I called another, large company. First question: Have you made a claim in the last five years. I wouldn't lie as I'm sure they have a database to check. No sooner had I said yes then he said: Well, then we won't insure you, and he literally hung up on me.
That was the last time I ever picked up the phone to make a claim. The damage would have to be catastrophic before I would.
That's why I do not carry a rider or separate insurance on anything. If you make a claim, you'll pay them back in spades.
The primary problem there is that you made a claim for water damage. Water damage is a special fear for all insurance companies, because water damage leads to later mold damage--and that can lead to the total loss of the house and lifetime medical payments.
Not only that, but there is, indeed, an industry database on water damage claims. Claiming water damage will not only cause you high rates (if you can get coverage) but will also affect any future owners of that home.
Bottom line: Don't claim water damage unless it wipes out the house. Don't even inquire about claiming water damage--even an inquiry goes into the database.