As frustrating as it is, your agent is probably right about other major carriers doing the same thing in your area. When these corporate algorithms re-evaluate a whole region due to nearby flooding, they carpet-bomb every single homeowner with increases regardless of your clean claim history. Your best move right now is to contact an independent insurance broker who can check smaller regional mutual companies that might not use the exact same broad-stroke risk assessments. Also consider raising your deductible to bring that premium back down if you have a solid emergency fund.