Dennehy's Backflow Service
Irrigation/Sprinkling Systems · Maple Valley, WA · License #DENNEBS879LR
Expired since May 9, 2026
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
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License facts
Principals on record since 2013.
- 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 — verified Aug 13, 2026. Applies to every row above.
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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.
Browse the directory
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Built from Washington State L&I public records, updated Aug 13, 2026. No star ratings or reviews — verification only.