About Us


The Story of Plumb Line Physical Therapy


Heidi and Stacey are former employees of a local business called, Aquabilities.  Aquabilities offered swim school, aquatic fitness, massage, and physical therapy, both on land and in the water.  Both therapists LOVED Aquabilities and considered themselves “lifers”, hoping to work there until their retirement. 


In June of 2011, Aquabilities needed to permanently close its doors for business.  Upon learning of the upcoming closure of Aquabilities, Heidi and Stacey began to throw around the idea of opening their own facility.  They wanted to keep the values and practices that they loved, alive in a new location.  They decided to take the summer to investigate the prospect, the pieces kept falling into place, and Plumb Line’s doors opened on February 14, 2012.


Plumb Line Physical Therapy was born, with the tag line of “helping you find center”.  At the core, Heidi and Stacey want to be sure that the focus is on the best, quality care that could be given to each individual.  To achieve this, they made several commitments to themselves and the business.  At the forefront is one-on-one treatment.  Each session is spent between one therapist and one patient during their entire, scheduled session.  They believe this is very beneficial to the healing process.  It builds understanding of the individual as a whole, it insures proper alignment and technique during exercises, it allows time for hands-on techniques, and it fosters a better understanding of the tools needed to heal, giving the patient more control of the healing process.


Plumb Line continues to grow and welcome new patients, holding true to its values.  If you or your loved ones are in need of physical therapy, consider joining the Plumb Line family.


Meet the Family


Heidi Grubb, PT, DPT




Heidi Grubb is a graduate of Arcadia University with her Doctorate in Physical Therapy. As a 3-sport athlete in high school and college, she has a special interest in sports rehabilitation.  Dr. Grubb  is focused on staying informed regarding the latest research in the field of physical therapy and attends the Philadelphia Sports and Rehab foundation’s sponsored event yearly.  Other continuing education includes LSVT BIG certification, kinesiotaping, and aquatic therapy.  Dr. Grubb has been a member of the American Physical Therapy Association and Pennsylvania Physical Therapy Association since 2003.

Dr. Grubb, known as Heidi in the clinic, is passionate about providing individualized treatments which are directly supervised by the therapist. Heidi’s goal is to share the knowledge and tools she has gained with you, in order for you to work to manage your symptoms on your own.  The direct 1-on-1 session between you and your therapist helps improve technique with exercise and reduce unwanted irritation, allowing for quicker recovery.

When not in the clinic, Heidi enjoys spending time with her husband, Chris, and their 4 children, London, Everett, Declan, and Cavanaugh. Heidi and her family are rooted in the community and can be found attending local school plays, various fundraisers, carnivals, and sporting events.  


Stacey Brown, BA, PTA




Stacey received her Bachelor's degree in psychology from Eastern University and her Associate's degree as a physical therpaist assistant from Alvernia College.  Over the last 18 years, Stacey has diversified her scope of practice to include aquatic therapy, yoga, kinesiotaping, Back Education Training, and a wide variety of manual skills, including: Manual Lymph Drainage, Functional Orthopedics, Myofascial Release, and Cranial Integration. Stacey is also LSVT certified to work with individuals diagnosed with Parkinson's Disease (to find out more, check out our services tab).


Stacey believes in treating the person as a whole, to more effectively reach the goals established by the joint effort of the patient and the therapist.  Not only does she draw on the skills that she has learned and developed over the years but also her humor.  It is not uncommon to witness Stacey singing and if you're lucky, dancing in the gym.


On a personal note, Stacey enjoys hiking and traveling with friends (and her 2 Labs, Jingles and Figgy) and relaxes by using varied media to create art projects, including: stained glass, jewelry, pottery, and Zentangles. 


Sarah Arnholt, PT, MSPT

Physical Therapist



Sarah is a graduate of Ithaca College in New York with 17 years of experience in physical therapy.  Sarah boasts a strong background in manual therapies, ranging from Myofascial release to certification in the Graston technique.  Other specialties include pre/post natal and rehabilitation Pilates, Kinesiotaping, and Concussion rehabilitation.


Sarah loves working with people and displays a strong sense of empathy.  She focuses on finding the root cause of the problem and tailors her treatments accordingly.


A Boston native, she is a proud supporter of her home teams and is more than willing to provide lessons on how to "pak yaw ka in the garach." Sarah is very family oriented and loves spending time with her husband and 3 children.  She also volunteers her time in the classroom and on the soccer field.



Cindy Brown, LPN, LMT

Office Manager



Cindy's study and experience includes a wide variety of knowledge with a common thread of working with people.  Cindy has a license in nursing, has many years of experience in aquatics, and is a graduate of PA School of Muscle Therapy in King of Prussia, PA, earning her license in massage therapy.   During her 20 years as a massage therapist, Cindy has mastered a variety of techniques, including:  Swedish Massage, Therapeutic Massage, Watsu (in-water massage) Craniosacral Therapy, Myoskeletal Therapy, Mechanical Link and Myokinesthetic Technique.


In her spare time Cindy enjoys camping, gardening, and basket weaving.  Every fall, Cindy trecks up to northern PA with her sister to giggle a week away, while hiking in the woods, cooking over a fire, and sleeping in a Yurt.

MaryAnn Moran



MaryAnn joined the Plumb Line family in 2018.  As the former owner of Emergency Ambulance Billing Service in Western, PA from 1984-2016, she brings along the knowledge she acquired during her years of experience in the medical field.  MaryAnn loves interacting with people and is excited to welcome and assist new Plumb Line clients.


MaryAnn and her husband of 48 years, Bob, relocated to Douglassville to be closer to their daughter, son-in-law, and 2 grandchilren.  Both MaryAnn and Bob love staying busy with their new friends and family.   A favorite past-time activity is cruising to warmer climates.

Plumb Line Physical Therapy
955 Ben Franklin Hwy W

Suite 7
Douglassville, PA 19518

Phone: (610) 953-3232

Fax: (610) 953-3230

E-mail: plumblinept@aol.com

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