The details on A1 Radon Mitigation LLC
- WA L&I registration
- A1RADRM744K2
- Registration checked
- September 7, 2026
- Registered since
- 2026
- Expires
- May 2028
- Contractor bond
- $30,000 · Nationwide Mutual Ins Co
- Liability insurance
- $300,000 · State National Ins Co Inc
- Insurance through
- May 2027
- Primary trade
- General Contractor
- L&I specialty
- GENERAL
- Registered principal
- CASILLA, ARNOLD · since 2026
- Service area
- Spokane
Something here wrong or out of date? The business can claim this listing and correct it.
Questions worth asking A1 Radon Mitigation LLC
Is A1 Radon Mitigation LLC a registered contractor?
The number you want is A1RADRM744K2 — A1 Radon Mitigation LLC's Washington State L&I contractor registration, expiring May 2028. Last checked September 7, 2026. Washington's contractor lookup is free and open if you want to confirm it today. The same record shows a $30,000 contractor bond (Nationwide Mutual Ins Co) and $300,000 of liability insurance with State National Ins Co Inc through May 2027. Ask them to send the bond and insurance certificates over before the first day on site.
Where does A1 Radon Mitigation LLC work?
They list Spokane. Confirm your address is inside that when you ring — coverage moves around, especially in winter.
How does a business get listed on this site?
Licensed, and working in Spokane. That is the bar for a page on this site, and A1 Radon Mitigation LLC clears it. The registration gets checked against the state's record and the date sits on this page, so you can judge how current it is.