Here are some letters from George Washington sent to a man named Geoege Washington Snyder concerning the Illuminati. GW was concerned with this issue because he himself was a mason, and well aware that the Illuminati infiltrated multiple masonic lodges in Europe, where they would recruit members.
WASHINGTON DENIES AMERICAN MASONIC SOCIETIES PROMOTE ILLUMINATI AGENDA
Among the correspondence of George Washington, are letters from a gentleman by the name of George Washington Snyder, who sent to the President a copy of John Robison's Proofs of a Conspiracy Against All the Religions and Governments of Europe (New York: George Forman, 1798; reprint edition, Boston: Western Islands, 1967). This volume revealed the Illuminist plan, through the agency of Freemasonry, for the overthrow of established governments and religions. Mr. Snyder apparently questioned the propriety of the President's membership and position as Grand Master of the Alexandria Lodge No. 22 of Virginia. In two letters responding to Mr. Snyder, President Washington denied that American Masonic societies are contaminated with the subversive ideology of the Illuminati.
Letter of George Washington to George Washington Snyder, September 25, 1798
The Writings of George Washington from the Original Manuscript Sources, 1745-1799. John C. Fitzpatrick, Editor.--vol. 36
[Note 7: Of Fredericktown (now Frederick), Md.]
Mount Vernon, September 25, 1798.
Sir: Many apologies are due to you, for my not acknowledging the receipt of your obliging favour of the 22d. Ulto, and for not thanking you, at an earlier period, for the Book 8 you had the goodness to send me.
[Note 8: Proofs of a Conspiracy, by John Robison.]
I have heard much of the nefarious, and dangerous plan, and doctrines of the Illuminati, but never saw the Book until you were pleased to send it to me.9 The same causes which have prevented my acknowledging the receipt of your letter have prevented my reading the Book, hitherto; namely, the multiplicity of matters which pressed upon me before, and the debilitated state in which I was left after, a severe fever had been removed. And which allows me to add little more now, than thanks for your kind wishes and favourable sentiments, except to correct an error you have run into, of my Presiding over the English lodges in this Country. The fact is, I preside over none, nor have I been in one more than once or twice, within the last thirty years. I believe notwithstanding, that none of the Lodges in this Country are contaminated with the principles ascribed to the Society of the Illuminati. With respect I am &c.
[Note 9: In a letter from Snyder (Aug. 22, 1798, which is in the Washington Papers), it is stated that this book "gives a full Account of a Society of Free-Masons, that distinguishes itself by the Name of 'Illuminati,' whose Plan is to overturn all Government and all Religion, even natural."]
These letters are authentic, which you can check yourself at the following link.
George Washington Papers at the Library of Congress
TL;DR
George Washington stated that masonic lodges in America were not corrupted by the Illuminati.