FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

MAO ROBERT YU LANG		 2. Issuer Name and Ticker or Trading Symbol

Energy Recovery, Inc. [ ERII ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

C/O ENERGY RECOVERY, INC., 1717 DOOLITTLE DRIVE		 3. Date of Earliest Transaction (MM/DD/YYYY)

8/9/2022
(Street)

SAN LEANDRO, CA 94577
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 8/9/2022  M  2000 A$5.43 2000 D  
Common Stock 8/9/2022  S  2000 D$22.4633 0 D  
Common Stock 8/10/2022  M  15236 A$5.43 15236 D  
Common Stock         64042 I Limited Purpose Trust 
Common Stock         32166 I The Robert and Iran Mao Rev Trust DTD 04-06-2006 

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)		8. Price of Derivative Security
(Instr. 5)		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy) $5.43 8/9/2022  M     2000   (1)9/3/2023 Common Stock 2000.0 $5.43 15236 D  
Stock Option (Right to Buy) $5.43 8/10/2022  M     15236   (1)9/3/2023 Common Stock 15236.0 $5.43 0 D  
Explanation of Responses:
(1) This stock option was granted on 9/3/2013. All the options are fully vested and exercisable on the date of the 2014 Shareholder Meeting.

Remarks:
Exhibit 24

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
MAO ROBERT YU LANG
C/O ENERGY RECOVERY, INC.
1717 DOOLITTLE DRIVE
SAN LEANDRO, CA 94577		X
President and CEO
Signatures
/s/ William Yeung, Attorney-in-Fact for Robert Yu Lang Mao8/11/2022
**Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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