The AI Visibility Gap
Every Pennsylvania plumber in our database has a website. Zero of them are invisible in that traditional sense. But 86% of them, roughly 650 out of 756 tracked contractors, have no JSON-LD structured data, which means AI assistants treating structured signals as a prerequisite for recommendations largely skip them.
That distinction matters more every month. AI-powered search tools don't browse websites the way humans do. They parse structured signals: schema markup, consistent identity data, verified credentials, review volume. Without those signals, a plumber with 20 years of experience and a clean website reads as a ghost.
The numbers confirm the gap is severe.
Pennsylvania plumbers average an AI Trust Score of 38.6/100. The median sits at 37.0/100. Only 0.7% of contractors score in the Excellent tier (80 to 100). At the other end, 11.9% score below 40, a range where AI recommendation engines have almost nothing to work with.
Score Tier Breakdown: Pennsylvania Plumbers
| Tier | Score Range | Share of Contractors |
|---|---|---|
| Excellent | 80-100 | 0.7% |
| Good | 60-79 | 15.7% |
| Fair | 40-59 | 71.7% |
| Below threshold | Under 40 | 11.9% |
The review data compounds the problem. The median review count across all 756 tracked plumbers is 0.0, meaning more than half have zero reviews on record. Reviews feed directly into the Legitimacy category, which carries 35 points of the 100-point AI Trust Score. A contractor with no reviews starts 35 points behind before Readability (40 points) and Identity (25 points) are even factored in.
The separation between top and bottom performers is not marginal. The top 10% average 66.1/100 and carry an average of 106 reviews. The bottom 50% average 29.6/100 with just 17 reviews. That's a 6.2x review gap producing a 36.5-point score gap.
Compared to peer markets, Pennsylvania sits in the middle of the pack. New York plumbers average 40.1/100, Ontario averages 39.6/100, and California averages 20.2/100. Pennsylvania's 38.6 average is competitive against California and Texas (30.3), but meaningfully below where any market needs to be to capture AI-driven referrals consistently.
The three scoring categories where Pennsylvania contractors lose the most ground:
- Identity (25 pts): Business name, address, and phone consistency across directories
- Legitimacy (35 pts): Review volume, ratings, and license or insurance verification
- Readability (40 pts): Website quality, JSON-LD structured data, and mobile performance
JSON-LD adoption at 14% means the Readability category is where the most ground is being lost, and where the fastest gains are available.
Check where you stand in the full Pennsylvania plumber directory or run your own audit at /find.
What AI Models Actually Check
When a homeowner asks an AI assistant to recommend a plumber in Pennsylvania, the model doesn't scroll through websites. It evaluates structured signals across three categories, each carrying a specific point weight that determines whether you appear in the response or get skipped entirely.
Identity: 25 points
This category measures whether your business name, address, and phone number are consistent across directories, your Google Business Profile, and your own website. Inconsistencies here, a different suite number on Yelp, an old phone number on a directory listing, cost you points that are straightforward to recover. NAP consistency is table stakes, but many Pennsylvania plumbers haven't audited their listings in years.
Legitimacy: 35 points
Reviews, ratings, and license or insurance verification make up the largest single category. Pennsylvania plumbers average 4.64 stars, which is a healthy rating signal. The problem is volume. The average review count is 34.0, but the median is 0.0. That means more than half of the 756 tracked contractors have zero reviews on record. A contractor with no reviews starts 35 points behind before the other two categories are even scored.
The separation between contractors who have invested in reviews and those who haven't is measurable. The top 10% of Pennsylvania plumbers average 106 reviews. The bottom 50% average 17. That 6.2x gap in review volume directly produces the 36.5-point score gap between those groups: 66.1/100 versus 29.6/100. When an AI assistant is choosing between two plumbers with similar websites and service areas, Legitimacy signals at this scale are often decisive.
Readability: 40 points
This is the highest-weighted category, covering website quality, JSON-LD structured data, and mobile performance. Every Pennsylvania plumber in the database has a website, so the Readability gap has nothing to do with website absence. It's driven entirely by what those websites communicate to machines.
Only 14% of Pennsylvania plumbers have JSON-LD structured data implemented. That means 86%, approximately 650 contractors, are presenting websites that AI models can't efficiently parse for service type, location, licensing, or contact details. The information may exist on the page, but without schema markup, it requires the model to infer rather than read, and models weight confident structured signals over inferred ones.
The practical result: Pennsylvania plumbers average 38.6/100 overall, with 71.7% in the Fair tier (40 to 59) and only 0.7% in the Excellent tier (80 to 100). The Readability category is where the most points are being lost, and it's also where a technical fix, adding JSON-LD to an existing website, can move a score faster than almost any other single change.
Run your own numbers at /find to see your current breakdown across all three categories.
Scoring Deep-Dive
Pennsylvania's score distribution tells a precise story: 41% of all 756 tracked plumbers land in the 30-39 band. That's not a spread, it's a cluster. The average (38.6/100) and median (37.0/100) sit almost on top of each other, confirming that most Pennsylvania plumbers are compressed into the same narrow performance range with very little separating them.
Full Score Distribution: Pennsylvania Plumbers
| Score Range | Contractors | Share |
|---|---|---|
| 10-19 | 5 | 1% |
| 20-29 | 157 | 21% |
| 30-39 | 309 | 41% |
| 40-49 | 149 | 20% |
| 50-59 | 63 | 8% |
| 60-69 | 60 | 8% |
| 70-79 | 9 | 1% |
| 80-89 | 3 | <1% |
| 90-100 | 1 | <1% |
Only 16 contractors (approximately 2.1% of the state) score 70 or above. That group is small enough that breaking into it represents a meaningful competitive advantage rather than a standard benchmark.
City-Level Scores
Pittsburgh averages 39.0/100. Philadelphia averages 38.3/100. The two largest plumbing markets in the state are separated by 0.7 points. That's not a geographic advantage story: it's evidence that the problems suppressing scores are structural and consistent across the state, not concentrated in any one market.
Pennsylvania vs. Peer States
| Market | Avg AI Trust Score | JSON-LD Adoption |
|---|---|---|
| New York | 40.1/100 | 14% |
| Ontario | 39.6/100 | 5% |
| Pennsylvania | 38.6/100 | 14% |
| Quebec | 39.3/100 | 4% |
| Illinois | 37.2/100 | 11% |
| Texas | 30.3/100 | 6% |
Pennsylvania's 38.6 average puts it ahead of Illinois (37.2) and well ahead of Texas (30.3), and its 14% JSON-LD adoption rate matches New York and significantly exceeds the national tracked average of 1.2%. That's a genuine structural advantage, but it applies to only 106 of 756 contractors. The other 650 are at the same baseline as markets with far lower adoption rates.
Where the Points Are Being Lost
The Readability category (40 points) is the single largest suppressant of scores across Pennsylvania. With 86% of contractors lacking JSON-LD, most plumbers are forfeiting a meaningful portion of those 40 points before any other factor is considered.
Legitimacy (35 points) is the second pressure point. The average review count is 34.0, but the median is 0.0. That median is not a rounding artifact: more than half of all tracked Pennsylvania plumbers have zero reviews on record. A small number of high-review contractors pull the average up while the majority of the market contributes nothing to Legitimacy scoring.
The top 10% average 66.1/100 with 106 reviews. The bottom 50% average 29.6/100 with 17 reviews. A 36.5-point gap within the same state, driven by two fixable variables: structured data and review volume.
Identity (25 points) shows the least variation, but inconsistent NAP data across directories is still a quiet score suppressor for contractors who haven't audited their listings recently.
The full breakdown by market and vertical is available in the Pennsylvania state report. To see your own score across all three categories, run your audit at /find or check the Pennsylvania plumber directory for context on where you stand relative to the state.
Action Steps: How to Close the Gap
The scoring system assigns points across three categories. The highest-leverage fixes track directly to the heaviest weights.
Start with Readability (40 points)
This is where 86% of Pennsylvania plumbers are leaving points on the table. Only 14% of the 756 tracked contractors have JSON-LD structured data implemented. That adoption gap means 650 plumbers are presenting websites that AI models can't efficiently parse for service type, location, or contact details.
Adding JSON-LD to your existing website is the single highest-impact action available to most Pennsylvania plumbers. You don't need a new website. You need machine-readable markup that tells AI systems what your site already says in human-readable form. Beyond JSON-LD, mobile performance and page speed factor into Readability scoring. A website that loads slowly or breaks on mobile costs points in a category worth nearly half your total score.
Specific fixes ranked by impact:
- Implement JSON-LD schema markup (service type, location, contact, license status)
- Audit mobile performance and fix rendering issues
- Improve page load speed, particularly on landing pages
Then Legitimacy (35 points)
The average rating across Pennsylvania plumbers is 4.64 stars. The quality signal is there. The volume is not. The median review count across all 756 tracked plumbers is 0.0, meaning more than half have zero reviews on record and are starting 35 points behind before Readability or Identity are scored.
The top 10% of Pennsylvania plumbers average 106 reviews and score 66.1/100. The bottom 50% average 17 reviews and score 29.6/100. That 6.2x review gap produces a 36.5-point score gap. The fix is systematic: ask every completed job for a review. Verify your license and insurance credentials on directory listings. An unverified license on a directory profile suppresses Legitimacy scoring even when the license itself is active.
Specific fixes ranked by impact:
- Build a post-job review request process (text or email within 24 hours of completion)
- Verify license and insurance status on your Google Business Profile and key directories
- Respond to existing reviews to signal ongoing engagement
Then Identity (25 points)
The Identity category measures consistency: your business name, address, and phone number across Google, Yelp, and other directories. A different suite number on one listing, an old phone number on another, these inconsistencies cost points that are recoverable without any technical work. The 71.7% of Pennsylvania plumbers clustered in the Fair tier (40-59) likely pass basic Identity checks but fail on Legitimacy and Readability. Identity is where you protect points already earned, not where you gain the most ground.
Specific fixes ranked by impact:
- Run a full NAP audit across Google Business Profile, Yelp, and any directory where your business appears
- Standardize your business name format (no abbreviations on some listings, full name on others)
- Update any phone numbers or addresses that changed in the past three years
The full Pennsylvania plumber directory shows where you stand relative to the state. Check your score across all three categories at /find.
Frequently Asked Questions
What is an AI Trust Score?
An AI Trust Score is a 100-point rating measuring how visible and credible your business appears to AI-powered search tools. The score breaks into three categories: Identity (25 points) for business name, address, and phone consistency across directories; Legitimacy (35 points) for review volume, ratings, and license or insurance verification; and Readability (40 points) for website quality, JSON-LD structured data, and mobile performance. Pennsylvania plumbers average 38.6/100. Only 0.7% of the 756 tracked contractors reach the Excellent tier (80 to 100). Check your current breakdown at /find.
How do plumbers get found by AI assistants?
AI assistants prioritize contractors whose information is structured, consistent, and verifiable. That means schema markup on your website, NAP consistency across directories, and a meaningful review volume. The top 10% of Pennsylvania plumbers average 66.1/100 and carry 106 reviews. The bottom 50% average 29.6/100 with just 17 reviews. That 6.2x review gap is one of the clearest signals AI models use when ranking local contractors against each other.
What is JSON-LD for plumbers?
JSON-LD is a type of structured data markup added to your website that tells AI models and search engines exactly what your business does, where you operate, and how to contact you. Without it, models have to infer that information from unstructured page text, and they weight confident structured signals more heavily. Only 14% of Pennsylvania plumbers have JSON-LD implemented. That leaves 86% of the market, roughly 650 contractors out of 756 tracked, with websites that AI systems can't efficiently parse. Nationally across all tracked markets, JSON-LD adoption averages just 1.2%, so Pennsylvania is ahead, but 86% of its plumbers still lack the signal entirely.
How do Pennsylvania plumbers compare to other states?
Pennsylvania averages 38.6/100, placing it above Illinois (37.2/100) and Texas (30.3/100), and just below New York (40.1/100) and Ontario (39.6/100). Its 14% JSON-LD adoption matches New York and exceeds the national tracked average of 1.2%. The structural advantage is real but narrow: it applies to roughly 106 contractors. The other 650 are operating at the same baseline as lower-adoption markets.
How many reviews does a plumber need to rank in AI searches?
There's no fixed threshold, but the data indicates a clear separation point. Pennsylvania plumbers in the top 10% average 106 reviews and score 66.1/100. Those in the bottom 50% average 17 reviews and score 29.6/100. The median review count across all 756 tracked Pennsylvania plumbers is 0.0, meaning more than half have zero reviews contributing to their Legitimacy score, a category worth 35 of 100 possible points. The state average rating is 4.64 stars, so quality is not the issue. Volume is. See the full Pennsylvania plumber directory for state context.