<PAGE>


                                                                    EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as Chairman
of the Board and Chief Executive Officer of the Company, to sign such Form 10-K
and any and all amendments thereto, and to file such Form 10-K and each such
amendment so signed, with all exhibits thereto, and any and all other documents
in connection therewith, hereby granting unto said attorney-in-fact and agent
full power and authority to do and perform any and all acts and things requisite
and necessary to be done in and about the premises, as fully to all intents and
purposes as he might do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof.

             IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.



                                     /s/  J. PATRICK NICHOLSON
                                     ------------------------------------------
                                     J. Patrick Nicholson



                                       32
<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                      /s/  WALLACE G. IRMSCHER
                                      -----------------------------------------
                                      Wallace G. Irmscher



                                       33

<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                      /s/  B.K. WESLEY COPELAND
                                      -----------------------------------------
                                      B.K. Wesley Copeland




                                       34
<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  CHARLES B. KAISER, JR.
                                       ----------------------------------------
                                       Charles B. Kaiser, Jr.




                                       35
<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, Chief Operating Officer and President of the Company, to sign such
Form 10-K and any and all amendments thereto, and to file such Form 10-K and
each such amendment so signed, with all exhibits thereto, and any and all other
documents in connection therewith, hereby granting unto said attorney-in-fact
and agent full power and authority to do and perform any and all acts and things
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he might do in person, hereby ratifying and confirming
all that said attorney-in-fact and agent may lawfully do or cause to be done by
virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  TERRY J. LOGAN, PH.D.
                                       ----------------------------------------
                                       Terry J. Logan, Ph.D.




                                       36

<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Executive Vice-President and Director, to sign such Form 10-K and any and all
amendments thereto, and to file such Form 10-K and each such amendment so
signed, with all exhibits thereto, and any and all other documents in connection
therewith, hereby granting unto said attorney-in-fact and agent full power and
authority to do and perform any and all acts and things requisite and necessary
to be done in and about the premises, as fully to all intents and purposes as he
might do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent may lawfully do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  MICHAEL G. NICHOLSON
                                       ----------------------------------------
                                       Michael G. Nicholson




                                       37

<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  BOBBY B. CARROLL
                                       ----------------------------------------
                                       Bobby B. Carroll



                                       38

<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.


               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  DANIEL J. HASLINGER
                                       ----------------------------------------
                                       Daniel J. Haslinger



                                       39

<PAGE>

                                  EXHIBIT 24.1

                                POWER OF ATTORNEY


               KNOW ALL MEN BY THESE PRESENTS that the undersigned, a Director
of N-Viro International Corporation (the "Company"), a Delaware corporation that
is filing an Annual Report on Form 10-K ("Form 10-K") for the year ended
December 31, 2001 with the Securities and Exchange Commission under the
provisions of the Securities and Exchange Act of 1934, as amended, hereby
constitutes and appoints James K. McHugh his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, in the capacity as
Director, to sign such Form 10-K and any and all amendments thereto, and to file
such Form 10-K and each such amendment so signed, with all exhibits thereto, and
any and all other documents in connection therewith, hereby granting unto said
attorney-in-fact and agent full power and authority to do and perform any and
all acts and things requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might do in person, hereby
ratifying and confirming all that said attorney-in-fact and agent may lawfully
do or cause to be done by virtue hereof.

               IN WITNESS WHEREOF, the undersigned hereunto sets his hand this
11th day of April, 2002.


                                       /s/  R. FRANCIS DIPRETE
                                       ----------------------------------------
                                       R. Francis DiPrete








                                       40