioral disorders, diabetes, hearing loss, hematologic and immunologic disorders. These heavy metals are also classified as human carcinogens (known or probable) according to the U.S. Environmental Protection Agency, and the International Agency for Research on Cancer.

Although the acute and chronic effects are known for some metals, little is known about the health impact of mixtures of heavy metals. Studies have shown that toxic heavy metals can interfere with absorption and use of nutritionally essential metals such as iron, calcium, copper, and zinc. However, the research on the combined effects of heavy metal exposure is very limited.

How Can I Minimize Exposure To Heavy Metals?

The best way to reduce heavy metal pollution is prevention. Identify sources of heavy metals in your home and remove them. Here are some helpful suggestions:

• Be aware of local fish advisories for mercury contamination.
• Test the water in your home for heavy metals and install a home water filtration system if necessary.
• Read labels on products coming in to your home.
• Store products containing heavy metals out of reach of children.

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Rebecca Labranche | Laboratory Director, A&L Laboratory

How Is Drinking Water Regulated?

The Environmental Protection Agency (EPA) sets regulatory limits for over 90 contaminants in water provided by public water systems. The EPA sets these limits in accordance with the Safe Drinking Water Act to protect public health in the communities that are using this water. The EPA limits are divided into two main categories. National Primary Drinking Water Regulations are legally enforceable standards that apply to public water systems. Primary standards protect public health by limiting the levels of contaminants in drinking water that negatively affect human health. National Secondary Drinking Water Regulations are non-enforceable guidelines regulating contaminants that may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water. EPA recommends secondary standards for water systems but does not require systems to comply. In addition to the federal EPA standards, The Safe Drinking Water Act (SDWA) gives individual states the opportunity to establish their own drinking water standards if they are not more lenient than those set by the EPA's national standards.

So how do these federal and state regulations affect private well-owners? These same limits and guidelines used for public water are also adopted by most institutions and lenders for home water testing as a way to determine if the property provides potable, safe water. When a home goes up for sale, if the buyer is financing, they will likely be required to test the water. While lenders may be concerned about a potable water source in order to protect their investment, there are no official rules or regulations for determining potability of private wells. Many states and towns do not even require sampling of private wells after installation. It is the responsibility of the homeowner to maintain their well and water supply. 

How Often Should Home Water Testing Be Conducted?

Private well water should be tested a minimum of once per year. Drinking water supplies obtained from shallow dug wells and surface water sources should be tested more frequently as they are more susceptible to contamination. Annual testing of both dug and drilled wells should check for the most common contaminants which are bacteria, nitrates and nitrites. Even if your water has consistently been safe to drink in the past, these parameters could change without you knowing, and affect the safety of your water. New drilled wells should be tested with a more comprehensive water test which includes bacteria, nitrates, nitrites, metals, minerals and radon. This test identifies many common primary and secondary contaminants typically found in the bedrock surrounding the well. This comprehensive test should be repeated every 3 – 5 years to ensure the well is still providing safe water.

What Are The Most Common Types Of Drinking Water Contaminants?

Drinking water contaminants can be divided into several categories: Inorganic Chemicals, Organic Chemicals, Radionuclides and Microorganisms. Testing for every possible analyte would be prohibitively expensive but we have put together a comprehensive test package which covers common problems found in our area.

Laboratories throughout the United States will offer similar packages based on the geology in their area.

What Is The Process For Analyzing Drinking Water?

The process of analyzing drinking water varies by laboratory and their methods used. However, the basic premise is the same for all of them. The first step is to obtain a water test kit from the certified drinking water laboratory that you intend to use for the analysis. Home water testing kits are specific to each laboratory and their methods so it is important not to use another laboratory’s bottles. These test kits come with all the information that is needed to collect the sample and get it back to the laboratory in the required time frame. The sampling instructions are usually step by step and easy to follow. Once the water is received by the laboratory it will be analyzed for the requested parameters and a report will be generated and sent back to the client. The typical turn-a-round time for a comprehensive water test is 2-3 business days.

Using a certified laboratory is very important. They are monitored by their state and undergo periodic inspections to ensure that they are producing the highest quality data. During these inspections their instruments, standard operating procedures, lab technicians, quality control documentation and reporting procedures are reviewed and evaluated. If anything is found to be out of compliance certification for the laboratory can be revoked. In addition to inspections, they also have to complete proficiency tests for each method they conduct to prove that they can perform the method properly and obtain results within the specified limits.

What Are The Risks Associated With Consuming And/Or Using Contaminated Water?

The risks vary greatly depending on which contaminants you have in your water. Common health effects include gastrointestinal illness, reproductive problems, neurological disorders and cancer. These health problems pose a greater threat to young children, pregnant women, the elderly, and people with compromised immune systems. The health effects of drinking contaminated water can range from no physical impact to severe illness or even death.

Some of the effects of drinking contaminated water are known almost immediately. Immediate health related issues generally stem from contamination by pathogens such as total coliform and E.coli. Symptoms include gastrointestinal and stomach illnesses such as nausea, vomiting, cramps, and diarrhea.

Other contaminants pose health effects that may not be observed for many years. Some of the most common ones are:

Arsenic in water occurs naturally as well as from industrial activities. Studies have shown that chronic or repeated ingestion of water with arsenic over a person’s lifetime is associated with increased risk of cancer (of the skin, bladder, lung, kidney, nasal passages, liver or prostate) and non-cancerous effects (diabetes, cardiovascular, immunological and neurological disorders).

Lead can occur due to corrosion of lead containing household plumbing and by industrial pollution. Major toxic effects include anemia, neurological dysfunction/damage and renal impairment.

Uranium is a tasteless, colorless, odorless contaminant. Drinking water with uranium amounts exceeding 30ug/L can lead to increased cancer risk, liver damage, or both.

Copper has both long term and short term effects. Some people with short term exposure, experience gastrointestinal distress, and with long-term exposure may experience liver or kidney damage. It is typically introduced into the water from household plumbing systems.

Fluoride has been shown to reduce tooth decay in children's teeth if they receive an adequate level. The optimal concentration, as recommended by CDC is approximately 1.1 mg/L. In the range of 2.0-4.0 mg/L of fluoride, staining of tooth enamel is possible. Above 4.0 mg/L, studies have shown the possibility of skeletal fluorosis, as well as the staining of teeth.

Radon is the second leading cause of lung cancer. High levels of radon gas occur naturally in Maine soil and water, and can move up into a house from the ground. The house then traps the radon in the air inside. Radon gas can also dissolve into well water, which is then released into the air when you use the water.

What Should I Do If The Laboratory Finds Something In My Water?

If tests on your water indicate problems, the next step is to determine what type of system you need to treat the water. This can be a difficult decision because there is a wide variety of water treatment devices on the market today. Water purifiers range from relatively low-cost, simple filter devices for a kitchen faucet to more expensive, sophisticated systems that treat water from its point of entry into a home. Keep in mind, no one water treatment device can solve every problem.

Rebecca Labranche is the Laboratory Director for A & L Laboratory. A & L Laboratory specializes in drinking water analysis for both public systems and private wells throughout the State of Maine.

Editor's Note: Since this article was first written, more drinking water contaminants have gained attention in the news.These include Per and Polyfluoroalkyl Substances (PFAS), which have recently become Federally regulated in drinking water. If you want to get your water tested and are unsure of what to request, feel free to contact our Water Nerds at hello@hydroviv.com. We can discuss your water concerns and help you prioritize which contaminants to test for.

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Eric Roy, Ph.D.  |  Scientific Founder

Since The Environmental Working Group recently released a report about the prevalence of chromium-6 in drinking water supplies, our email and support line have been filled with questions about the toxic heavy metal. The purpose of this article is to address a lot of these FAQs, including the answer to "what is chromium-6?," and to discuss how to remove chromium 6 from drinking water.

Is Chromium-6 the Same Thing as “Regular” Chromium?

No. So what is chromium-6? Chromium comes in a variety of chemical “flavors.” Most forms of chromium (e.g. chromium metal, trivalent chromium) are not toxic. These are the types of chromium used to make stainless steel and are found in dietary supplements. There is no reason to be throwing away stainless steel cookware!

Chromium-6 (or hexavalent chromium), on the other hand, is an extremely toxic form of chromium, and is known to cause cancer, even at very low concentrations. In popular culture, chromium-6 is the chemical that was at the center of the Erin Brockovich story, which was made into a movie starring Julia Roberts.

Where Does Chromium-6 Come From?

Unfortunately, chemicals containing chromium-6 are useful in a number of industrial processes, which means that chromium-6 can enter drinking water supplies through waste streams that enter rivers and ground water. Industries that generate chromium-6-containing waste include: steel production, leather tanning, textile manufacturing, wood preservation, and electroplating.

How Is Chromium-6 Regulated?

It's not. In 1991 EPA set a Maximum Contaminant Level (MCL) for total chromium (all kinds) in drinking water of 200 parts per billion. The structure of this regulation is flawed because it treats non-toxic forms of chromium in the same manner as highly toxic chromium-6. To put it in perspective, California (which has tighter regulatory conditions that the EPA) has set a proposed limit of 20 parts per trillion for chromium-6, a level that is 10,000 times lower than what the current EPA regulation is for total chromium. Part of the challenge in formulating a proper regulation is that advanced detection procedures and equipment are required to measure things at part per trillion concentrations.

Are the Recent News Articles the Result of a Recent Spike in Chromium-6 Concentrations?

No. There is no sudden rise in chromium-6, the media coverage is just shining light on an existing situation.

What Can I Do To Reduce Exposure To Chromium-6?

Unlike lead, which leaches into water from pipes, chromium-6 comes from the source water itself, so flushing pipes does not reduce concentrations of chromium-6 in drinking water. Boiling water also does not reduce/remove chromium-6.

If you want to remove chromium-6 from your water, you need to filter it using a high end water filter. Filtration pitchers and common fridge filters DO NOT filter chromium-6 from water. A new generation of water filters that use chromium 6 removal media are extremely effective at filtering chromium-6 (and other contaminants) from water. Reverse osmosis is also a viable way to remove chromium 6 from water for people who are willing to accept the drawbacks, including low flow rate. We recently wrote a more in depth article on how to filter chromium 6 from water.

If you have any questions about filtering chromium-6 from your water, we encourage you to take advantage of Hydroviv’s “Help No Matter What” approach to technical support, where we will help you select an effective water filter system, even if it’s not one that we sell. This free service can be reached by emailing support@hydroviv.com

Update April 23, 2017: We have published an article specifically on how to filter chromium 6 from drinking water. See it HERE

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Roughly 15 percent of Americans get their tap water from private wells, and this percentage can rise to 40% in rural states like Maine and Vermont. It's no surprise that we receive a lot of questions from people with wells who are are concerned about water quality.

1. Getting A Well “Checked” Is Not The Same As Comprehensive Water Testing

There is a misconception that if someone gets their private well “checked,” it will reveal water quality problems. Unfortunately, that’s not the way it works. A basic water screening has a lot of "blind spots" and gives no information about levels of lead, arsenic, chromium 6, mercury, or VOCs unless you test specifically for those chemicals. Some states have certain testing requirements, but the scope of testing varies from state to state, and most states do not require comprehensive testing. Many banks require that certain water tests be conducted before they will issue a mortgage, but the goal of this testing is often to ensure that there are no faulty systems in the home, not to protect the health of the residents.

Bottom line: The well's owner is responsible for having tests run. Don't assume that the tests that were done as part of the home buying process were comprehensive.

2. Well Water Contamination Often Comes From Natural Sources, Not Humans

Some private well owners are surprised to learn that they have contaminated water, because there are no obvious contamination sources nearby. This is because some contaminants (like arsenic) can occur naturally groundwater at unsafe levels. 

3. Well Water Is Often Corrosive & Can Leach Lead From Plumbing

The lead crisis in Flint put a spotlight on the fact that corrosive water can leach lead from pipes, soldered joints, and plumbing fixtures. Unfortunately, a lot of well owners don't realize that well water can be inherently corrosive, so if a their plumbing predates 2014, (when lead-free standards were fully adopted for home plumbing components) there is potential for lead to leach into the tap water.

4. Contaminant Concentrations (And Recognized Safe Levels) Change With Time

We cannot emphasize enough that people should get their wells tested on a regular basis, because contaminant concentrations and thresholds for “safe” water both change over time.

5. Private Well Owners Are Responsible For Monitoring Their Water Quality, Not EPA

Private wells are not regulated by EPA or State Regulators, so the owners (or prospective owners) are responsible for all well water quality testing. However, figuring out which tests to do and making sense of the results can be confusing. Some states have guidelines and recommendations, but even these can be confusing and contradictory.

Often times, prospective home owners turn to a real estate agent for advice on water quality testing, but we often hear from people who received terrible advice. Most of the time, the mistakes are honest, but there are times when it looks like the agent was trying to facilitate a quick sale.

Ultimately, ensuring water quality of a private well is the individual responsibility of the well’s owner or prospective owner. In support this responsibility, we encourage people to take advantage our Technical Support Team’s “Help At All Costs” policy, and lean on us to provide guidance on which lab to select in your area, which tests to run, and to help interpret the results. This free (no obligation service) can be reached by emailing us (support@hydroviv.com) or by using the live chat function on this page.

We do not have financial agreements or arrangements with water quality test labs, and we do not “over-prescribe” testing.

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5 Things You Need To Know About Chromium 6 In Drinking Water
Why TDS Meters Don't Tell You Anything About Lead Contamination
Does Boiling Or Freezing My Water Purify It?

Eric Roy, Ph.D.   |  Scientific Founder 

Since a nationwide story broke about widespread chromium 6 (also known as hexavalent chromium) contamination impacting about 200 million people in the US, we have been getting a lot of questions about the toxicity, regulation, and removal of the carcinogen from drinking water. This article discusses the only effective ways to remove chromium 6 from drinking water.

There Are Two Effective Ways To Filter Chromium 6 From Water:

1. Cartridges With Chromium 6 Filter Media

Certain types of filtration media are extremely effective at removing chromium 6 from water. They can be blended with other types of filtration media, and built into cartridges that remove chromium 6 as water flows through them. The advantages to this approach over reverse osmosis include: better flow rate, easier to install, and less expensive to maintain. Obviously, we are partial to our under sink water filtration system, but there are other high-end competitors that build quality chromium-6 water filter systems using the same approach successfully (albeit at double the price than Hydroviv).

2. Reverse Osmosis

The other way to effectively filter chromium 6 from drinking water is using a properly maintained reverse osmosis (RO) system. In addition to the common complaints of RO users, it’s critical to diligently replace the pre-filtration cartridges, because if not, the RO membrane can become compromised, rendering the system ineffective. 

Myths About Chromium 6 Removal

Contrary to the words & advice of certain internet naturopathic gurus, boiling, freezing, adding Himalayan sea salt or coconut oil to your water does NOT remove chromium 6 from water, or lessen/reverse the toxic effects of it.   

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