Updated: Apr 20, 2026
Location and Projects
Address
305 E AVENUE, National City, CA, 91950
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Ashton Backflow Service Plumber
Ashton Backflow Service, 305 E Ave, National City, CA (Owned by: Patrick Thomas Ashton) holds a Plumbing license according to the California license board.
Their BuildZoom score of 92 ranks in the top 32% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Ashton Backflow Service, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Ashton Backflow Service Services
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Ashton Backflow Service Contact Information
Phone Number: (619) 339-7631
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Address: 305 E AVENUE, National City, CA 91950
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Building Permits by Ashton Backflow Service
This is a sample of this contractor's permits. Click here to access their complete permit history.
No Description Available
Valuation:
N/A
Permit #:
559417
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
E-23351 install backflow preventer iaw sdw-27
Valuation:
N/A
Permit #:
546647
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
Install back flow device**epermit**22304
Valuation:
N/A
Permit #:
634717
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
Install backflow*epermit*01157
Valuation:
N/A
Permit #:
428832
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
452737
Status:
issued
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
445641
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
471507
Status:
complete
Fee:
$480
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
471508
Status:
complete
Fee:
$480
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
471509
Status:
complete
Fee:
$480
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
471510
Status:
complete
Fee:
$480
Permit Type:
N/A
Building Type:
N/A
E-pmt 25461-install backflow
Valuation:
N/A
Permit #:
445290
Status:
complete
Fee:
$120
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Ashton Backflow Service License info
Verified License
| License # | 890414 |
| Status | Active |
| State | California |
| Type | Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Ashton Backflow Service at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
Bonded
| Bonded Agent | Developers Surety & Indemnity Company |
| Bond Value | $15,000 |
11
Permits
- Building permit records show that Ashton Backflow Service has worked on 11 permitted projects.
Ashton Backflow Service Employees
PA
Patrick Thomas Ashton
Owner