First-try inspection pass rate
Which Scottsdale plumbing contractors pass on the first try
A ranked shortlist of plumbing contractors whose Scottsdale plumbing inspections pass on the first visit. Home builders and general contractors are listed separately. Ranked on the first-try pass rate from Scottsdale city records, not on job volume, reviews, or ads. The Scottsdale plumbers page ranked by jobs is a different list. This is how often a city inspector signed off on the first visit. It is not a grade of workmanship.
Last updated from Scottsdale city records through 2026-10-21. Verified against the Arizona Registrar of Contractors snapshot dated 2026-10-06.
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5 plumbing contractors in Scottsdale with 50+ first-try plumbing inspections, highest first-try pass rate first
- 77.0%
ROC 152654 · 107 of 139 · about even (76% mix) · through 2026-10-21
- 71.1%
Smaller sample: based on 76 inspections.
ROC 166455 · 54 of 76 · +5.1 pp vs 66% mix · through 2026-10-21
- 68.3%
Smaller sample: based on 63 inspections.
ROC 125007 · 43 of 63 · +6 pp vs 62% mix · through 2026-10-15
- 66.7%
Smaller sample: based on 54 inspections.
ROC 278981 · 36 of 54 · about even (65% mix) · through 2026-10-09
- 65.7%
Smaller sample: based on 67 inspections.
ROC 125239 · 44 of 67 · -13.7 pp vs 79% mix · through 2026-10-16
| Rank | Firm | License | First-try pass | Vs city mix | Counted |
|---|---|---|---|---|---|
| 1 | Parker and Sons (Environmental Conditioning LLC) | ROC 152654 | 77.0% | about even (76% mix) | 107 of 139 |
| 2 | Millennium Gas Services LLC Smaller sample: based on 76 inspections. | ROC 166455 | 71.1% | +5.1 pp vs 66% mix | 54 of 76 |
| 3 | Arizona Propane Co (Dawson Enterprises Inc) Smaller sample: based on 63 inspections. | ROC 125007 | 68.3% | +6 pp vs 62% mix | 43 of 63 |
| 4 | Gas Piping Inc Smaller sample: based on 54 inspections. | ROC 278981 | 66.7% | about even (65% mix) | 36 of 54 |
| 5 | Delta Plumbing Repipe and Drains (Delta Mechanical Inc) Smaller sample: based on 67 inspections. | ROC 125239 | 65.7% | -13.7 pp vs 79% mix | 44 of 67 |
Mix-adjusted city average uses the same kinds of Scottsdale plumbing inspections each contractor actually had. This is how often a city inspector signed off on the first visit. It is not a grade of workmanship.
How this ranking works
We show a rate only at 20+ first-try inspections. This list ranks at 50+. Pool contractor leaderboards rank at 25+ because pool jobs are big-ticket and lower-volume. A contractor is compared only with the same city and the same kinds of inspections. We never compare Mesa with Scottsdale, and we never mix a plumbing underground result into an electrical average. This list is trade specialists only. Home builders and general contractors (classes such as B, KB-1, and KB-2) are on the home builders first-try page. We group the remaining firms by the city's inspection type. When two first-try rates match at one decimal, the contractor with more inspections ranks higher. A smaller-sample note appears next to anyone with fewer than twice this list's rank floor. We never treat a partial approval as a pass.
How we count · Something wrong? · All first-try leaderboards
Frequently asked questions
- Who passes Scottsdale plumbing inspection on the first try most often?
- 5 plumbing contractors in Scottsdale with 50+ first-try plumbing inspections, highest first-try pass rate first. City records through 2026-10-21. This is how often a city inspector signed off on the first visit. It is not a grade of workmanship.
- How is this different from plumbing contractors in Scottsdale ranked by jobs?
- This page ranks by first-try inspection pass rate on Scottsdale plumbing inspections. The jobs page (/az/scottsdale/plumbing) ranks licensed plumbing contractors by how much Scottsdale work is on file. They answer different questions. Use both.
- How do you decide who counts as this trade?
- By the city's inspection type, among trade specialists only. Home builders and general contractors (classes such as B, KB-1, and KB-2) are listed separately. A firm appears here when Scottsdale credited plumbing inspections to its license. We show a rate only at 20+ first-try inspections. This list ranks at 50+. Pool contractor leaderboards rank at 25+ because pool jobs are big-ticket and lower-volume.
- Is this a grade of workmanship?
- This is how often a city inspector signed off on the first visit. It is not a grade of workmanship. A contractor is compared only with the same city and the same kinds of inspections. We never compare Mesa with Scottsdale, and we never mix a plumbing underground result into an electrical average.
- What if a number looks wrong?
- Tell us on the corrections page (/corrections). We check the city record and the license match by hand. We will not change a city inspector's written result.