Adagio Backflow Testing
Backflow Specialty · Bellingham, WA · License #ADAGIBT759RA
Active
State-verifiedWhat does verified mean?
- State-verified — Checked against WA L&I records, updated daily.
- Owner-verified — The business claimed this listing and verified ownership — free. Claim this listing
- Proven on Subser — The business runs real jobs through Subser — measured performance, not reviews.
License facts
Current filings: $1,000,000 liability coverage through Dec 18, 2026. Principals on record since 2025.
- License type
- PLUMBING CONTRACTOR
- Effective date
- Dec 18, 2025
- Expiration date
- Dec 18, 2027
- UBI
- 602587050
- Business type
- Limited Liability Company
- Phone
- (360) 223-2216
- Location
- Bellingham, WA 98225
Source: WA L&I contractor registration — verified Aug 13, 2026. Applies to every row above.
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Claim this free listingBond & insurance on file
| Insurance company | Amount | Agency | Effective | Expiration |
|---|---|---|---|---|
| State National Ins Co Inc | $1,000,000 | — | Dec 18, 2025 | Dec 18, 2026 |
What the bond and insurance requirements mean for homeowners
To register as a specialty contractor in Washington, a business must file a $15,000 surety bond with the Department of Labor & Industries; general contractors file $30,000.
The bond is a limited fund a homeowner (or subcontractor or supplier) can make a claim against, through the courts, if a registered contractor fails to meet its obligations on a job. Contractors must also keep general liability insurance on file — at least $50,000 in property damage and $200,000 in public liability coverage, or a $250,000 combined single limit — which covers damage the contractor causes, not workmanship disputes. The rows above are the bond and insurance filings L&I publishes for this registration; whether a specific filing applies to a specific project depends on its dates and terms.
Principals
| Name | Start date |
|---|---|
| Dianna Lien Del Giorgio | Nov 24, 2025 |
| Luke Samual Del Giorgio | Dec 10, 2025 |
What is a Backflow Specialty contractor licensed to do in Washington?
Backflow specialty contractors install, repair, and test backflow prevention assemblies — the devices that keep irrigation and other systems from siphoning contaminants into drinking water lines. Typical work includes installing assemblies on irrigation and fire lines and annual testing and repair. As a condition of registration, contractors in this category file a $15,000 surety bond and proof of general liability insurance with WA L&I.
Browse the directory
Built from Washington State L&I public records, updated Aug 13, 2026. No star ratings or reviews — verification only.