Pasadena, Monrovia & the San Gabriel Valley, CA
Professional plumbing — All Systems Professional Plumbing Service in Pasadena, Monrovia & the San Gabriel Valley, CA
- Open 24/7 365 days
- 5★ on Yelp 62 reviews
- Licensed · Bonded · Insured
Plumbing Residential Commercial Open 24/7
Water heaters, drains, sewer, and gas lines — skilled technicians, transparent pricing, and honest recommendations. Open 24/7 across the San Gabriel Valley.
Special New Customer Offer: Save $50 on Your First Service Call See all offers →Every pipe in the house, one crew.
Which sounds like your house?
Skip the menu — tell us the symptom and we'll point you at the right fix.
The numbers behind every service call
Founded to raise the standard in the trades — 30+ years of combined service experience, around-the-clock dispatch, and a perfect review score earned one honest visit at a time.
Straight answers, running procedure
The questions homeowners actually ask, the repair-or-replace math done honestly, and the fixed path every service call follows.
Run the honest math.
The same 50% rule our techs use at your door — try it before you spend a dime.
Step 1 — What's the equipment?
The honest verdict
Fix it.
A $600 repair on a 8-year-old tank water heater is money well spent — you should have years left in it.
Rule-of-thumb math only (38% of remaining value) — a real diagnosis beats any calculator. Ours comes with a straight answer, either way.
This month's specials
The straight-shooter guarantee
Raising the standard in the trades isn't a slogan — it's why the company exists. Three promises, every visit.
Honest diagnosis
Honest recommendations, every time. If a repair will genuinely hold, we won't sell you a replacement — and when replacement is the smarter investment, we'll show you the evidence and explain why.
Estimate before work
True Transparency Pricing before a single fitting is touched. You see and approve the number first — no mystery line items, no pressure, no hard feelings.
Made right
Our work carries a 100% satisfaction guarantee, and the equipment we install carries its manufacturer warranty. If something's not right after a visit, call — we'll make it right.
What neighbors say after the visit
RX-01 July 2026
“Arman came on the same day and took a thorough check at the problem of the old water heater. He explained what the problem was. We decided to replace it. He and his coworker did a great job placing sheets in the hallway and made sure draining the old water heater would not cause any problem on our wood floor. They replaced the water heater and cleaned up the area — very efficient and neat. The whole team, from back office to the technicians, is very friendly and helpful.”
RX-02 July 2026
“My mom is very happy with Pierre's service and honesty. He had to perform some work on the gas line as it was rusted and needed to be replaced. Pierre was quick in his response, which is important especially with an older person. His pricing is very fair. She highly recommends Pierre and the team.”
RX-03 December 2025
“We had a sewage emergency at our commercial office building and they showed up in less than 2 hours after I made the call. Pierre, the owner, came out personally. He was super friendly, honest, and easy to work with — he explained everything in a way that made sense and gave me clear, upfront pricing before each step.”
RX-04 January 2026
“The owners, who also are the plumbers, are amazing, talented, knowledgeable, and courteous. They helped me with correcting a very old plumbing issue at a commercial property of mine. They came out on short notice about a month ago. I haven't had a problem since, and my tenants are very happy.”
RX-05 April 2026
“We wanted to swap out our 29-gallon water heater for a 40-gallon. When I messaged Pierre on a Sunday, he had someone out first thing Monday morning. Refugio was friendly, professional and efficient! After the new water heater was installed, he gave me a quick rundown of the new unit, hauled away the old one, and probably left our home cleaner than when he arrived.”
Us vs. the other guys
When something breaks you have options. Here's what actually shows up at your door.
| Feature | All Systems Pros | Big-box service desk | App handyman | Franchise chain |
|---|---|---|---|---|
| Licensed, bonded & insured plumbers | Yes | Varies Varies | No | Yes |
| Rheem / A. O. Smith / Raypak certified | Yes | No | No | Varies Varies |
| Real 24/7 emergency dispatch | Yes | No | No | Varies Varies |
| Talks you out of unneeded repairs | Yes | No | Varies Varies | No |
| Price approved before work starts | Yes | Varies Varies | Varies Varies | Yes |
| Owner-operated, local crew | Yes | No | Varies Varies | No |
Another expensive quote?
Get a second look — free.
Free estimates on system replacements and upgrades. If the other quote is fair, we'll say so. If it's not, you just saved real money with one phone call.
Dispatch radius
Rolling out from 246 W Chestnut Ave, Monrovia, CA — fast local response across Pasadena and the San Gabriel Valley, 24 hours a day.
All Service Areas
Questions we get every week
The stuff homeowners actually ask before they call — answered the same way we'd answer at your kitchen table.
All FAQsQ01 Are you really available 24/7?
All Systems Pros offers plumbing service 24 hours a day, seven days a week. Call 800-754-5076 to describe the issue and confirm availability. For a suspected gas leak, leave immediately and call SoCalGas from a safe location; do not wait for a plumber.
Q02 Do you offer free estimates?
Free estimates apply to installations and replacements. Confirm any diagnostic or service-call charges when booking. Review the written scope and price before authorizing repair or installation, including the process for approving additional work if conditions change.
Q03 What areas do you serve?
We're based in Monrovia and serve the San Gabriel Valley and surrounding communities — including Pasadena, Arcadia, Altadena, Glendale, Burbank, South Pasadena, San Marino, Sierra Madre, Temple City, and beyond. If you're nearby but don't see your city listed, give us a call — we can usually help.
Q04 What plumbing services do you provide?
Full-service plumbing for homes and businesses: water heater repair and installation (tank and tankless), drain cleaning and hydro jetting, sewer line camera inspection, repair, and trenchless replacement, gas line work, leak detection, pipe repair and repiping, sump pumps, garbage disposals, fixtures, and 24/7 emergency response. Commercial services include grease trap cleaning and restaurant drain programs.
Q05 Are you licensed and insured?
All Systems Pros is licensed, bonded, and insured, with CSLB Lic. #1097354 listed in its business information. The company lists Rheem ProPartner, A. O. Smith Certified Contractor, and Raypak credentials. Equipment warranty coverage depends on the manufacturer's written terms.
Q06 Do you offer financing?
Synchrony financing is available for qualifying installations, subject to credit approval and terms. Ask for the current options and compare interest, fees, payment requirements, and total cost before applying.
Q07 How is All Systems Pros different from other plumbing companies?
We were founded to raise the standard in the trades. That means transparent pricing with honest recommendations, skilled technicians trained to deliver quality workmanship, clear communication from the first call to job completion, and long-term solutions instead of temporary fixes. We'd rather tell you the honest answer than sell you the expensive one — our reviews back that up.
Know before you call.
Plain-English guides from the techs — what things cost, when to worry, and when to save your money.
Plumbing problem? Make the call.
Water heaters, drains, sewer, and gas lines across Pasadena, Monrovia, Arcadia, Altadena, Glendale, Burbank and the San Gabriel Valley — 24/7.
Direct line — tap to call 800-754-5076