Security Guard Services Across San Diego County
MT Security & Investigations is based in Spring Valley and serves every community across greater San Diego County. Whether you're in South Bay, East County, North County, or Downtown — we deliver the same professional armed guards, HOA patrol, private investigation, and asset protection you'd expect from the county's most experienced security team.
City-Specific Service Pages
Find Security Services Near You
Click your city for a dedicated page about the services we offer in your area, local response times, and answers to common questions.
Spring Valley
Our hometown base. Fastest response times. Armed guards, HOA patrol, PI services. East County's local security company.
View Spring Valley →Chula Vista
South Bay's fastest-growing city. HOA patrol, armed guards, commercial security, and PI services throughout Chula Vista and Otay Ranch.
View Chula Vista →El Cajon
East County commercial hub. Retail security, warehouse patrol, workers' comp investigation, and construction site protection in El Cajon.
View El Cajon →National City
South Bay security for auto dealerships, commercial corridors, and residential communities. Armed guards and PI services in National City.
View National City →Santee
Suburban East County security for HOA communities, commercial properties, and warehouses in Santee and surrounding communities.
View Santee →Escondido
North County inland coverage for agricultural properties, wineries, medical offices, and commercial businesses in Escondido.
View Escondido →Lemon Grove
Lemon Grove neighbors. Minutes from our Spring Valley HQ — our fastest East County response. HOA patrol, guards, and PI services.
View Lemon Grove →Also Serving
Additional San Diego County Communities We Serve
MT Security & Investigations provides service countywide. If your city isn't listed above, call us — we almost certainly cover it.
Don't see your city? Call (619) 765-2222 — we serve all of San Diego County.
Get a Free Quote for Your Area →Protect Your San Diego Property — Get a Free Assessment
We respond within 2 hours. No obligation. No sales pressure. Just honest guidance from a retired law enforcement officer who understands your security needs.