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Pueblo County Sheriff's Office

Emergency Services Bureau - CSEPP

Mustard Facts

Background:  Pueblo Chemical Depot has been storing mustard agent since the 1950's.  This represents about 8.5 percent of the original U.S. chemical weapons stockpile.  Pueblo's stockpile includes projectiles and mortar rounds.


  • Clear liquid when pure.
  • Consistency of motor oil or molasses.
  • Normally a yellow-brown color.
  • Heavier than water as a liquid & heavier than air as a vapor.
  • Mustard is a persistent agent.
  • Mustard is a vesicant; can cause blisters.
  • Designed to incapacitate personnel.


  • Stored in earth-covered bunkers called igloos.
  • Igloos, constructed of concrete with reinforced steel, are 25 feet high, 25 feet wide, and 80 feet long.
  • The igloos are specifically designed to contain the weapons and protect them from damage caused by deterioration and weather-related events.
  • The chemical storage area is secured and monitored 24 hours a day, 7 days a week.

HD HT - Pueblo's stockpile consists of two types of mustard - HD & HT

  • HD is a sulfur mustard, distilled to remove impurities.
  • HD becomes a solid at 58º F, and boils at 422° F.
  • HD is 1.27 times heavier than water, and 5.5 times heavier than air.
  • HT is a distilled mustard combined with a sulfur and chlorine compound.
  • HT becomes a solid at 34° F, and boils at 442° F.
  • HT is 1.27 times heavier than water, and 6.9 times heavier than air.


  • Burning or stinging of the eyes.
  • Sore throat & hoarse cough.
  • Burning, stinging, or redness of the skin.
  • Skin blisters, appear on delicate tissues first.
  • Ingestion can cause weakness, nausea, vomiting, and fever.
  • 2 - 24 hour delay before symptoms appear.


  • Flush eyes and exposed wounds with clear water or saline only.
  • Remove contaminated clothing.
  • Flush skin with a 5% household bleach to water mixture followed by washing with soap and water.
  • If any of above symptoms appear, seek medical attention immediately.



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    909 Court Street
    Pueblo, CO  81003
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Pueblo County Sheriff's Office