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Mostardi Platt Associates, Inc. was founded in 1976 by Tom Mostardi and Bob Platt in a small garage in Chicago, Illinois. As the world was becoming more environmentally conscious, these two recent engineering college graduates recognized the need for a consulting service to assist businesses in the assessment of environmental risks and compliance with the increasing number of ever-changing environmental regulations. 

Over the next twenty years, the company grew into a full-service environmental consulting firm with a list of services offered to clients throughout the United States and internationally. In 2001, the company’s air emissions testing and continuous emissions monitoring systems (CEMS) divisions were sold to the General Electric Company. The remaining consulting divisions began doing business as Mostardi Platt Environmental and continued to provide environmental assessment, permitting, and compliance management services. In 2004, Platt Environmental Services, Inc. was formed to again focus on air emissions testing and continuous emissions monitoring services. Platt Environmental Services, Inc. was acquired by Mostardi Platt Environmental’s holding company in 2005 and merged into Mostardi Platt Environmental in 2011 when it began doing business simply as Mostardi Platt, once again a full-service environmental consulting company.

In 2011, Mostardi Platt moved into a 53,000 square foot state-of-the-art facility in Elmhurst, Illinois.

The headquarters includes office space for its professional staff of engineers, scientists, and technicians, as well as a warehouse for its fleet of vehicles which are specially equipped to facilitate air emissions testing services throughout the United States and overseas. Mostardi Platt also maintains satellite offices in Chicago, Illinois; Crown Point, Indiana; Mendota Heights, Minnesota; Las Vegas, NV; and Denver, CO.  Today, Mostardi Platt is proud to use its expertise to assist a wide variety of businesses and industries in maintaining compliance with environmental regulations. Mostardi Platt truly appreciates and values its many clients and looks forward to continuing to provide them with exceptional service for many years to come.


The mission of Mostardi Platt is to create and provide highly professional and innovative environmental compliance management support services and processes through a superior interactive and cooperative employee work culture which we extend to our client relationships.

In placing the interests of our clients ahead of our own and focusing on superior service delivery, technical competence, and effective communication, we will develop the trust and confidence of our clients which will result in employee job satisfaction, company growth, and fair financial reward.


Our Employees

The strength and vitality of our company lies in our people. We are committed to providing them with the work environment, tools, training, and support to achieve excellence in client satisfaction as well as the motivation, recognition, and opportunities to realize their own career goals.


We are honest, ethical, and fair. We tell the truth and expect to hear the truth from others. We deliver on our commitments and on the expectations of clients and co-workers.


We work together to achieve our common goals. We believe in the dignity of the individual and that mutual respect, communication, openness, and flexibility are important to success.

Technical Excellence

We use our experience and the most advanced techniques and tools to meet and exceed the quality expectations of our clients and co-workers. We go beyond the client’s expectations.


We search for ideas to improve quality, save time, reduce costs, and improve communication for our clients and the company.


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