Can our water infrastructure support this?

In most cases it already does, and sprinklers make it easier to manage. A residential system draws household-scale flow for a few minutes. A fire department response draws thousands of gallons in surges. The Town of Erie's engineering director has said that sprinklers make water system management easier for exactly that reason: fires stop creating massive, unplanned spikes in demand, and water use becomes measured and predictable instead of overwhelming the distribution system. Most NFPA 13D systems perform on the existing domestic service, though some require a larger service line or meter. Where street pressure is low, a booster pump can supplement it. These are not specialty fire pumps. Where the domestic supply itself cannot meet the demand, a storage tank with a pump does the job, at roughly $5.00 per sprinklered square foot against $3.50 and up where pressure is available.