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Dittmann Plumbing vs Maz Plumbing Under Ground And Sewer Services
San Mateo Plumbing Contractors Comparison · Updated March 2026
Dittmann offers veteran status and full insurance protection, while Maz delivers faster service with hands-on ownership but lacks workers comp coverage.
| Dittmann Plumbing | Maz Plumbing Under Ground And Sewer Services | |
|---|---|---|
| Rating | ★ 3.9 | ★ 5.0 |
| Years Licensed | 50 years | 2 years |
| License # | 311169 | 1111601 |
| Workers' Comp | ✓ Yes | — |
| Bond Amount | $25,000 | $25,000 |
| Location | San Mateo, CA | San Mateo, CA |
| Website | www.dittmannplumbing.com | mazplumbing.com |
Key Differences
What Customers Say
Dittmann Plumbing
Customers consistently praise Dittmann's punctuality, detailed explanations of repair processes, and responsive communication throughout projects.
Maz Plumbing Under Ground And Sewer Services
Maz receives strong feedback for rapid emergency response including weekends, transparent upfront pricing, clean worksites, and the owner's direct hands-on involvement in every project.
Key Takeaway: Maz demonstrates significantly faster emergency availability and same-day service patterns, while Dittmann emphasizes scheduled reliability and thorough communication with assigned technicians.
Customer Reviews
Dittmann Plumbing
Always responsive in a timely manner and reasonable.
It was a pleasure doing business with the folks at Dittman. They are punctual, knowledgeable, efficient, and professional. Don and Dave helped snake the kitchen drain, Maria answered my many questio...
These fellas know what it takes to resolve most every plumbing issue!
Maz Plumbing Under Ground And Sewer Services
Fantastic experience with Al - quality work and great service! Al did an excellent job installing my new bathtub, shower kit, valves, and bath spout. His workmanship is top-notch, everything looks and...
Maz plumbing is SUPERB. Family owned (the actual owner, Al, comes in to do the work with his helper), he has been in business for almost 30 years. Top quality, speed, clear communication, honest, tid...
Al is the only plumber you need to know around this area. I have hired many plumbing companies before I got to know Al and hated all of them so much. Especially big plumbing companies that send out am...
Consider Dittmann Plumbing if...
- ✓ You want maximum liability protection with workers compensation insurance verified on file, eliminating risk to your homeowner's policy if accidents occur during the job.
- ✓ Your home is older and may have hidden complications requiring the diagnostic experience that comes from 50 years of navigating San Mateo's plumbing infrastructure and code changes.
- ✓ You prefer working with an established multi-technician company that has maintained continuous licensing and business operations across multiple generations.
- ✓ You value detailed explanations of repair processes and consistent punctuality over rapid emergency response times.
Consider Maz Plumbing Under Ground And Sewer Services if...
- ✓ You need same-day or emergency plumbing service and value rapid response over waiting for scheduled availability from a larger operation.
- ✓ You specifically want the business owner directly performing your work rather than an assigned technician, ensuring consistent accountability.
- ✓ Transparent upfront pricing is your priority, and reviews suggest Maz provides clear estimates before starting work with competitive rates.
- ✓ You're comfortable verifying your homeowner's insurance covers contractor injuries, since workers comp is not on file, and the owner typically works jobs personally or with assistants.
Questions to Ask Before Hiring
- → For Maz Plumbing: Ask to confirm your homeowner's insurance policy covers injuries to contractors and their assistants working on your property, given the absence of workers comp coverage.
- → For Dittmann: Request a detailed written estimate for installation projects to understand their pricing structure, as some customers found quotes higher than anticipated.
- → For Maz Plumbing: Ask for references from customers whose projects occurred during the two-year licensed period to verify continuity between claimed experience and current business operations.
- → For both: Clarify emergency availability, response timeframes, and after-hours service costs to match your specific timeline needs.
The Bottom Line
For most homeowners prioritizing protection and proven longevity, Dittmann's 50-year track record and workers compensation coverage provide substantially lower risk despite potentially higher installation costs. However, if you need emergency service this week, want the owner directly handling your project, and can verify your homeowner's insurance covers contractor injuries, Maz delivers faster response times and transparent pricing with strong customer satisfaction. The workers comp gap is the deciding factor: if liability protection matters more than speed, choose Dittmann; if you need immediate service and accept the insurance responsibility, Maz's hands-on approach has earned loyal repeat customers.
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Frequently Asked Questions
If a plumber or assistant is injured on your property and the company lacks workers comp, they could file a claim against your homeowner's insurance, potentially affecting your rates or coverage. Even simple repairs involve risks like slips, lifting water heaters, or working in confined spaces. With Dittmann's workers comp coverage, their insurance handles worker injuries; with Maz, you should verify your policy protects you.
Dittmann's 50-year license means the business entity has maintained continuous compliance, bonding, and operations through multiple code changes and housing generations in San Mateo. Maz's owner may have three decades of hands-on work, but the business itself has only held formal licensing for two years, meaning less documented track record of the company's performance, dispute resolution, and customer satisfaction patterns.
Customer feedback strongly suggests Maz excels at rapid response, with many reviews noting same-day, next-day, and weekend emergency availability. Dittmann receives praise for punctuality on scheduled appointments but doesn't show the same pattern of immediate emergency response in reviews. If speed is critical, ask Maz about current availability; if you can schedule ahead, either works.
Some Dittmann customers mention finding installation quotes higher than expected, though service quality remains praised. Maz reviews consistently highlight transparent upfront pricing and fair rates, with customers frequently mentioning competitive costs. For major installations like water heaters or fixture replacements, getting written estimates from both will reveal actual price differences for your specific project.
Looking for the Best?
See our ranked list of top plumbing contractors in San Mateo.
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 12, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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