Adagio Backflow Testing
Plumbing · Bellingham, WA · License #ADAGIBT759RA
Adagio Backflow Testing is one of 41 Plumbing contractors registered in Bellingham, registered with WA L&I since 2025. Current filings: $1,000,000 liability coverage through Dec 18, 2026. Principals on record since 2025.
How confident can you be in Adagio Backflow Testing?
Are they licensed, bonded, and insured?
Active license and $1,000,000 liability on file — checked against WA L&I records, updated daily.
Are they who they say they are?
Not yet verified — Adagio Backflow Testing hasn't claimed this listing. Own this business? Claim it free.
Do other pros stand behind them?
No endorsements yet from other licensed contractors in Bellingham.
Do they have jobs on record?
Not yet measured — Adagio Backflow Testing hasn't run jobs through Subser. Performance data comes from real jobs, not reviews.
Subser doesn't do star ratings or reviews — just verified records. What do these mean?
License facts
- 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 — checked Sep 27, 2026. Applies to every row above.
Registration is current through Dec 2027.
Is this your business? Claim it free to verify ownership — takes about two minutes.
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
Licensing in Washington requires a surety bond and general liability insurance filed with the Department of Labor & Industries, in an amount set by the license type.
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 Plumbing contractor licensed to do in Washington?
A plumbing contractor in Washington holds a plumbing contractor license issued by the Department of Labor & Industries, a separate program from construction contractor registration. Typical work includes water supply and drain, waste and vent piping, fixture installation, water heaters, and repiping. Individual plumbers are additionally certified through the state's plumber certification program; the license shown here is the business-level license. 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. Washington currently lists 41 Plumbing contractors registered in Bellingham.
Looking for reviews of Adagio Backflow Testing?
Subser doesn't have reviews or star ratings. This page shows Adagio Backflow Testing's WA L&I record — registration status, bond and liability coverage, and principals on file — plus any endorsements from other licensed contractors.
Own Adagio Backflow Testing? Claim the listing free. Worked with Adagio Backflow Testing? Endorse them from your own listing.
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Built from Washington State L&I public records, updated Sep 27, 2026. Subser doesn't do star ratings or reviews — just verified records.