35 Ill. Adm. Code 101.403
Joinder of Parties
Section 101
Section 101.403 Joinder of
Parties
a) The Board, on its own motion or the motion of any party, may
add a person as a party to any adjudicatory proceeding if:
1) A complete determination of a controversy cannot be had
without the presence of the person who is not already a party to the proceeding;
2) The person who is not already a party to the proceeding has an
interest that the Board's order may affect; or
3) It may be necessary for the Board to impose a condition on the
person who is not already a party to the proceeding.
b) The Board will not dismiss an adjudicatory proceeding for
misjoinder of parties. The Board will not dismiss an adjudicatory proceeding
for nonjoinder of persons who must be added to allow the Board to decide an
action on the merits without first providing a reasonable opportunity to add
the persons as parties. As justice may require, the Board may add new parties
and dismiss misjoined parties at any stage of an adjudicatory proceeding.