Every month we ask the four most-used AI assistants the same three questions about one trade in one city, and publish what they say. This is the [Month Year] reading for emergency and general plumbing in Tucson, Arizona.

The point isn't a ranking. The assistants don't rank; they name two or three businesses and stop. The point is to show, with the actual answers, who is on those short lists right now — and what the businesses on them have in common.

What we asked, and how

Three questions, phrased the way a homeowner would type them:

• "What are the best emergency plumbers in Tucson, AZ?"
• "Can you recommend a plumber near Tucson, AZ?"
• "Who are the top-rated plumbing businesses in Tucson?"

Each was asked of ChatGPT, Claude, Perplexity and Gemini on [date], through their APIs, with no business named in the prompt. Twelve answers in total. We recorded every business named, every website linked, and every source the assistants cited. Full method on the How it works page; the honest caveats about variance are in the note on why answers change.

Who the assistants named

[Business A] was the closest thing to a consensus: [n] of the four assistants named it, and [n] linked to its website directly rather than to a directory. [Business B] appeared almost as often but was linked only through [Yelp/Angi], which means customers who follow the recommendation land on a third-party page rather than the company's own.

Beyond those two, the lists diverged. [Business C] appeared only in Perplexity's answers, which cite live search results; [Business D] appeared only in ChatGPT's, which lean on Bing. That split is common and it tells you which index each business is strong in.

Who the assistants cited instead

The domains that appeared most often across all twelve answers, whether or not they belong to a plumber:

• [businessa.example] — [n] citations
• [yelp.com] — [n]
• [angi.com] — [n]
• [businessb.example] — [n]
• [azroc.gov] — [n] (the assistants use the Registrar of Contractors to confirm licences)
• [nextdoor.com] — [n]

Read this list as the assistants' source diet for Tucson plumbing. A business that isn't on the two or three directories here, with matching name, address and phone, is asking the assistants to find it the hard way.

How many Tucson plumbers never came up

We ran the same three questions against [20] Tucson plumbing businesses drawn from the top of Google Maps — active companies, most with strong review profiles. [n] of the [20] appeared in at least one answer. [n] never appeared in any.

That's not a judgement on their work. Several of the absent businesses have review scores as good as anyone on the list above. It's a statement about legibility: the assistants either couldn't read their sites, couldn't tell what they were, or didn't find them in the sources they trust.

What the recommended businesses have in common

We ran the 19-point readiness audit on every business in the sample. The ones the assistants named shared a few checkable traits that the absent ones mostly lacked:

• [All/Most] had LocalBusiness or Plumber schema on the homepage with a full address. [n] of the absent businesses had none.
• [n] of the named businesses had a FAQ page with question-style headings, and [n] listed prices. [n] of the absent businesses had any FAQ content.
• Every named business allowed AI crawlers in robots.txt. [n] of the absent businesses were blocking GPTBot or ClaudeBot — usually via a security plugin default.
• The named businesses' title tags said "plumber" and "Tucson." [n] of the absent businesses' homepage titles were the company name alone.

Reviews, notably, did not separate the groups. Several absent businesses had more reviews than the consensus pick.

What changed since last month

• [Business C] entered Perplexity's list for the first time.
• [Business E] dropped from two answers to none.
• [Directory] appeared as a cited source for the first time.

If you're a Tucson plumber

If your business is on the list above, the trend matters more than the position, and we'd suggest keeping an eye on it — the third slot on these lists changes hands most months.

If you're not on it, the free readiness scan will tell you in a minute whether the reason is one of the four traits above. Most of them are a week's work, not a rebuild.

Next month's reading will run on [date]. If you'd like the update when it publishes, the notes go out by email once a week and never more.

Method: three customer-style questions per assistant, asked via API on [date] without any business named in the prompt. "Named" means the assistant used the business name; "linked" means it included the website in the text or its sources. Assistants are probabilistic and answers vary between runs; treat a single month as a reading, not a verdict. Readiness audits use the 19 deterministic checks described on the How it works page. Duly Noted has no relationship with any business in this report.