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Mercury Contamination in FishEn Español

Protect Yourself and Your Family

With smart food choices you can lower your mercury level in six to eight months; it will take longer to get it out of the fish -- so let's start now.

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Mercury poisoning is a serious problem, but the solutions are fairly simple: in the short term, watch your consumption of high-mercury fish; in the longer term, help force power companies and other giant mercury polluters to switch to pollution-cutting technologies.

The recommendations in this section about eating fish are largely designed for the people most at risk from mercury poisoning: children and women of childbearing age. Other adults may not need to restrict their diets as much, but can use these guidelines to make informed choices.

Avoid Contaminated Fish

Children under six, as well as women who are pregnant or planning to become pregnant, are the most vulnerable to mercury's harmful effects. They should restrict or eliminate certain fish from their diet, including ahi or bigeye tuna, tilefish, swordfish, shark, king mackerel, marlin, orange roughy and fish caught in any waters that are subject to a mercury advisory. Women with elevated mercury levels should ideally begin avoiding or restricting their consumption of mercury-laden fish as much as a year before they become pregnant. (For more, see our guide to mercury levels in fish.)

Restrict Your Portions

In general, a woman who is pregnant or is likely to get pregnant should eat no more than two cans of light tuna per week, or 2/3 of a can per week of white albacore tuna if she wants to stay below the EPA's level of concern for mercury. Keep in mind that the amount of mercury in a single can varies depending on the type of tuna and where the fish was caught. Albacore or solid white tuna is most likely to have higher concentrations, and chunk light tuna, lower concentrations.

Raw tuna and other sushi fish are also something to watch out for. Often the apex predators of the food chain, these fish tend to be high in mercury. Whenever possible, avoid sushi choices that are highest in mercury, using this list as a guide.

Since children get most of their mercury from canned tuna, it is important for parents to limit their children's consumption to less than one ounce of canned light tuna for every 12 pounds of body weight per week, in order to stay below the level of mercury the EPA considers safe. That means that a child who weighs 36 pounds should not eat more than 3 ounces (half a standard-sized can of chunk light tuna) per week. Children should avoid albacore or white tuna because the levels of mercury are higher.

Check Your Mercury Level

To obtain a quick estimate of your mercury intake, use our Mercury Calculator. For a more accurate reading, you can request a blood mercury test from your physician. Women with a high blood mercury level who are planning to start a family may decide to postpone pregnancy for a few months until levels drop; often this occurs within six months.

Stay Informed

The Environmental Protection Agency recently finalized an important set of clean air safeguards to reduce toxic pollution, including mercury, from power plants. Similar standards were adopted for cement plants in 2010. Collectively, these standards would reduce many tons of mercury, cut harmful acid gases, and limit known carcinogens such as arsenic. Moreover, these standards will save thousands of lives and prevent tens of thousands of asthma attacks.

Unfortunately, mercury standards adopted for industrial boilers in 2013 are now the subject of litigation. EPA is also reconsidering portions of the standards it previously issued. As a result, there are currently no national limits on toxic air pollution from industrial boilers -- and these standards are already almost a decade overdue. These industrial facilities are the second largest source of man-made mercury emissions in the United States, and it is critical that EPA craft and implement strong standards that will protect our health and families from this dangerous pollution. Find out more about the fight to save these important mercury reducing measures.

Another way you can learn about and avoid mercury risks is to urge your grocery stores, fish markets and restaurants to label fish accurately and advise consumers about the dangers of mercury in the fish they sell. And be sure to read and print NRDC's mercury guides and to check the mercury calculator.

Photos: top, Getty Images

  • Learn About Mercury and Its Effects
  • Know Where It's Coming From
  • Protect Yourself and Your Family
  • Working to Reduce Mercury Pollution

Mercury Calculator

NRDC's Mercury Calculator

Use NRDC's Mercury Calculator to find out if you're consuming too much mercury.



Mercury in Fish Wallet Card

Wallet Card

If you are pregnant or planning to become pregnant, use this guide to see what amounts of fish caught and sold commercially are safe to eat.

Mercury Guides

Trim your intake of mercury with these useful guides.

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