Blue Systems International
“We tried other PI firms and this private investigation firm has state of the art surveillance equipment and have the expertise to get the job done.”
Best Private Investigators in Santa Ana, CA
15 agencies listed · 5 in Santa Ana · 6 open 24/7 · 11 open weekends · 13 rated 4.5+
Data verified October 16, 2026
Lockjaw Legal Process Services
“Now I understand "LOCKJAW" they wont stop until the job is done.”
R.H. Young
“Young almost exclusively for the better part of the last decade because he is honest, ethical and highly effective.”
Threat Management and Protection
Gailey Associates
Quinn & Associates Confidential Investigations
“Frank was genuinely concerned for not only the well-being of our loved-one, but also with impact this situation had on our family, even when he was no longer “on the clock”!!”
The 15 agencies on this page are the private investigators listed for Santa Ana, 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.
Area overview: Santa Ana, CA
5 of the 15 agencies we list are based in Santa Ana; the other 10 serve Santa Ana from towns including Orange (6 mi), Tustin (4 mi) and Irvine (7 mi). 14 of the agencies on this page have a rating, from 4.3 to 5.0 across 505 reviews; 4 have 50 or more reviews and 13 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (92%), responsiveness (92%) and quality (88%). The topics that come up most in reviews of the agencies on this page are "communication", "expertise" and "price". 6 are open around the clock; 10 are open on Saturdays and 9 on Sundays. 7 show a license on their websites and 2 have a BBB rating of A or A+. Domain records put 11 websites of the agencies on this page at ten or more years old; the oldest dates from 1998. 6 offer urgent consultations; 8 offer a free initial consultation and 1 lists coupons or special offers. 1 has Spanish-speaking staff. We count these figures across the agencies on this page; distances are straight-line, and hours and prices change, so confirm the details with the agency before you book.
Which investigators listed for Santa Ana describe their work online?
All 15 agencies on this page have a website on file. Those pages are where an agency states its license, the kinds of investigation it takes on, and whether it works mainly for attorneys, for companies or for private clients. That last point changes how a report gets written.
Martin Investigative Services
“He found information I had been looking for for months in a few hours.”
Peterson Investigations
“If you need any type of security or criminal activity investigated, I will not look any further and would not call anyone else.”
Confidential Controls - Private Investigator
“He was attentive to our requests, and stayed connected throughout the surveillance.”
JPL Process Service
“Really appreciated the aftercare when the recipient of the documents tried to dispute the service, JPL continued to support and the court ultimately found that service had been completed properly.”
DBM Private Investigator
“Derrick was easy to work with and went above and beyond to help get me factual information in my case.”
Gomez Investigations Unit- Detective Privado
“They went above and beyond to answer all my questions and went over all the finding with me.”
Southern California Private Investigations
“I recommend Southern California Private Investigations Inc 100%”
Oeis Private Investigation
“Very informative and professional, they were also able to do my live scan after my class ..”
Discreet Services
Why these companies made our list
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