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<P ALIGN="CENTER"><FONT SIZE=5><B>SECURITIES AND EXCHANGE COMMISSION<BR>  </B></FONT><FONT SIZE=2><B>Washington, D.C. 20549  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=5><B>FORM 8-K<BR>  </B></FONT><FONT SIZE=2><B>CURRENT REPORT  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B> Pursuant to Section&nbsp;13 or 15(d) of the<BR>
Securities Exchange Act of 1934  </B></FONT></P>

<P ALIGN="CENTER"><font size="2">April 27, 2006<BR>Date of Report (date of earliest event reported)
</font></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=5><B>WAMU ASSET ACCEPTANCE CORP.</B></FONT><P ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=3>as Depositor under a   <BR>Pooling and Servicing Agreement <BR>
dated as of April 1, 2006 <BR>providing for the issuance of  <BR>&nbsp;</FONT></P>



<P ALIGN=CENTER><b>WASHINGTON MUTUAL M</b><FONT SIZE=3><B>ORTGAGE PASS-THROUGH CERTIFICATES,<br>
WMALT SERIES 2006-4</B></FONT><FONT SIZE=2><BR>(Exact name of Registrant as specified in its charter) </FONT></P>



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<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><B>Delaware</B></FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><B>
333-130795</B></FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><font size="2"><b>20-2258610</b></font></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>(State or other jurisdiction<BR>
of incorporation)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>(Commission File Number)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>(I.R.S. Employer<BR>
Identification No.)</FONT></TD>
</TR>
</TABLE>
<P ALIGN="CENTER"><FONT SIZE=2><B>1201 THIRD AVENUE, WMT 1706A<BR>
SEATTLE, WASHINGTON 98101<BR>  </B></FONT><FONT SIZE=2>(Address of principal executive offices and Zip Code) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>Registrant's telephone number, including area
code: (206)&nbsp;554-8838 </FONT></P>

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<td width="100%" align="center" style="border-style: none; border-width: medium"><font size="2">(Former name or former address, if
changed since last report)</font></td>
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</table>

<p style="font-size: 10pt" align="left">&nbsp;Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:</p>

<p style="font-size: 10pt" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font face="Wingdings">o</font>&nbsp;Written communications
pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</p>

<p style="font-size: 10pt" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font face="Wingdings">o</font>&nbsp;Soliciting material
pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</p>

<p style="font-size: 10pt" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font face="Wingdings">o</font>&nbsp;Pre-commencement
communications pursuant to Rule&nbsp;14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</p>

<p style="font-size: 10pt" align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font face="Wingdings">o</font>&nbsp;Pre-commencement
communications pursuant to Rule&nbsp;13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</p>

<P ALIGN="left">&nbsp;</P>

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<P><font size="2" face="Times New Roman"><b>SECTION 9 </b>
&nbsp;<b>FINANCIAL STATEMENTS AND EXHIBITS</b></font></P>



<P><font size="2" face="Times New Roman"><b>Item 9.01.</b>&nbsp;&nbsp;Financial Statements and Exhibits.
</font></P>



<P><font size="2" face="Times New Roman">(c)&nbsp; Exhibits</font></P>



<P><font size="2" face="Times New Roman">The following exhibits are filed herewith:</font></P>

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<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.1
</font></TD>
<TD ALIGN=LEFT WIDTH=95%><FONT FACE="Times New Roman" SIZE=2>
Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer,
LaSalle Bank National Association, as Trustee, and Christiana Bank &amp; Trust
Company, as Delaware Trustee, dated as of April 1, 2006.  </FONT></TD>
</TR>
</TABLE>
<p>&nbsp;</p>

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<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.2</font></TD>
<TD ALIGN=LEFT WIDTH=95%><font face="Times New Roman" size="2">
Mortgage Loan Purchase Agreement, dated as of December 28, 2005, among WaMu
Asset Acceptance Corp. and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.7 to the Registration Statement
No. 333-130795, filed on Form S-3 by WaMu Asset Acceptance Corp. on December 12,
2005).</font></TD>
</TR>
</TABLE>


<p>&nbsp;</p>

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<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.3</font></TD>
<TD ALIGN=LEFT WIDTH=95%><font face="Times New Roman" size="2">Amended and
Restated Administrative
Agent Agreement, dated as of February 1, 2005, between Washington Mutual Bank
and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.9 to
the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on March 6,
2006 with respect to Registration Statement No. 333-130795).</font></TD>
</TR>
</TABLE>
<p>&nbsp;</p>




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<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">99.1</font></TD>
<TD ALIGN=LEFT WIDTH=95%>
<font face="Times New Roman" size="2">Excerpt from Section 2 of the Term Sheet, dated
as of April 27, 2006, between Washington Mutual
Mortgage Securities Corp., as seller,
and WaMu Asset Acceptance Corp., as purchaser.&nbsp; For a form of term sheet,
see Exhibit B to Exhibit 4.7 to the Registration Statement No. 333-130795, filed
on Form S-3 by WaMu Asset Acceptance Corp. on December 12, 2005.&nbsp; </font></TD>
</TR>
</TABLE>
<p>&nbsp;</p>




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<TD ALIGN=RIGHT WIDTH=5%>&nbsp;</TD>
<TD ALIGN=LEFT WIDTH=95%><FONT FACE="Times New Roman" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
The Mortgage Loan Schedule, included as Exhibit D to the Pooling and Servicing
Agreement, has been intentionally
omitted from this filing.&nbsp; Copies may be obtained from WaMu Asset
Acceptance Corp. or LaSalle Bank National Association by contacting:</FONT></TD>
</TR>
</TABLE>
<p>&nbsp;</p>
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<TD ALIGN=RIGHT WIDTH=6%>&nbsp;</TD>
<TD ALIGN=LEFT WIDTH=94%><FONT FACE="Times New Roman" SIZE=2>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;in the case of WaMu Asset Acceptance Corp., </FONT></TD>
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<p>&nbsp;</p>
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<TD ALIGN=RIGHT WIDTH=5%>&nbsp;</TD>
<TD ALIGN=LEFT WIDTH=95%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
John Ganzer<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WaMu Asset Acceptance Corp.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c/o Washington Mutual Mortgage
Securities Corp.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;75 N. Fairway Drive,VHF2A01 <BR> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vernon
Hills, IL 60061
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Telephone: &nbsp;(847) 549-3113<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Facsimile:&nbsp;&nbsp;&nbsp;&nbsp;
(847) 549-3680 </FONT>
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&nbsp;</font></p>
</td>
<td width="94%" valign="top" style='width:94.0%;padding:0in 0in 0in 0in'>
<font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;in the case of LaSalle Bank National
Association,</font></td>
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</table>

<p><font size="2" face="Times New Roman">&nbsp;</font></p>

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<p align="right" style='text-align:right'><font size="2" face="Times New Roman">
&nbsp;</font></p>
</td>
<td width="95%" valign="top" style='width:95.0%;padding:0in 0in 0in 0in'>
<font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Stefanie Edwards<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LaSalle Bank National Association<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;135 S. LaSalle Street, Suite 1625<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Chicago, IL&nbsp; 60603<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Telephone:&nbsp;&nbsp;(312) 904-8975<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Facsimile:&nbsp;&nbsp;&nbsp;&nbsp;(312) 904-2084</font></td>
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<P>&nbsp;</P>



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<p align="center">&nbsp;</p>

<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned
hereunto duly authorized. </FONT></P>

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<TD WIDTH="47%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="51%" COLSPAN=3>
<p align="center">&nbsp;</TD>
</TR>
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<TD WIDTH="47%">&nbsp;</TD>
<TD WIDTH="2%">&nbsp;</TD>
<TD WIDTH="3%">&nbsp;</TD>
<TD WIDTH="1%">&nbsp;</TD>
<TD WIDTH="47%" ALIGN="CENTER"><b><FONT SIZE=2>WAMU ASSET ACCEPTANCE CORP.</FONT></b></TD>
</TR>
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<TD WIDTH="47%"><FONT SIZE=2><BR>
Date:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; May 12, 2006</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="47%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/ David H. Zielke</FONT><HR NOSHADE><font size="2">David H. Zielke<BR>
<i>First Vice President<br>
</i>(Authorized Officer)</font></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="47%"><font size="2">`</font></TD>
<TD WIDTH="2%">&nbsp;</TD>
<TD WIDTH="3%">&nbsp;</TD>
<TD WIDTH="1%">&nbsp;</TD>
<TD WIDTH="47%" ALIGN="CENTER">&nbsp;</TD>
</TR>
</TABLE>



<p>&nbsp;</p>
<p>&nbsp;</p>
<hr>
<p align="center"><u><b>Exhibit Index</b></u></p>



<P>&nbsp;</P>

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<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.1
</font></TD>
<TD ALIGN=LEFT WIDTH=95%><FONT FACE="Times New Roman" SIZE=2>
Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer,
LaSalle Bank National Association, as Trustee, and Christiana Bank &amp; Trust
Company, as Delaware Trustee, dated as of April 1, 2006.  </FONT></TD>
</TR>
</TABLE>
<p>&nbsp;</p>

<TABLE WIDTH=100% CELLPADDING=0 CELLSPACING=0>
<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.2</font></TD>
<TD ALIGN=LEFT WIDTH=95%><font face="Times New Roman" size="2">
Mortgage Loan Purchase Agreement, dated as of December 28, 2005, among WaMu
Asset Acceptance Corp. and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.7 to the Registration Statement
No. 333-130795, filed on Form S-3 by WaMu Asset Acceptance Corp. on December 12,
2005).</font></TD>
</TR>
</TABLE>


<p>&nbsp;</p>

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<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">4.3</font></TD>
<TD ALIGN=LEFT WIDTH=95%><font face="Times New Roman" size="2">Amended and
Restated Administrative
Agent Agreement, dated as of February 1, 2005, between Washington Mutual Bank
and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.9 to
the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on March 6,
2006 with respect to Registration Statement No. 333-130795).</font></TD>
</TR>
</TABLE>
<p>&nbsp;</p>




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<TR VALIGN=TOP>
<TD ALIGN=RIGHT WIDTH=5%>
<p align="left"><font face="Times New Roman" size="2">99.1</font></TD>
<TD ALIGN=LEFT WIDTH=95%>
<font face="Times New Roman" size="2">Excerpt from Section 2 of the Term Sheet, dated
as of April 27, 2006, between Washington Mutual
Mortgage Securities Corp., as seller,
and WaMu Asset Acceptance Corp., as purchaser.&nbsp; For a form of term sheet,
see Exhibit B to Exhibit 4.7 to the Registration Statement No. 333-130795, filed
on Form S-3 by WaMu Asset Acceptance Corp. on December 12, 2005.&nbsp; </font></TD>
</TR>
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{"company-data": {"conformed-name": "Washington Mutual Mortgage Pass-Through Certificates, WMALT Series 2006-4", "cik": "0001358936", "assigned-sic": "6189", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "333-130795-12", "film-number": "06833601"}, "business-address": {"street1": "1201 THIRD AVENUE, 17TH FLOOR", "city": "SEATTLE", "state": "WA", "zip": "98101", "phone": "206-461-2000"}, "mail-address": {"street1": "1201 THIRD AVENUE, 17TH FLOOR", "city": "SEATTLE", "state": "WA", "zip": "98101"}}
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
April 27, 2006
Date of Report (date of earliest event reported)
WAMU ASSET ACCEPTANCE CORP.
as Depositor under a
Pooling and Servicing Agreement
dated as of April 1, 2006
providing for the issuance of
WASHINGTON MUTUAL M
ORTGAGE PASS-THROUGH CERTIFICATES,
WMALT SERIES 2006-4
(Exact name of Registrant as specified in its charter)
Delaware
333-130795
20-2258610
(State or other jurisdiction
of incorporation)
(Commission File Number)
(I.R.S. Employer
Identification No.)
1201 THIRD AVENUE, WMT 1706A
SEATTLE, WASHINGTON 98101
(Address of principal executive offices and Zip Code)
Registrant's telephone number, including area
code: (206) 554-8838
(Former name or former address, if
changed since last report)
Check the appropriate box below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:
o
Written communications
pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material
pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
SECTION 9
FINANCIAL STATEMENTS AND EXHIBITS
Item 9.01.
Financial Statements and Exhibits.
(c)  Exhibits
The following exhibits are filed herewith:
4.1
Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer,
LaSalle Bank National Association, as Trustee, and Christiana Bank & Trust
Company, as Delaware Trustee, dated as of April 1, 2006.
4.2
Mortgage Loan Purchase Agreement, dated as of December 28, 2005, among WaMu
Asset Acceptance Corp. and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.7 to the Registration Statement
No. 333-130795, filed on Form S-3 by WaMu Asset Acceptance Corp. on December 12,
2005).
4.3
Amended and
Restated Administrative
Agent Agreement, dated as of February 1, 2005, between Washington Mutual Bank
and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.9 to
the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on March 6,
2006 with respect to Registration Statement No. 333-130795).
99.1
Excerpt from Section 2 of the Term Sheet, dated
as of April 27, 2006, between Washington Mutual
Mortgage Securities Corp., as seller,
and WaMu Asset Acceptance Corp., as purchaser.  For a form of term sheet,
see Exhibit B to Exhibit 4.7 to the Registration Statement No. 333-130795, filed
on Form S-3 by WaMu Asset Acceptance Corp. on December 12, 2005.
The Mortgage Loan Schedule, included as Exhibit D to the Pooling and Servicing
Agreement, has been intentionally
omitted from this filing.  Copies may be obtained from WaMu Asset
Acceptance Corp. or LaSalle Bank National Association by contacting:
in the case of WaMu Asset Acceptance Corp.,
John Ganzer
WaMu Asset Acceptance Corp.
c/o Washington Mutual Mortgage
Securities Corp.
75 N. Fairway Drive,VHF2A01
Vernon
Hills, IL 60061
Telephone:  (847) 549-3113
Facsimile:    
(847) 549-3680
in the case of LaSalle Bank National
Association,
Stefanie Edwards
LaSalle Bank National Association
135 S. LaSalle Street, Suite 1625
Chicago, IL  60603
Telephone:  (312) 904-8975
Facsimile:    (312) 904-2084
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned
hereunto duly authorized.
WAMU ASSET ACCEPTANCE CORP.
Date:       May 12, 2006
By:
/s/ David H. Zielke
David H. Zielke
First Vice President
(Authorized Officer)
`
Exhibit Index
4.1
Pooling and Servicing Agreement by and among WaMu Asset Acceptance Corp., as Depositor, Washington Mutual Bank, as Servicer,
LaSalle Bank National Association, as Trustee, and Christiana Bank & Trust
Company, as Delaware Trustee, dated as of April 1, 2006.
4.2
Mortgage Loan Purchase Agreement, dated as of December 28, 2005, among WaMu
Asset Acceptance Corp. and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.7 to the Registration Statement
No. 333-130795, filed on Form S-3 by WaMu Asset Acceptance Corp. on December 12,
2005).
4.3
Amended and
Restated Administrative
Agent Agreement, dated as of February 1, 2005, between Washington Mutual Bank
and Washington Mutual Mortgage Securities Corp.
(incorporated herein by reference from Exhibit 4.9 to
the Current Report on Form 8-K filed by WaMu Asset Acceptance Corp. on March 6,
2006 with respect to Registration Statement No. 333-130795).
99.1
Excerpt from Section 2 of the Term Sheet, dated
as of April 27, 2006, between Washington Mutual
Mortgage Securities Corp., as seller,
and WaMu Asset Acceptance Corp., as purchaser.  For a form of term sheet,
see Exhibit B to Exhibit 4.7 to the Registration Statement No. 333-130795, filed
on Form S-3 by WaMu Asset Acceptance Corp. on December 12, 2005.