Respond to a bad review calmly and quickly, thank the customer, acknowledge the problem without arguing details in public, and invite them to contact you to make it right. Keep it short and professional. Future customers judge you more by the reply than by the complaint.
Every plumber gets a tough review eventually, often about price, scheduling or a repair that did not hold. The instinct is to defend yourself and explain why the customer is wrong. Resist it. Prospective customers read your reply to see how you treat people when things go sideways. A defensive or sarcastic reply hurts you more than the review itself. Most homeowners understand that problems happen. What they watch for is how you handle them. A calm reply can win you more trust than a perfect rating.
A good response thanks the person for the feedback, acknowledges their frustration, and invites them to call or text so you can look into it. Avoid sharing private details about the job or the customer. If the review contains false claims, you can state calmly that your records show something different and that you would like to resolve it, without getting into a back and forth. Once the problem is fixed, many customers update their review on their own. Keep every reply short.
If a review violates Google's policies, such as a review from someone who was never a customer or one with offensive content, you can flag it for removal. Do not expect removal for reviews that are simply negative. The best long term answer is a steady stream of new reviews from satisfied customers, so a single complaint becomes a small part of a much bigger picture. Ask every customer the same way, without filtering. Reply to the good reviews too, so your profile looks active.
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