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These agencies serve South El Monte from nearby bases in towns including Los Angeles, West Covina and Pasadena.
24 agencies listed · 8 open 24/7 · 15 open weekends · 21 rated 4.5+ · 7 show a license
Data verified October 17, 2026
The 24 agencies on this page are the private investigators listed for South El Monte, CA. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.
The 24 agencies on this page are rated from 4.2 to 5.0 across 330 reviews; 2 have 50 or more reviews and 21 are rated 4.5 or higher. 8 are open around the clock; 15 are open on Saturdays and 12 on Sundays. The services the agencies on this page list most often on their websites are background checks (3), missing persons (3), child custody (2), surveillance (2) and workplace investigations (2). 7 show a license on their websites and 6 have a BBB rating of A or A+. Domain records put 13 websites of the agencies on this page at ten or more years old; the oldest dates from 1995. 8 offer urgent consultations and 5 offer a free initial consultation. 1 has Spanish-speaking staff. We have a website on file for 23 of the agencies on this page; 16 publish a contact page; 11 list a public email and 1 takes bookings online. We count these figures across the agencies on this page; hours and prices change, so confirm the details with the agency before you book.
5 of the 24 agencies state that a first consultation costs nothing. Use it to describe the problem and hear whether the work can be done lawfully at all. A straight agency will sometimes tell you on that call that what you want cannot be obtained, which saves you a retainer.
