Dennehy's Backflow Service

Irrigation/Sprinkling Systems · Maple Valley, WA · License #DENNEBS879LR

Registration expired per WA L&I as of May 9, 2026.

What do these mean?

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.

Source:License facts on this pageVerify at WA L&I

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.

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Bond & 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

NameStart date
Sean Patrick DennehyJun 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.

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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.