If the deadline passed to file claims on the class action, you are probably out of luck on that front. You should contact the claims administrator or law firm listed on the class notice. Most home owners policies include coverage for water damage so long as it's plumbing related and not ground water or flooding. I would definitely contact your insurance agent to get the full scope of your coverage and/or to submit a claim.
My colleague and friend Jeff is correct. If the deadline to file a proof of claim has passed, in most cases you not only lose the right to make a claim in the settlement, but also you cannot sue individually or continue a previously filed lawsuit making the same claims as the class action. However, notices for class action settlements can sometimes be confusing, so you really should contact the claims administrator and the law firm representing the class to find out if, in fact, the time to make a claim (or opt-out) has passed. In rare cases, the time to file claims is extended by the court due to problems with the notice of the settlement, so there's a chance that there may still be time.