Map rankings lean on three things: how relevant your listing is to the job searched, how close you are to the searcher, and how prominent your business appears across the web. Distance you cannot change, so the work goes into relevance and prominence. That means the right primary category, services listed in plain words, photos from real jobs, and answers to common questions posted where customers can see them.
Reviews carry weight twice. They feed the ranking, and they decide the click. A homeowner comparing three plumbers reads what customers said about showing up on time, cleaning up afterward and explaining the repair. A simple routine where technicians ask happy customers for a review, mentioning the job that was done, gives your listing the words Google matches to searches such as water heater replacement or slab leak repair.
Many plumbers run as service-area businesses and hide their street address. That is fine, but the website then has to carry the geography: pages for the towns and neighborhoods you serve, each with something true to say about the housing stock, older pipe materials, hard water or septic systems common there.