2009 Iowa Code
Title 3 - Public Services and Regulation
Subtitle 2 - Employment Services
CHAPTER 89B - HAZARDOUS CHEMICALS RISKS == RIGHT TO KNOW
89B.14 - SIGNS IDENTIFYING HAZARDOUS CHEMICALS.

        89B.14  SIGNS IDENTIFYING HAZARDOUS CHEMICALS.
         If a building or structure has a floor space of five thousand
      square feet or less, an employer shall post signs on the outside of
      the building or structure identifying the type of each hazardous
      chemical contained in the building or structure.  If the building has
      more than five thousand square feet, the employer shall post a sign
      at the place within the building where each hazardous chemical is
      permanently stored to identify the type of hazardous chemical.  If
      the hazardous chemical or a portion of the hazardous chemical is
      moved within the building, the employer shall also move the sign or
      post an additional sign at the location where the hazardous chemical
      is moved.  All letters and figures on signs required by this section
      shall be at least three inches in height.  However, upon the written
      application of an employer, the division may permit less stringent
      sign posting requirements.  The signs shall comply with the national
      fire protection association's standard system for the identification
      of fire hazards of materials, based upon NFPA 704-1980.  The division
      shall adopt rules exempting employers from the requirements of this
      section when a building or structure or a portion of a building or
      structure does not contain significant amounts of a hazardous
      chemical.  

         84 Acts, ch 1085, § 14
         C85, § 455D.14
         C87, § 89B.14