Thank you for your question; new professional here:
the county may not have been at 100% fault; for example, the homeowner's insurance may have determined that the failure to put in a backwater valve, which often protects the home in case of a backup, contributed to the damage;
or they may have determined that the main line (which is the government's responsibility) and the the sewer pipeline that runs between the city sanitary sewer main usually under the street and one's house were both deteriorated and since the homeowner is responsible for the portion after the main line, that could cause a contributory negligence issue.
For the $2500 not covered one can file a suit here:
it would help to determine which part of the system failed, in order to prove that the county was fully liable.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.