Best Licensed Plumbers in Monrovia, CA
26 plumbing companies registered in Monrovia hold current CSLB licenses, verified against official records as of August 17, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
- 4,272 active C-36 plumbing licenses in Los Angeles County; 26 registered in Monrovia
- 12 of Monrovia's 26 licenses (46.2%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Monrovia: 12 years
- Longest Monrovia licensure: since 1969
- 375 county licenses reach their expiration date within 90 days
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- Verified
- August 17, 2026
- Licensed since
- 1969
- Phone
- (626) 357-5315
- Verified
- August 17, 2026
- Licensed since
- 1989
- Phone
- (626) 461-1700
- Verified
- August 17, 2026
- Licensed since
- 1990
- Phone
- (626) 359-3429
- Verified
- August 17, 2026
- Licensed since
- 1991
- Phone
- (626) 222-7954
- Verified
- August 17, 2026
- Licensed since
- 1995
- Phone
- (626) 524-3904
- Verified
- August 17, 2026
- Licensed since
- 1997
- Phone
- (626) 354-1082
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (619) 817-1944
- Verified
- August 17, 2026
- Licensed since
- 2008
- Phone
- (626) 358-1490
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Air Tro Incorporated | #258228 | On file | 1969 |
| R J Collins Plumbing Co Inc. | #583305 | On file | 1989 |
| Johnssons Plumbing Service | #586319 | On file | 1990 |
| Century Sewer Services | #626528 | On file | 1991 |
| S H Plumbing Heating & Air Conditioning | #707018 | On file | 1995 |
| Mountain Aire Services | #742211 | On file | 1997 |
Los Angeles County plumbing licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 4,272 active C-36 plumbing licenses in Los Angeles County, 26 of them registered in Monrovia. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Monrovia license has been held 12 years, and the longest-standing one dates to 1969. 12 of Monrovia's 26 licenses (46.2%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 4,270 of the county's 4,272 licenses carry the same $25,000 bond California sets by statute. 375 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
Plumbers in Monrovia: common questions
How many licensed plumbers are there in Monrovia?
26 active C-36 plumbing licenses are registered in Monrovia, out of 4,272 across Los Angeles County. 26 Monrovia-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license plumbers?
Yes. California licenses contractors by classification, and C-36 is the CSLB classification that authorises this work. 26 active C-36 plumbing licenses are registered in Monrovia and 4,272 across Los Angeles County, the longest-standing issued in 1969. Only CLEAR, unexpired licenses appear here.
How do I check a plumber's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which 12 of Monrovia's 26 currently carry. 375 Los Angeles County licenses expire within 90 days.