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☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number : 001-32892 MUELLER WATER PRODUCTS , INC . ( Exact Name of Registrant as Specified in Its Charter ) Delaware ( State or Other Jurisdiction of Incorporation or Organization ) Title of Each Class Common Stock , par value $ 0.01 1200 Abernathy Road N.E. Suite 1200 20-3547095 ( I.R.S. Employer Identification Number ) Atlanta , GA 30328 ( Address of Principal Executive Offices ) Registrant's telephone number : ( 770 ) 206-4200 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol MWA Name of Each Exchange on Which Registered New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes > No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulations S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files . ) Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : Large accelerated filer Accelerated filer Non - accelerated filer ☐ Smaller reporting company ☐ Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant had filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No There were 157,999,037 shares of common stock of the registrant outstanding at November 10 , 2021. At March 31 , 2021 , the aggregate market value of the voting and non - voting common stock held by non - affiliates ( assuming only for purposes of this computation that directors and executive officers may be affiliates ) was $ 2,176.3 million based on the closing price per share as reported on the New York Stock Exchange . DOCUMENTS INCORPORATED BY REFERENCE Applicable portions of the Proxy Statement for the upcoming 2022 Annual Meeting of Stockholders of the Company are incorporated by reference into Part III of this Form 10 - K .