Best Radon Testing in Santa Ana, CA
Compare 15 local radon testing providers in Santa Ana. Verified listings with real contact info.
15 services listed
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JLM Environmental
12913 Harbor Blvd Ste Q-3 305, Garden Grove, CA 92840
Monday: 8:00 AM – 5:00 PM | Tuesday: 8:00 AM – 5:00 PM | Wednesday: 8:00 AM – 5:00 PM | Thursday: 8:00 AM – 5:00 PM | Friday: 8:00 AM – 5:00 PM | Saturday: 8:00 AM – 4:00 PM | Sunday: Closed
A-Tech Consulting, Inc.
1640 N Batavia St, Orange, CA 92867
Monday: 7:30 AM – 5:30 PM | Tuesday: 7:30 AM – 5:30 PM | Wednesday: 7:30 AM – 5:30 PM | Thursday: 7:30 AM – 5:30 PM | Friday: 7:30 AM – 5:30 PM | Saturday: Closed | Sunday: Closed
4.8 ★
38 reviews
IHS Environmental Inc
1601 Dove St #276, Newport Beach, CA 92660
Monday: Open 24 hours | Tuesday: Open 24 hours | Wednesday: Open 24 hours | Thursday: Open 24 hours | Friday: Open 24 hours | Saturday: Closed | Sunday: Closed
5 ★
12 reviews
Signature Home Inspection
74 Navarre, Irvine, CA 92612
Monday: Open 24 hours | Tuesday: Open 24 hours | Wednesday: Open 24 hours | Thursday: Open 24 hours | Friday: Open 24 hours | Saturday: Open 24 hours | Sunday: Open 24 hours
4.9 ★
415 reviews
Affordable Home Inspection Inc.
16787 Beach Blvd #342, Huntington Beach, CA 92647
Monday: 8:00 AM – 6:00 PM | Tuesday: 8:00 AM – 6:00 PM | Wednesday: 8:00 AM – 6:00 PM | Thursday: 8:00 AM – 6:00 PM | Friday: 8:00 AM – 6:00 PM | Saturday: 8:00 AM – 6:00 PM | Sunday: Closed
4.1 ★
23 reviews
Omega Environmental Services, Inc.
1133 Camelback St #7261, Newport Beach, CA 92658
Monday: 8:00 AM – 5:00 PM | Tuesday: 8:00 AM – 5:00 PM | Wednesday: 8:00 AM – 5:00 PM | Thursday: 8:00 AM – 5:00 PM | Friday: 8:00 AM – 5:00 PM | Saturday: Closed | Sunday: Closed
5 ★
2 reviews
Clark Seif Clark, Inc. (CSC)
4010 Watson Plaza Dr Suite 170, Lakewood, CA 90712
Monday: Open 24 hours | Tuesday: Open 24 hours | Wednesday: Open 24 hours | Thursday: Open 24 hours | Friday: Open 24 hours | Saturday: Open 24 hours | Sunday: Open 24 hours
5 ★
4 reviews
Elite Group Inspection Professionals
21700 Copley Dr #390, Diamond Bar, CA 91765
Monday: 5:00 AM – 7:00 PM | Tuesday: 5:00 AM – 7:00 PM | Wednesday: 5:00 AM – 7:00 PM | Thursday: 5:00 AM – 7:00 PM | Friday: 5:00 AM – 7:00 PM | Saturday: 6:00 AM – 5:00 PM | Sunday: 8:00 AM – 2:00 PM
4.8 ★
2282 reviews
Quest Property Inspections
3390 Garretson Ave, Corona, CA 92881
Monday: 8:00 AM – 5:00 PM | Tuesday: 8:00 AM – 5:00 PM | Wednesday: 8:00 AM – 5:00 PM | Thursday: 8:00 AM – 5:00 PM | Friday: 8:00 AM – 5:00 PM | Saturday: 8:00 AM – 5:00 PM | Sunday: Closed
5 ★
37 reviews
Coastal Property Inspections
30251 Golden Lantern STE-E # 361, Laguna Niguel, CA 92677
Monday: 8:00 AM – 6:00 PM | Tuesday: 8:00 AM – 6:00 PM | Wednesday: 8:00 AM – 6:00 PM | Thursday: 8:00 AM – 6:00 PM | Friday: 8:00 AM – 6:00 PM | Saturday: 8:00 AM – 6:00 PM | Sunday: 9:00 AM – 5:00 PM
5 ★
20 reviews
The Phase One Group
324 S Diamond Bar Blvd UNIT 130, Diamond Bar, CA 91765
Monday: 8:00 AM – 5:00 PM | Tuesday: 8:00 AM – 5:00 PM | Wednesday: 8:00 AM – 5:00 PM | Thursday: 8:00 AM – 5:00 PM | Friday: 8:00 AM – 5:00 PM | Saturday: Closed | Sunday: Closed
5 ★
18 reviews
Elite Group Inspection Professionals
9480 Utica Ave #608, Rancho Cucamonga, CA 91730
Monday: 8:00 AM – 7:00 PM | Tuesday: 8:00 AM – 7:00 PM | Wednesday: 8:00 AM – 7:00 PM | Thursday: 8:00 AM – 5:00 PM | Friday: 8:00 AM – 5:00 PM | Saturday: 8:00 AM – 5:00 PM | Sunday: 8:00 AM – 2:00 PM
5 ★
1515 reviews
Diamond Property Inspections
16721 Multiview Dr, Lake Mathews, CA 92570
Monday: 8:00 AM – 10:00 PM | Tuesday: 8:00 AM – 10:00 PM | Wednesday: 8:00 AM – 10:00 PM | Thursday: 8:00 AM – 10:00 PM | Friday: 8:00 AM – 10:00 PM | Saturday: 8:00 AM – 10:00 PM | Sunday: 8:00 AM – 10:00 PM
5 ★
117 reviews
Pillar To Post Home Inspectors - Mike Booth
9854 Cerise St, Rancho Cucamonga, CA 91730
Monday: 8:00 AM – 6:00 PM | Tuesday: 8:00 AM – 6:00 PM | Wednesday: 8:00 AM – 6:00 PM | Thursday: 8:00 AM – 6:00 PM | Friday: 8:00 AM – 6:00 PM | Saturday: 8:00 AM – 6:00 PM | Sunday: Closed
5 ★
151 reviews
Radon Mitigation Corp. of America
6207 Lochvale Dr, Rancho Palos Verdes, CA 90275
Frequently Asked Questions
How much does radon testing cost in California?
Professional radon testing typically costs $175 to $350. Short-term tests (48-96 hours) are used for real estate transactions. Long-term tests (90+ days) provide the most accurate annual average. **CDPH** recommends professional testing over DIY kits for real estate transactions, though DIY kits ($20-$40) are available at hardware stores.
Why is radon especially concerning in California?
California has varying radon levels depending on geology. **Granitic foothill counties and other radon-prone geologic zones** have elevated radon risk due to bedrock composition. Even other areas of the state have measurable radon. **CDPH** considers it a public health issue and publishes county-level radon data.
Are radon testers required to be certified in California?
California does not maintain a single statewide radon tester license like some trades. **CDPH** and professional organizations like the National Radon Proficiency Program (NRPP) or National Radon Safety Board (NRSB) recommend certified testers. For real estate transactions, use a certified professional to ensure legally defensible results.
What happens if my California home has high radon levels?
If radon levels exceed 4 pCi/L, the EPA and **CDPH** recommend installing a radon mitigation system. Sub-slab depressurization is the most effective method and typically costs $1,000 to $2,000. NRPP- or NRSB-certified mitigation contractors can perform installation. Mitigation reduces levels by up to 99%.
When should I test for radon in my California home?
**CDPH** recommends testing all homes, especially in high-risk areas. Test when buying or selling, after major renovations affecting the foundation, or if you have never tested. Testing during cooler months (November through March) with windows closed provides the most representative results. Re-test every 2 years or after major changes to the home.