Place the settings.xml in your user directory ~/.m2/settings.xml
This is more flexible than managing repositories via the pom.xml, and is the recommended best-practice.
<settings>
<profiles>
<profile>
<id>in-house-repos</id>
<repositories>
<!-- Add as many repositories as necessary -->
<repository>
<id>in-house-snap-1</id>
<name>In-House Repository for Snapshots 1</name>
<!-- look at 'servers' or 'proxies' if you can't connect to the url -->
<url>http://ourrepo/maven/</url>
<snapshotPolicy>always</snapshotPolicy>
</repository>
</repositories>
</profile>
</profiles>
<!-- must activate the profile -->
<activeProfiles>
<activeProfile>in-house-repos</activeProfile>
</activeProfiles>
</settings>