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For over 50 years Post Alarm Systems has been fortunate to protect many of the finest businesses, residences, municipalities, churches, schools and homeowners associations throughout Southern California. Please contact us and we would be proud to give you the name and phone number of a client in your neighborhood or industry as they will be able to give you a first hand glimpse into our company. The following is a partial list of the commercial clientele we

Commercial / Industrial / Congregational

  • Walmart Stores
  • Burger King Restaurants
  • Crystal Cathedral
  • Food 4 Less
  • NAPA Auto Parts
  • Ralphs Supermarkets
  • Ricoh Electronics
  • Santa Anita Racetrack
  • Sunrise Ford, Fontana/North Hollywood
  • Tony Roma’s Restaurants
  • Trader Joe’s
  • Tournament of Roses
  • U-Haul
  • United Parcel Service
  • Xerox


  • City of Arcadia
  • City of Duarte
  • City of Downey
  • City of Huntington Beach
  • City of Long Beach
  • City of Mission Viejo
  • City of Pasadena
  • City of South Pasadena
  • City of Sierra Madre
  • City of West Hollywood
  • County of San Bernardino Facilities
  • Los Angeles Police Academy


  • Arcadia School District
  • Duarte School District
  • Fuller Theological Seminary
  • Los Alamitos School District
  • Oceanview School District
  • Pasadena Unified School District
  • Polytechnic School
  • San Marino School District

Homeowners Associations / Other Associations

  • California Breeders Association
  • Discovery Museum of Orange County
  • Downey Art Museum
  • Hollywood Dell Civic Association
  • Hollywood Land Homeowner’s Association
  • Jonathan Club
  • Los Feliz Estates Homeowner’s Association
  • Monterey Hills Federation
  • Outpost Estates Homeowner’s Association
  • Rio Hondo Country Club
  • Rose Court Community Association
  • Silverlake Resident’s Association
  • Tarzana Estates Homeowner’s Association