Most of this guide has been about what a plumbing ad should say to win the call. This last chapter is about what it has to say, and what it can't, because a few lines in a plumbing ad answer to someone other than Google.
Three of them come up again and again: the license number, anything about lead pipes, and financing. Each has a rule behind it, the rules change by state and city, and the ads we read in our example market mostly skip them.
One note before the details: this chapter quotes the rules as written, but it isn't legal advice. Where the rules are unclear for a Google ad, it says so. Have counsel review anything you're unsure of.
11 of 12 Plumbing Sites Print a License Number. Only 1 of 578 Ads We Read Did.
There is no federal plumbing license. States license plumbers, and several cities do too. We read the rules in 12 states and cities, chosen across regions. Ten of them call for a license or registration number in plumbing advertising: Arizona, California, Florida, Georgia, Illinois, Massachusetts, New York City, Ohio, Texas and Washington, which asks for the contractor registration number. Colorado wants the numbers on the plumbing contractor's website, vehicles and bids, and says nothing specific about paid search. North Carolina puts the number on contracts and permits, and we found no advertising rule there.
The wording is broad. Texas, the state our example market sits in, says "all advertisements by a plumbing company designed to solicit plumbing business state the license number of the RMP of record, regardless of the type of media used." The RMP is the responsible master plumber. The Texas rule lists a few exceptions, such as national TV, a franchisor's internet ads for its franchisees, radio and phone calls, and signs at the shop. A local company's own Google ads aren't on the list. Georgia's newer law, which trade press reports took effect July 1, 2026, counts "newspaper, internet, social media and digital applications" as advertising.
Now the example market. Of the 12 plumbing and multi-trade companies whose sites we read there, 11 print a plumbing license number somewhere on the site. The formats wander: "ML," "MPL," "M-," "RMP," "Master License #" and, on one site, a bare number with no prefix at all.
The ads are a different story. We read 578 ads from the 51 advertisers in our example-market sample of Google's Ads Transparency Center, all shown within the past three months. One showed a plumbing license number: a Will Fix It ad carrying "MPL41408." Another 25 said the company was licensed without giving a number.
A search ad doesn't have much room, and none of the agencies we read says exactly how a 30-character headline should carry a license number. Two states spell out a shortcut. Arizona accepts internet advertising that "includes a website's uniform resource locator that directly links to a website that prominently displays the licensee's name and license number." Georgia accepts the number "or website address where such number can be found." For the rest, we found no guidance on space-limited search ads either way.
The license also matters to Google. Its policy on unacceptable business practices bars offering services you can't deliver, "including not having the right licenses or qualifications." So cover both places:
- In the ad. A callout asset like "Licensed RMP #12345" fits Google's 25-character limit. Use your real number and the prefix your state uses.
- On every landing page. Near the top, with the license holder's name where the state asks for it, not only in the footer.
- On every version. If the license number changes or a new master plumber becomes the license holder, update the callouts, the landing pages and the Business Profile on the same day.
A Lead Water Line Often Has Two Owners. Your Ad Has to Say Which Half You Replace.
A federal rule is about to put lead service lines in front of a lot of homeowners. The EPA's Lead and Copper Rule Improvements require water systems to comply "no later than November 1, 2027," to replace the lead and certain galvanized lines under their control within 10 years, and to publish an inventory that covers "both the portion of the service line owned by the water system and the portion of the service line owned by the customer."
That last phrase is the one that matters for a plumbing ad. A service line often has two owners. The rule obligates the water system, not the homeowner or the plumber, and how the homeowner's half gets paid for depends entirely on the town. Four utilities' own pages show the range:
- Salt Lake City: "Replacing these lead service lines at no cost to the homeowner."
- Indianapolis: lines in a designated project area "will be replaced at no cost to the customer provided that an approved Right of Entry Agreement is signed by the property owner."
- Chicago: a free replacement for households "below 80% of the area median income."
- Skokie, Illinois: the owner's cost for the private side is capped at $3,090, payable over 15 years on the water bill.
Our example market sits at a different point again. SAWS, the San Antonio water utility, says the customer-owned line "located between the water meter and the home, is the property of the homeowner and not part of the public water piping system maintained by SAWS." It offers a free inspection to homeowners whose line is listed as unknown, keeps a public address lookup, and notes that "Homes built before 1989 can have water service lines that are made of lead material." We didn't find a customer-side replacement program on its pages.
None of the 578 ads in our sample mentioned lead lines, and none of the 12 sites did. That's an opening, with three rules attached:
- Name the local program correctly. In a town that replaces the customer side for free, an ad selling lead line replacement has to explain why a homeowner would pay you, such as timing, or work the program doesn't cover.
- Say which half you replace. "We replace the homeowner's side, from the meter to the house" is a claim a homeowner can check against the utility's map.
- Never look like the utility. Google's policy on unacceptable business practices says ads can't "make it seem like you're affiliated with another brand, organization or government entity when you're not." "Official lead line replacement" next to the city's name is the line not to cross.
Lead-Free Is the Legal Floor for Every Plumber, Not a Selling Point
"Lead-free fixtures" shows up in plumbing copy as if it were a special feature. Under federal law, it's the minimum. The Safe Drinking Water Act definition allows "not more than a weighted average of 0.25 percent lead" on the wetted surfaces of pipes, fittings and fixtures, and the EPA says the law prohibits using anything that isn't lead free in drinking water plumbing. Since September 1, 2023, manufacturers and importers have needed third-party certification of it.
That makes "lead-free" a trust line, not a reason to choose you. Every legal installer meets it. The claim that does need care is the one about the home: the 2011 law lowered the limit "from 8% to a weighted average of 0.25%," so older brass in a house can't be called lead free without proof.
Put a Monthly Payment in a Plumbing Ad and the APR Has to Come With It
Repipes, sewer lines and water heaters are big enough tickets that financing shows up in a lot of plumbing advertising. Ten of the 12 example-market sites offer it. Three show an APR. One offers "0% for 60-month financing" on its home page and "0% financing for 72 months" on its ad landing page.
Financing ads answer to Regulation Z, the federal truth-in-lending rule, and it doesn't only bind lenders. Official commentary from the CFPB says "home builders, merchants, and others who are not themselves creditors must comply with the advertising provisions." Google lists "failing to disclose interest rates if applicable" among its dishonest pricing practices too. The rule turns on what it calls triggering terms. Put a payment amount, a number of payments, a repayment period or a down payment amount in the ad, and the ad also has to state the down payment, the terms of repayment and the APR. A rate has to be stated as an "annual percentage rate," using that term.
Of the 578 ads we read, 22 mentioned financing, and none stated an APR. One sold a repipe at "$99/mo" with "$0 upfront." A monthly payment is exactly the kind of term that triggers the full disclosure, and a 90-character description line has no room for it. The safer lines for a search ad are the ones the CFPB says don't trigger anything on their own, such as "no down payment," or a plain "Financing available," with the terms on the landing page.
Keeping every regulated line in a plumbing account matched to its source, from the license number to the financing terms, is part of the work our Google Ads management team does on every account.
Tracking First, Exact Match Next, AI Max Last. The Order Is What Books Plumbing Jobs.
A plumbing account that books jobs isn't built on a clever setting. It's built in order. It counts the calls and booked jobs first. It buys the searches that mean "come now" before the ones that mean "how do I," and puts each job on its own page. It goes broad only after exact match proves what a job costs, and adds Performance Max, Demand Gen and AI Max late, each behind a fence. Then the parts that are pure plumbing: emergency fees shown up front, water heaters split by what the searcher needs, and every regulated line matched to its rule.
The full guide, chapter by chapter, is at Google Ads for Plumbers, our sixteen-chapter guide for plumbing companies anywhere in the US.
This chapter describes rules as we read them in October 2026. It is not legal advice. Rules change and vary by state and city; have counsel review your advertising.
