WPZ 2012 K-1s were available online on March 15 and mailed on March 20, 2013.
Williams Partners L.P.
Tax Package Support
PO Box 799060
Dallas, TX 75379
866-867-4074
For more information click here. Download Generic information sent in April 2013 to 2011 WPZ unitholders regarding agreement reached with the IRS
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