Periodic table entry for uranium that includes the atomic number, abbreviation and mass
CAS Number: various

Natural uranium is a weakly radioactive metal that occurs in many types of rock.  Natural uranium can be found at low levels in some drinking water sources and foods.  Enriched uranium is derived from natural uranium and is much more radioactive.  Enriched uranium is used as fuel in nuclear power plants and in nuclear weapons.  Depleted uranium, a byproduct of uranium processing, is used in military and medical applications.  Depleted uranium can have toxic effects similar to natural uranium, but is less radioactive.

Fact Sheet

Uranium is found in:

  • Drinking water sources in some places, such as parts of the Central Valley and some areas of Southern California.
  • Some foods, such as root vegetables and leafy greens, grown in areas containing uranium in soil or water.
  • Radiation-shielding equipment containing depleted uranium, used in medical and other applications.
  • Specialized ammunition and other military equipment made with depleted uranium.

Possible health concerns of uranium


  • Can cause kidney damage.
  • Can increase cancer risk.

Possible ways to reduce exposure to uranium

  • If your water comes from a private well, have it tested for metals, including uranium.  (If your water comes from a public water supplier, it is already tested regularly for uranium.)
  • If you work with uranium, follow all occupational safety guidelines for your industry.

Biomonitoring California Information

Documents, Presentations, and Publications: 

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