Exhibit 99.11 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: March 23, 2004

                                  Exhibit 99.11

                             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:  March 23, 2004


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                                                Xxx Xxxxxxxx


                                            /s/ Xxxx X. Xxxxxxxx
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                                                Xxxx X. Xxxxxxxx