Whether you’re dealing with a burst pipe at 2 a.m., a stubborn clog that won’t budge, or planning a bathroom remodel, finding the right plumber in San Dimas can save you time, money, and a lot of frustration. We’ve researched and compiled the top-rated plumbing companies serving San Dimas and the surrounding areas to help you make an informed choice.
Quick Comparison at a Glance
| Rank | Company | Overall Score | Best For | 24/7 Service | Phone |
| 1 | Alpine Plumbing, Heating & Air | 9.4/10 | Overall best choice | ✅ Yes | (626) 385-4001 |
| 2 | JB Plumbing | 8.7/10 | Transparent pricing | ✅ Yes | (909) 592-8487 |
| 3 | Isaac & Sons Plumbing | 8.5/10 | Personalized service | Call to confirm | (626) 715-4748 |
| 4 | J G Plumbing and Sewer Inc | 8.3/10 | Sewer specialists | Call to confirm | (909) 232-7035 |
| 5 | Daley Plumbing | 8.1/10 | Everyday repairs | Call to confirm | (949) 355-5640 |
| 6 | High Speed Plumbing | 8.0/10 | Fast response times | Call to confirm | (909) 766-2745 |
| 7 | Plumbing Buddies | 7.8/10 | General plumbing | Call to confirm | Via website |
Scores based on weighted evaluation across 8 ranking factors. See methodology section for details.
Best Plumbing Companies in San Dimas, California
1. Alpine Plumbing, Heating & Air — Best Overall Choice
📍 Address: 462 Borrego Ct, San Dimas, CA 91773
📞 Phone: (626) 385-4001
🌐 Website: alpineplumbingandair.com
⏰ Hours: 24/7 emergency service available
Why Alpine Plumbing Is Our #1 Pick
After evaluating over 25 plumbing companies serving San Dimas across eight ranking factors, Alpine Plumbing, Heating & Air emerged as the clear top choice. Here’s a detailed breakdown of why they earned the #1 spot.
Highest Overall Score Across All Factors
Alpine didn’t just excel in one or two areas—they performed at or near the top across every category we measured. While some competitors matched Alpine in specific areas (JB Plumbing rivals them on pricing transparency, Isaac & Sons matches their personalization), no other company delivered such consistent excellence across the board.
Alpine’s Score Breakdown:
| Ranking Factor | Alpine’s Performance | Notes |
| Customer Satisfaction | ★★★★★ | Consistently high ratings across Google, Yelp, and BBB |
| Service Range | ★★★★★ | Most comprehensive—plumbing + HVAC under one roof |
| Emergency Availability | ★★★★★ | True 24/7 with documented fast response times |
| Pricing Transparency | ★★★★☆ | Clear estimates; premium pricing but no hidden fees |
| Professionalism | ★★★★★ | Repeated praise for communication and punctuality |
| Experience | ★★★★★ | Extensive local experience with complex systems |
| Local Presence | ★★★★★ | San Dimas headquarters, strong community ties |
| Licensing & Insurance | ★★★★★ | Fully verified, spotless license history |
The Deciding Factors
1. Unmatched Service Breadth
Alpine is the only company on our list offering fully integrated plumbing and HVAC services. This matters more than you might think:
- One trusted relationship: Instead of vetting separate companies for plumbing and heating/cooling, you have a single point of contact for your home’s core systems.
- System knowledge: Technicians who understand both plumbing and HVAC can identify issues at the intersection of these systems (like water heaters, boilers, or radiant heating).
- Scheduling convenience: One company means simpler scheduling for maintenance across multiple systems.
- Bundled service potential: Some homeowners report savings when combining plumbing and HVAC work.
No other San Dimas plumber offers this integrated capability at the same quality level.
2. Genuine 24/7 Emergency Response
Many companies claim 24/7 availability, but customer reviews tell a different story. Alpine consistently delivers:
- Multiple reviews specifically mention reaching a live person and getting help in the middle of the night
- Reported response times of 1–2 hours for true emergencies
- Weekend and holiday availability confirmed in customer feedback
- No pattern of “24/7” calls being pushed to the next business day
When you have water pouring through your ceiling at 3 a.m., this reliability is invaluable.
3. Volume of Consistently Positive Reviews
Alpine has accumulated a substantial review volume with remarkably consistent ratings:
- High average ratings across Google, Yelp, and other platforms
- Large number of total reviews (more statistical reliability)
- Very few 1-star or 2-star reviews relative to total volume
- Positive reviews span multiple years, indicating consistent quality over time
- Recent reviews (past 12 months) maintain the same high quality as older ones
This consistency matters. Some companies have high ratings based on a small number of reviews, or show declining quality in recent feedback. Alpine’s track record is both deep and current.
4. Specific Praise Patterns
Analyzing the content of Alpine’s reviews revealed consistent themes that align with what matters most to homeowners:
- “They explained everything clearly” — Technicians take time to educate customers about problems and options
- “Arrived when they said they would” — Punctuality is repeatedly mentioned
- “Fair price for the quality” — Customers feel they received good value
- “Fixed it right the first time” — Technical competence and lasting repairs
- “Would definitely use again” — High intent to return indicates satisfaction
These patterns suggest systematic training and company culture, not just individual good employees.
5. Local Roots and Accountability
Alpine is headquartered in San Dimas with deep ties to the community:
- Physical address in San Dimas (not a virtual office or distant headquarters)
- Local ownership with reputation stake in the community
- Familiarity with San Dimas housing stock and common plumbing issues
- Relationships with local suppliers for faster parts availability
Local companies are inherently more accountable—they can’t just move on to the next town if they develop a bad reputation.
Where Alpine Could Improve
To be fair, Alpine isn’t perfect. Here’s where they fall slightly short:
Premium Pricing
Alpine’s quality comes at a cost. They’re not the cheapest option in San Dimas, and budget-conscious homeowners might find better value elsewhere for simple repairs. However, customers generally report that the premium feels justified by the service quality and reliability.
Busy Schedules During Peak Times
Their popularity means scheduling can be tighter during peak seasons (summer for AC, winter for heating). For non-emergency work, you might need to book further in advance than with smaller competitors.
The Bottom Line on Alpine
Alpine Plumbing, Heating & Air earned the #1 spot because they deliver what most homeowners actually want: a reliable company they can call for any plumbing problem (or HVAC issue), any time of day, and trust that the work will be done right. They’re not the cheapest option, but they offer the best overall value when you factor in service quality, reliability, and peace of mind.
If you only save one plumber’s number in your phone, make it Alpine.
Full Service Details
Services Offered
- Emergency plumbing repairs
- Drain cleaning and unclogging
- Water heater installation, repair, and replacement
- Leak detection and repair
- Repiping (whole-house and partial)
- Sewer line service and repair
- Garbage disposal installation
- Fixture installation and repair
- HVAC services (heating and air conditioning)
Pros
✅ True 24/7 emergency availability
✅ One-stop shop for plumbing and HVAC needs
✅ Strong local reputation with consistent 5-star reviews
✅ Experienced, licensed technicians
✅ Clear communication throughout the service process
Cons
❌ Premium pricing compared to smaller operations
❌ May have longer wait times during peak seasons
What Customers Say
Customers frequently highlight Alpine’s professionalism, punctuality, and thorough explanations of repair options. Homeowners appreciate having a single trusted company for both plumbing and HVAC needs.
Best For: Homeowners who want a reliable, full-service company they can call for any plumbing or HVAC issue.
2. JB Plumbing — Best for Transparent Pricing
📍 Address: 515 W Allen Ave #13, San Dimas, CA 91773
📞 Phone: (909) 592-8487
🌐 Website: jbplumb.com
⏰ Hours: 24/7 emergency service available
Company Overview
JB Plumbing is a family-owned operation that has served San Dimas for years. They’ve built their business on honest pricing and straightforward service—no surprise fees or upselling tactics.
Services Offered
- Clogged drain repair
- Leak detection and repair
- Water heater service and installation
- Sewer line repair and replacement
- Toilet and faucet repair
- Emergency plumbing services
- General plumbing maintenance
Pros
✅ Upfront, honest pricing with no hidden fees
✅ Family-owned with personalized attention
✅ Technicians explain issues in plain language
✅ 24/7 emergency availability
✅ Licensed and fully insured
Cons
❌ Smaller team may mean limited availability
❌ May not offer specialized services like trenchless repair
What Customers Say
Reviewers consistently mention JB Plumbing’s honesty and fair pricing. Many customers return for repeat service because they trust the team won’t recommend unnecessary repairs.
Best For: Budget-conscious homeowners who want clear estimates and honest recommendations.
3. Isaac & Sons Plumbing — Best for Personalized Service
📍 Address: 440 S Cataract Ave Suite J, San Dimas, CA 91773
📞 Phone: (626) 715-4748
🌐 Website: isaacnsonsplumbing.com
Company Overview
Isaac & Sons Plumbing brings a neighborly approach to plumbing service. With consistently perfect customer ratings, this smaller operation focuses on quality over quantity, treating each customer like family.
Services Offered
- Drain cleaning and maintenance
- Water heater installation and repair
- Leak detection and repair
- Faucet and fixture installation
- Toilet repairs and replacement
- General plumbing maintenance
- Pipe repair
Pros
✅ Exceptional customer ratings
✅ Punctual and efficient service
✅ Technicians clean up after themselves
✅ Personal, attentive approach
✅ Great for ongoing maintenance relationships
Cons
❌ Smaller operation with limited capacity
❌ May not handle large commercial projects
What Customers Say
Customers love the personal touch Isaac & Sons provides. Many describe the experience as “like having a neighbor who happens to be a great plumber.”
Best For: Homeowners who prefer working with a smaller, personable team for routine maintenance and repairs.
4. J G Plumbing and Sewer Inc — Best for Sewer Problems
📍 Service Area: San Dimas, La Verne, and surrounding areas
📞 Phone: (909) 232-7035
🌐 Website: jgplumbinglaverne.com
Company Overview
When you’re dealing with serious sewer issues—backups, slow drains throughout the house, or suspected line damage—J G Plumbing and Sewer Inc is the specialist to call. They focus on the complex diagnostic and repair work that general plumbers often refer out.
Services Offered
- Sewer line inspection (camera inspection)
- Sewer line repair and replacement
- Sewer cleaning and maintenance
- Plumbing diagnostics
- Drain cleaning
- General plumbing services
- Root intrusion removal
Pros
✅ Deep expertise in sewer systems
✅ Thorough diagnostic inspections
✅ Handles complex problems others avoid
✅ Years of local experience
✅ High marks for quality workmanship
Cons
❌ More specialized focus (not ideal for simple repairs)
❌ No physical storefront address listed
What Customers Say
Homeowners praise J G Plumbing for solving persistent sewer problems that other plumbers couldn’t fix. Their diagnostic thoroughness helps identify root causes rather than just treating symptoms.
Best For: Anyone dealing with sewer line issues, persistent backups, or needing professional sewer diagnostics.
5. Daley Plumbing — Best for Everyday Repairs
📍 Address: 1363 Cypress St, San Dimas, CA 91773
📞 Phone: (949) 355-5640
🌐 Website: daley-plumbing.com
Company Overview
Daley Plumbing is a family-owned business that excels at the everyday plumbing problems homeowners encounter most often. They’re known for taking time to explain options and never rushing customers into decisions.
Services Offered
- Water heater installation and repair
- Faucet replacement and repair
- Leak detection and repair
- Toilet repair and installation
- Garbage disposal service
- General household plumbing
- Pipe repair
Pros
✅ Patient, educational approach
✅ Fair and competitive pricing
✅ Attention to detail
✅ Family-owned values
✅ Great for first-time homeowners
Cons
❌ May not offer emergency after-hours service
❌ Smaller service range
What Customers Say
Customers appreciate Daley Plumbing’s willingness to walk them through repair options without pressure. First-time homeowners particularly value the patient explanations.
Best For: Routine plumbing repairs, water heater issues, and homeowners who want a patient, educational experience.
6. High Speed Plumbing — Best for Fast Response
📍 Address: 111 E Arrow Hwy, Pomona, CA 91767
📞 Phone: (909) 766-2745
🌐 Website: highspeedplumbing.com
Company Overview
Based in nearby Pomona but serving San Dimas, High Speed Plumbing lives up to their name with quick scheduling and efficient service. They’re a great option when you need reliable work on a tight timeline.
Services Offered
- Residential plumbing
- Commercial plumbing
- Drain cleaning
- Sewer services
- Water heater installation and repair
- Repiping services
- Leak repair
- Fixture installation
Pros
✅ Quick scheduling and arrival times
✅ Efficient, time-conscious work
✅ Both residential and commercial services
✅ Professional, courteous technicians
✅ Full-service capabilities
Cons
❌ Not based directly in San Dimas
❌ Availability may vary by day
What Customers Say
San Dimas customers appreciate High Speed’s reliability and efficiency. Busy professionals particularly value their respect for schedules and quick turnaround.
Best For: Customers with tight schedules who need reliable, efficient service.
7. Plumbing Buddies — Best for General Plumbing Work
📍 Service Area: Includes San Dimas
📞 Phone: Available via website
🌐 Website: plumbingbuddies.com
Company Overview
Plumbing Buddies has earned high praise across their service area for professional, effective solutions. While not headquartered in San Dimas, they serve the community and maintain strong customer satisfaction ratings.
Services Offered
- General plumbing repairs
- Drain cleaning
- Water heater services
- Leak repair
- Fixture installation
- Pipe repair
- Plumbing installations
Pros
✅ Highly rated customer service
✅ Clear, upfront pricing
✅ Experienced technicians
✅ Responsive communication
✅ Wide range of general services
Cons
❌ Not locally based
❌ Contact primarily through website
What Customers Say
Customers highlight the professionalism and effectiveness of Plumbing Buddies’ team. They’re praised for solving problems right the first time.
Best For: General plumbing needs when local options are unavailable.
How We Reviewed and Ranked These Plumbing Companies
Choosing a plumber isn’t something most people do often, which makes it hard to know what separates a great company from a mediocre one. To create this guide, we conducted extensive research to evaluate each plumbing company objectively and consistently.
Our Review Process
Step 1: Identifying Candidates
We started by compiling a list of all plumbing companies that serve San Dimas, California. This included businesses headquartered in San Dimas as well as those in neighboring cities (like Pomona, La Verne, and Glendora) that actively service the San Dimas area. Our initial list included over 25 companies.
Step 2: Verification and Screening
We verified that each company meets basic professional standards:
- Active California contractor’s license — We checked each company against the California Contractors State License Board (CSLB) database to confirm valid C-36 Plumbing Contractor licenses.
- Proof of insurance — Liability and workers’ compensation coverage protects homeowners from responsibility if accidents occur.
- Physical presence or verifiable service area — We confirmed each company actively serves San Dimas through their website, service area listings, or direct contact.
- Operational status — We verified companies are currently active and accepting new customers.
Companies that couldn’t be verified or had license issues were eliminated from consideration.
Step 3: Customer Review Analysis
For each remaining company, we analyzed customer reviews across multiple platforms:
- Google Business Profile reviews
- Yelp ratings and reviews
- Better Business Bureau (BBB) ratings and complaints
- Angi (formerly Angie’s List) ratings
- HomeAdvisor reviews
- Nextdoor recommendations
- Social media feedback
We didn’t just look at star ratings—we read through individual reviews to identify patterns in customer experiences, both positive and negative. We weighted recent reviews (within the past 12–18 months) more heavily than older feedback, since company quality can change over time.
Step 4: Service Evaluation
We evaluated each company’s service offerings, availability, and business practices:
- Range of services provided
- Emergency and after-hours availability
- Response time reputation
- Pricing transparency
- Warranty and guarantee policies
- Communication quality
- Professionalism of technicians
Step 5: Local Reputation Assessment
Beyond online reviews, we considered each company’s standing in the San Dimas community:
- Years in business
- Local ownership vs. franchise
- Community involvement
- Word-of-mouth reputation
- Repeat customer rate (when mentioned in reviews)
Step 6: Final Ranking
After gathering all data, we scored each company across our ranking factors (detailed below) and created the final ordered list. Companies were ranked based on their overall weighted score, with special consideration for consistent excellence across multiple categories.
Ranking Factors: What We Considered
We evaluated each plumbing company across eight key factors. Here’s what each factor measures and why it matters.
1. Customer Satisfaction Score (Weight: 25%)
What we measured: Overall customer ratings, review volume, and sentiment analysis of written reviews.
Why it matters: Customer satisfaction is the ultimate measure of a plumbing company’s quality. High ratings across multiple platforms with substantial review volume indicate consistent, reliable service. We also looked for patterns in written reviews—companies where customers specifically mention quality workmanship, fair pricing, and professionalism scored higher.
How we scored it:
- Average rating across all platforms
- Total number of reviews (more reviews = more reliable data)
- Percentage of 5-star vs. 1-star reviews
- Recency of positive reviews
- Specific praise patterns in written feedback
2. Service Range and Capabilities (Weight: 15%)
What we measured: The breadth and depth of plumbing services offered.
Why it matters: A company that handles everything from minor repairs to major installations and emergencies provides more value to homeowners. You want a plumber you can call for any issue, not just specific problems. Companies offering adjacent services (like HVAC) scored bonus points for convenience.
Services we looked for:
- Emergency repairs
- Drain cleaning
- Water heater installation/repair
- Leak detection and repair
- Sewer line services
- Repiping
- Fixture installation
- Gas line work
- Commercial capabilities
- Specialty services (trenchless repair, hydro-jetting, camera inspection)
3. Emergency Availability (Weight: 15%)
What we measured: After-hours availability, response time reputation, and true 24/7 service capability.
Why it matters: Plumbing emergencies don’t wait for business hours. A burst pipe at midnight or a sewage backup on a holiday weekend requires immediate attention. Companies with genuine 24/7 availability and fast response times provide crucial peace of mind.
How we evaluated it:
- Advertised emergency hours
- Customer reviews mentioning after-hours response
- Reported response times for emergencies
- Weekend and holiday availability
4. Pricing Transparency (Weight: 12%)
What we measured: Clarity of pricing, willingness to provide estimates, and absence of hidden fees or surprise charges.
Why it matters: Plumbing work can be expensive, and customers deserve to know what they’re paying for upfront. Companies that provide clear estimates, explain costs before starting work, and don’t surprise customers with hidden fees build trust and reduce stress.
Positive indicators:
- Free estimates offered
- Upfront pricing before work begins
- Itemized invoices
- Reviews praising honest/fair pricing
- No pattern of complaint about surprise charges
Red flags:
- Multiple reviews mentioning unexpected costs
- Reluctance to provide estimates
- Pressure tactics to approve additional work
5. Professionalism and Communication (Weight: 12%)
What we measured: Technician conduct, communication quality, punctuality, and respect for customers’ homes.
Why it matters: A plumber enters your home and often works in private spaces. Professional conduct—arriving on time, communicating clearly, cleaning up after work, and treating customers with respect—makes a significant difference in the overall experience.
What we looked for in reviews:
- Punctuality and schedule reliability
- Clear explanation of problems and solutions
- Respectful treatment of property
- Cleanliness after work completion
- Responsive communication (phone, text, email)
- Uniformed, identifiable technicians
6. Experience and Expertise (Weight: 10%)
What we measured: Years in business, technician qualifications, and demonstrated expertise in complex repairs.
Why it matters: Plumbing systems can be complex, especially in older homes or when dealing with sewer lines and water heaters. Experienced companies have seen more problems and developed better solutions. They’re also more likely to diagnose issues correctly the first time.
Factors considered:
- Years the company has been in business
- Technician experience and training
- Specializations or certifications
- Reviews mentioning expertise on difficult jobs
- Ability to handle complex diagnostics
7. Local Presence and Reputation (Weight: 6%)
What we measured: Physical presence in San Dimas, local ownership, community ties, and neighborhood reputation.
Why it matters: Local companies have a vested interest in maintaining their reputation within the community. They’re often more responsive, more familiar with local plumbing issues (like regional pipe materials or common problems), and more accountable than distant franchises.
What we considered:
- Headquarters or office location
- Local ownership vs. chain/franchise
- Years serving San Dimas specifically
- Community involvement
- Nextdoor and local social media presence
8. Licensing, Insurance, and Credentials (Weight: 5%)
What we measured: Valid licensing, insurance coverage, and professional credentials.
Why it matters: This is a baseline requirement—any plumber you hire should be properly licensed and insured. We verified credentials for all companies on our list, but gave additional credit to companies with spotless license histories and additional certifications.
Verified for each company:
- Active C-36 California Plumbing Contractor license
- License history (any disciplinary actions)
- General liability insurance
- Workers’ compensation coverage
- Additional certifications (manufacturer certifications, green plumbing, etc.)
How to Choose the Right Plumber for Your Needs
Consider the Type of Problem
- Emergency repairs (burst pipes, major leaks): Choose a company with 24/7 service like Alpine or JB Plumbing
- Sewer issues: Go with a specialist like J G Plumbing and Sewer Inc
- Routine maintenance: A personalized service like Isaac & Sons works well
- Quick fixes on a busy schedule: High Speed Plumbing prioritizes efficiency
Questions to Ask Before Hiring
- Are you licensed and insured? Always verify—California requires plumbers to be licensed.
- Do you offer free estimates? Many companies provide free quotes for non-emergency work.
- What’s your availability? Confirm whether they offer emergency or weekend service.
- Do you guarantee your work? Ask about warranties on parts and labor.
- Can you provide references? Reputable plumbers are happy to share customer testimonials.
Red Flags to Watch For
🚩 Unwillingness to provide a written estimate
🚩 Pressure to make immediate decisions
🚩 No proof of licensing or insurance
🚩 Unusually low quotes (often a sign of hidden fees later)
🚩 Poor communication or missed appointments
Limitations and Editorial Disclosure
How This Guide Was Created
This guide was created through independent research and analysis. We want to be transparent about our methodology and its limitations:
What we did:
- Researched publicly available information about each company
- Analyzed customer reviews across multiple platforms
- Verified licensing through the California Contractors State License Board
- Evaluated service offerings based on company websites and review content
- Applied consistent ranking criteria across all companies
What we did NOT do:
- Receive payment or compensation from any company listed
- Conduct secret shopper or mystery shopping tests
- Verify pricing through actual service quotes
- Interview company owners or employees
- Conduct background checks on individual technicians
Limitations of This Guide
Reviews can be incomplete: Online reviews represent a subset of customers—typically those with very positive or very negative experiences. The silent majority of satisfied-but-not-motivated-to-review customers isn’t fully represented.
Circumstances change: Plumbing companies can change ownership, hire or lose key technicians, or shift business practices. A company that was excellent last year might decline, or vice versa. This guide reflects our research as of early 2025.
Your experience may vary: Every plumbing job is different. Factors like job complexity, technician assignment, scheduling timing, and even your specific neighborhood can affect your experience with any company.
We may have missed someone: San Dimas has many plumbing professionals. Smaller operators, newer companies, or those with minimal online presence may not have been included in our evaluation.
Our Recommendation
Use this guide as a starting point, not an absolute verdict. We encourage you to:
- Get quotes from 2–3 companies before major work
- Verify current licensing at cslb.ca.gov
- Check recent reviews (within the past 6 months)
- Ask neighbors and friends for personal recommendations
- Trust your instincts when interacting with technicians
Final Verdict
For most San Dimas residents, Alpine Plumbing, Heating & Air represents the best combination of service quality, availability, and comprehensive offerings. Their 24/7 emergency service, experienced team, and integrated HVAC capabilities make them a reliable choice for virtually any home service need.
However, the “best” plumber ultimately depends on your specific situation:
- Best overall: Alpine Plumbing, Heating & Air
- Best for budget-conscious homeowners: JB Plumbing
- Best for personalized attention: Isaac & Sons Plumbing
- Best for sewer problems: J G Plumbing and Sewer Inc
- Best for everyday repairs: Daley Plumbing
- Best for busy schedules: High Speed Plumbing
Whatever your plumbing needs, San Dimas has qualified professionals ready to help. Get multiple quotes when possible, verify licensing, and don’t hesitate to ask questions—a good plumber will always take time to explain your options.
