As 2003 NRL premiers, the Penrith club travelled to England to face Super League VIII champions, the Bradford Bulls in the 2004 World Club Challenge. Waterhouse played at lock forward in Penrith's 22–4 loss. In February 2007, Waterhouse signed with the Panthers until the end of 2011. In the same year, Penrith finished last on the table and claimed the wooden spoon.[3][4]
He was selected for City in the City vs Country match in 2006 and again in 2009.[5]
Waterhouse made his state representative début in the 2004 State of Origin series, playing in games I and II off the bench for the New South Wales Blues.[6] Selected again in 2009,[7] Waterhouse was sent-off after coming into a fight between Steve Price and Brett White during game III of the State of Origin series. He became the first Blues player to be dismissed from an Origin game,[8] and the first since Gorden Tallis to be sent off in an Origin match. His dismissal capped off a horror year for NSW as they lost their fourth (of eight) straight Origin series.
On 29 June 2011 it was announced Waterhouse had signed to join English Super League club Warrington from 2012 on a three-year deal.
^"Waterhouse watertight with Panthers". Fox Sports News (Australia). 7 February 2008. Archived from the original on 22 May 2011. Retrieved 7 February 2008.{{cite news}}: CS1 maint: bot: original URL status unknown (link)
^Payten, Iain (5 July 2009). "NSW name team for State of Origin III". The Daily Telegraph (Sydney). Archived from the original on 11 August 2011. Retrieved 15 July 2009.{{cite news}}: CS1 maint: bot: original URL status unknown (link)
^Jancetic, Steve (15 July 2009). "Blues deny Maroons sweep". Fox Sports News (Australia). Archived from the original on 7 October 2009. Retrieved 15 July 2009.{{cite news}}: CS1 maint: bot: original URL status unknown (link)