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, 2007 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, 2007 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
Date: May 25, 2007
/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, 2007 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, 2007 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
Date: May 25, 2007
/s/ Steven D. Krichmar
______________________
Steven D. Krichmar
Principal Financial Officer
Attachment A
N-CSR
Period (s) ended March 31, 2007
| 054 | Putnam High Yield Municipal Trust |
| 074 | Putnam Master Intermediate Income Trust |
| 027 | Putnam California Tax Exempt Income Fund |
| 033 | Putnam American Government Income Fund |
| 011 | Putnam Tax Exempt Income Fund |
| 539 | Putnam International New Opportunities Fund |
| 032 | Putnam U.S. Government Income Trust |
| 010 | Putnam Money Market Fund |
| 062 | Putnam Tax Exempt Money Market Fund |
| 23T | Putnam Prime Money Market Fund |
| 075 | Putnam Diversified Income Trust |
| 259 | Putnam Asset Allocation: Balanced Portfolio |
| 250 | Putnam Asset Allocation: Growth Portfolio |
| 264 | Putnam Asset Allocation: Conservative Portfolio |