Section 906 Certifications

I, Charles E. Porter, the Principal Executive Officer of the Funds listed on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended March 31, 2009 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.

Date: May 28, 2009

/s/ Charles E. Porter
______________________
Charles E. Porter
Principal Executive Officer

Section 906 Certifications

I, Steven D. Krichmar, the Principal Financial Officer of the Funds listed on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period ended March 31, 2009 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended March 31, 2009 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.

Date: May 28, 2009

/s/ Steven D. Krichmar
______________________
Steven D. Krichmar
Principal Financial Officer

Attachment A 

N-CSR 

Period (s) ended March 31, 2009 

Putnam Master Intermediate Income Trust 

Putnam California Tax Exempt Income Fund 

Putnam American Government Income Fund 

Putnam Tax Exempt Income Fund 

Putnam International New Opportunities Fund 

Putnam U.S. Government Income Trust 

Putnam Money Market Fund 

Putnam Tax Exempt Money Market Fund 

Putnam Diversified Income Trust 

Putnam Asset Allocation: Balanced Portfolio 

Putnam Asset Allocation: Growth Portfolio 

Putnam Asset Allocation: Conservative Portfolio