The best 10 Security Guard Companies near Hercules, California - with verified email and phone number owner contact info

Precision One Protective is a Subchapter S corporation offering security guard and patrol services (NAICS 561612) in Contra Costa County. Operating over two years with roughly six staff, it targets a high‑income market—median household income $147,708, 59% above $100k. The firm faces 34 local competitors within a 21‑mile radius regional.

Diplomatic Security Specialists In Training offers BSIS‑certified mandatory and elective courses covering firearm laws, safety, the seven fundamentals of marksmanship, weapon maintenance, systematic patrol routines, liability issues, and courtroom demeanor. Instruction emphasizes real‑world application, strong‑hand and support‑hand drawing, and shooting from cover versus concealment for professional security personnel development today.

Ground Branch Security Group offers private security services in the San Francisco Bay Area, including armed guards, event protection, corporate and residential security, risk assessments, and crisis management. With over ten years’ industry experience, the firm emphasizes customized plans, 24‑hour response, and aims to expand nationally for businesses and individuals protection.

Quantum Protection Security provides professional security guard and patrol services across the Bay Area, including Vallejo, Crockett, Orinda, Pinole, El Sobrante, Rodeo, Stockton, San Francisco, Sacramento, and Oakland. Listed on Manta under SIC 7381, the company emphasizes reliability and commercial protection, though it currently has no public reviews available for clients seeking safety.

Springfield Consulting, a veteran‑owned firm with over 30 years in physical risk management, offers commercial security, event protection, and consulting services. Their portfolio includes armed and unarmed guards, mobile patrols, and specialty divisions such as bank security, cyber security, and crisis management. Clients note reliable response, professionalism, and veteran staff.

Overall and Associates Security Inc. provides private security solutions, including uniformed or plain‑clothed on‑site guards, mobile patrols, executive protection, event crowd control, and access‑control visitor management. The firm emphasizes licensed, vetted officers, customized plans, 24/7 support, rapid response, and a HALO body‑camera system for incident documentation. Technology enhances safety operations.

Forbes Security delivers professional security solutions with a focus on continuous officer training and detailed property assessments. Their management team emphasizes proactive strategies, fostering partnerships that prioritize client safety. The firm highlights a comprehensive approach, combining skilled personnel and tailored services to protect people, tenants, assets, and property value overall.

Core1 Security Services is a services company focused on security information and event management. With $5 M revenue and 51‑200 employees, it stresses professionalism and customer service. Technologies include WordPress, PHP, reCAPTCHA and Google Cloud DNS. Competitors are Protech Security and West Coast Security. Activity is low, suggesting limited market movement.

Grand Protective Security offers armed and unarmed guards, mobile patrols, CCTV monitoring, and risk‑management consulting across the Bay Area. Their team holds California licenses, undergoes extensive training, and uses advanced surveillance technology. Services span residential, commercial, industrial, healthcare, hospitality, construction, and event security, with 24/7 professional monitoring and free assessments.