JOINT FILING AGREEMENT

                                  Exhibit 99.4

                             JOINT FILING AGREEMENT

     The undersigned  agree that this Schedule 13D filing  herewith  relating to
securities  of  WorldWater  Corp.  is filed  jointly  on  behalf  of each of the
undersigned pursuant to Rule 13d-1(k).

Dated:  November 21, 2002
                                          /s/ Xxx Xxxxxxxx
                                              Xxx Xxxxxxxx

                                          /s/ Xxxx X. Xxxxxxxx
                                              Xxxx X. Xxxxxxxx