It really depends on the scope and urgency of the plumbing issue. If you're dealing with a burst pipe - an emergent, potentially costly situation, call your homeowner's insurance emergency number and find out how to have one of their authorized plumbing contractors repair the damage ASAP. Attempting a DIY plumbing repair in this instance might void your insurance coverage.
For most other plumbing issues, there's usually no need to involve your insurance company.