Do fire sprinklers reduce fire injury medical costs? On average, fire sprinklers reduce civilian fire injury medical costs by 53%. (2012) By ProMatcher Staff Updated: 08/08/2016 Next Question Source: National Fire Protection Assoc. Next Question Find Local Pros Free Actuaries Cost Estimates Related Questions Where do most fire deaths occur: residential or commercial properties? Do fire sprinklers keep fire fighters safer? Do fire sprinklers reduce civilian fire injury costs? Do fire sprinklers reduce fire damage? Do fire sprinklers use more water than traditional fire hoses?