Question: why are fire hydrants blue in texas?
Answer: A blue bonnet means at least 1,500 GPM are available, possibly more. (Some hydrants are designed for 4,000 GPM.) A green bonnet means the flow is between 1,000 and 1,500 GPM. Most of Denton's 5,344 fire hydrants are inspected regularly and are designed to meet high standards, said city spokesman Ryan Adams.