Four decades of dignity, respect and empowerment

A 40-year legacy

of dignity, respect and empowerment

Our history

For 40 years, MHSA has strengthened the community through critical shelter, recovery and nutrition supports.

Our mission

Incredible things are possible when an entire community rallies around a single, powerful mission.

Our team

With the support of seasoned and mission-driven leaders, we are a diverse team, over 200-strong.


The mission begins


On October 19, 1977, a group of concerned professionals with links to the substance abuse world created the Middlesex Regional Alcoholism Treatment Center (MRATC).  With a small office in Watertown, Massachusetts and program facility in Waltham, the MRATC was a stand-alone alcohol detoxification program that provided various services including detoxification, Short Term Intensive Inpatient Treatment (STIIT) and Transitional Care for nearly two decades.  

Stationed on the grounds of the former Middlesex County Hospital, the MRATC was strategically positioned to cultivate relationships with an array of local service providers, including at least one that would later be acquired by the company after several years.


Our mission

The mission of Middlesex Human Service Agency, Inc. is to improve the quality of life and independent functioning of a wide variety of clients through the delivery of an extensive system of community-based substance abuse and social service programs.  Although our programs are many and varied, all emphasize dignity, respect and empowerment. We believe in teaching individuals and families the skills and problem solving abilities needed for self-sufficiency.

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Our Team

Rallied around MHSA's mission to help those in need, our team includes more than 200 dedicated and highly-trained clinicians, managers, administrators, direct care workers and professional staff.  


Beyond representing nearly a dozen spoken languages, our employees embody a diverse range of cultural, socioeconomic, educational and professional backgrounds.


MHSA team members undergo training on a spectrum of topics, such as cultural competency, nonviolent crisis intervention, trauma-informed care, overdose reversal, LGBTQ issues, motivational interviewing and more.

Middlesex Human Service Agency, Inc.

50 Prospect St., Suite 3

Waltham, MA 02453

Main Office hours

Monday - Friday | 8:00am - 4:30pm

Tel: 781-894-6110

Fax: 781-647-0412