- Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Expires: February 28, 2011 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Walden Rick L.

2. Date of Event Requiring Statement (MM/DD/YYYY) 9/29/2009

3. Issuer Name and Ticker or Trading Symbol

ARCH CHEMICALS INC [ARJ]

(Last) (First) (Middle)

C/O ARCH CHEMICALS, INC., 501 MERRITT 7

4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director _____ 10% Owner
___ X ___ Officer (give title below) _____ Other (specify below)
Sr VP, Biocides, Perf. Product /

(Street)

NORWALK, CT 06851

(City) (State) (Zip)

5. 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 Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock $1 Par Value ⁽¹⁾	3339.9922	I	By CEOP Trustee

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Phantom Stock Units ⁽²⁾	⁽²⁾	⁽²⁾	Common Stock	1850	⁽³⁾	D
Phantom Stock Units ⁽²⁾	12/31/2013 ⁽⁴⁾	12/31/2013 ⁽⁴⁾	Common Stock	1850	⁽³⁾	D
Phantom Stock Units	12/31/2014 ⁽⁴⁾	12/31/2014 ⁽⁴⁾	Common Stock	3100	⁽³⁾	D

Explanation of Responses:
( 1)	The figure shown represents shares of Arch Common Stock acquired on a periodic basis under the Contributing Employee Ownership Plan (CEOP), a tax conditioned plan, and held as of 09/29/2009 in the Arch Common Stock Fund of the CEOP, in transactions exempt under Rule 16b-3, and is based on information provided by the Plan Administrator .
( 2)	Phantom share units which are paid out in cash at maturity if the officer is still employed by the company . These phantom share units were granted on February 5, 2004 and vest on December 31, 2009.
( 3)	This security converts to common stock on a 1 for 1 basis
( 4)	Phantom share units granted under the Arch Chemicals, Inc 1999 Long Term Incentive Plan which may be paid out in cash or stock at an earlier date provided certain financial measures are reached by the company. Otherwise, they are paid out in cash or stock at maturity if the officer is still employed by the company, subject to plan provisions.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Walden Rick L. C/O ARCH CHEMICALS, INC. 501 MERRITT 7 NORWALK, CT 06851			Sr VP, Biocides, Perf. Product

Signatures
Joseph P. Lacerenza, Attorney in Fact		9/30/2009
^** Signature of Reporting Person		Date

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 5(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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

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