About Us
A Disciplined Standard for Puget Sound Security
Diligence Security exists to be the accountable, professional alternative to the region's revolving-door security firms — a Team that protects people, not just property.
Who We Are
Diligence Security is a Washington State licensed Security Company headquartered in Puyallup, with a strong presence in Seattle and Officers deployed across Pierce, King, Snohomish, Kitsap, and Thurston Counties. We protect commercial, industrial, residential, and event Clients across the greater Puget Sound.
Our Mission
Lead. Serve. Protect. We redefine the security services industry by operating to the highest ethical and environmental standards while protecting our Clients, our Employees, and our Communities with pride and professionalism.
Our Core Values
Every Officer is hired, trained, and evaluated against four values that define who we are.
Adaptive
Our Officers meet each site, each shift, and each situation on its own terms — reading the environment and adjusting instead of applying a template.
Ethical
We hold Officers to a professional and moral standard higher than the state minimum. Discretion, honesty, and fairness are non-negotiable.
Dependable
When the alarm trips, the sprinkler system goes offline, or your regular Officer calls out, our Team shows up. That reliability is our reputation.
Diligent
Every Patrol, Security, and Fire Watch Log is complete, timestamped, and shared digitally. Detailed documentation is how we prove coverage and reduce liability.
Our Approach
Diligence Security invests in training as our product. Every Officer completes the Officer Integration Program (OIP), a multi-day curriculum that goes well beyond the Washington State minimum. OIP 1 establishes Washington licensing law, the Task Priority Continuum, use-of-force limits, de-escalation, emergency response, medical training, Fire Watch Officer certification, and professional report writing. OIP 2 develops advanced communication, behavioral profiling, and crisis intervention for Officers who complete probation.
Every site receives an agreed Site Instructions document and digital Patrol, Security, and Fire Watch Logs the Client can view in real time. You get proof of coverage, not promises.
What We Do
Our services span Mobile Patrol Officers, On-site Security Officers, 24/7 Emergency Response, Certified Emergency Fire Watch, and Event Security across Five counties.
Based in Puyallup, Built on a Standard
Diligence Security is headquartered at 205 15th Ave SW in Puyallup. Our Officers work primarily in Pierce County, followed by King County, with coverage across five Western Washington counties. Our story shows in the work itself: unarmed Officers, clear assignments, professional communication, and records that show Clients exactly what happened on their property. Our case studies — a multi-site healthcare network, an apartment community under an arson threat, and recurring live music events — show that standard applied to very different problems.
A sharp uniform is only one part of a useful security program. An Officer also needs to know the limits of the assignment, the property's access rules, and when to call for help. Our training ties directly to those daily decisions, with verbal de-escalation, observation, and accurate reporting at the center, so Officers resolve problems with measured action instead of confrontation.
Licensing, Accreditation, and Insurance
Diligence Security LLC holds Washington DOL Business License #1234 under UBI 604-607-869 and is BBB Accredited in Puyallup. Those identifiers give your procurement Team specific records to verify during vendor review. If your process requires certificates of insurance, send the requirements through our contact page and our Team will provide the documentation.
Training for Our Team and Yours
Other Washington security companies send their Officers to our training. OIP 1 is $75 per Officer and OIP 2 is $300 including OIP 1; both are always being scheduled, generally every three to four weeks. OIP 3 is available on request and quoted per Team. Our training overview explains each level and links to the official Washington licensing requirements, and applicants can explore Careers for the employment path.
Explore More
Read our Officer Training (OIP), our Frequently Asked Questions, explore Careers, or Get in Touch.
Protect your people with a Team you can trust and verify.
Request a professional site evaluation or immediate emergency deployment. Local Supervisors respond fast across the Puget Sound.