Dennehy's Backflow Service
Irrigation/Sprinkling Systems · Maple Valley, WA · License #DENNEBS879LR
Registration expired per WA L&I as of May 9, 2026.
Principals on record since 2013.
How confident can you be in Dennehy's Backflow Service?
Are they licensed, bonded, and insured?
Registration expired per WA L&I as of May 9, 2026.
Are they who they say they are?
Not yet verified — Dennehy's Backflow Service 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 Maple Valley.
Do they have jobs on record?
Not yet measured — Dennehy's Backflow Service 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
- CONSTRUCTION CONTRACTOR
- Effective date
- Jun 19, 2013
- Expiration date
- May 9, 2026
- UBI
- 603291339
- Business type
- Individual
- Phone
- (206) 919-9235
- Location
- Maple Valley, WA 98038
Source: WA L&I contractor registration — checked Sep 28, 2026. Applies to every row above.
Registration lapsed May 2026 per WA L&I records.
Is this your business? Claim it free to verify ownership — takes about two minutes.
Claim this free listingBond & insurance on file
What the bond and insurance requirements mean for homeowners
A $15,000 surety bond, filed with the Department of Labor & Industries, is a condition of registration for specialty contractors in Washington (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 |
|---|---|
| Sean Patrick Dennehy | Jun 19, 2013 |
What is a Irrigation/Sprinkling Systems contractor licensed to do in Washington?
Irrigation contractors design, install, and repair lawn and landscape sprinkler systems — supply lines, valves, heads, drip zones, and controllers. Seasonal work such as spring start-ups, winterization, and leak repair is a large share of the trade. Washington requires a $15,000 surety bond and general liability insurance for this registration.
Looking for reviews of Dennehy's Backflow Service?
Subser doesn't have reviews or star ratings. This page shows Dennehy's Backflow Service's WA L&I record — registration status, bond and liability coverage, and principals on file — plus any endorsements from other licensed contractors.
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Built from Washington State L&I public records, updated Sep 28, 2026. Subser doesn't do star ratings or reviews — just verified records.