Ironically, it can be an issue. I was in NOLA after Katrina and Rita. When there was a fire it was one New Orleans Engine and then a bunch from out of state (Chicago, New York, etc.) then a bunch of 3000 gallon water trucks. The water infrastructure was damaged so bad very few hydrants were working (this was after the flood waters receded). Not sure how bad the infrastructure is in Houston. If there is still high flood waters they can do what they did in Fargo many years ago put fire trucks on flatbed trucks and draft out of flood waters.

We setup in Belles Chase area and the guy in charge of fire response, basically south of New Orleans was a Battalion Chief from Minneapolis Fire. He had like 2 engines and a handful firefighters to fight everything including refinery fires and water was his biggest issue.