Becoming a hydrotherapist depends on which type of hydrotherapy you want to practice, because the term covers several distinct careers with very different training paths. The three most common are aquatic therapy (using water-based exercises to rehabilitate patients), canine hydrotherapy (helping dogs recover from injuries or surgeries), and colon hydrotherapy (a specialized practice with its own credentialing). Each has different educational requirements, licensing rules, and career prospects.
Aquatic Therapy for Human Patients
If you want to use pool-based therapy to help people recover from injuries, manage chronic pain, or improve mobility, the most recognized path runs through physical therapy. In the United States, practicing physical therapy requires a Doctor of Physical Therapy (DPT) degree, which is a three-year graduate program following a bachelor’s degree. Physical therapists earned a median salary of $101,020 in 2024, and employment is projected to grow 11 percent from 2024 to 2034.
Within physical therapy, aquatic work is a specialization rather than a standalone career. After earning your DPT and passing your state licensing exam, you can pursue credentials specifically in aquatic rehabilitation. The Aquatic Therapy & Rehab Institute (ATRI), run through the Aquatic Exercise Association, offers a certification exam that requires 15 hours of education in aquatic therapy, rehabilitation, or aquatic therapeutic exercise. Those hours can come from hands-on workshops or online courses. This credential signals to employers and patients that you have focused training in water-based treatment techniques.
Occupational therapists and recreational therapists also practice aquatic therapy in certain settings. Cleveland Clinic’s pediatric aquatic therapy program, for example, uses recreational therapists trained in adaptive techniques to work one-on-one with children who have conditions like cerebral palsy, autism, spina bifida, and orthopedic disorders. The entry point for these roles is a degree in the relevant therapy discipline first, then specialized aquatic training on top of it.
One important note: physical therapy assistant (PTA) programs are not a stepping stone to becoming a full physical therapist. The curricula differ significantly, and fewer than 2 percent of enrolled DPT students were previously PTAs. If your goal is to lead aquatic therapy sessions independently, plan for the DPT route from the start.
Canine Hydrotherapy
Canine hydrotherapy is a growing field, but it operates in a very different regulatory environment. Unlike human therapists who must be licensed, canine body workers are largely unregulated in most states. This means there is no single mandatory credential, which makes it both easier to enter the field and harder for clients to distinguish qualified practitioners from undertrained ones.
The key distinction is between being “trained” and being “certified.” A trained canine hydrotherapist has been shown the basics by another practitioner, but that training carries no formal verification. A certified canine hydrotherapist has completed and passed a regulated course taught by instructors with the legal authority to certify practitioners. Several private organizations offer certification programs that cover canine anatomy, common orthopedic and neurological conditions, pool safety, and hands-on pool work with dogs.
Because the field is unregulated, your credibility depends heavily on the quality of your certification. Look for programs that include substantial practical hours, require an examination, and are recognized by veterinary professionals in your area. Many canine hydrotherapists build their careers by working closely with veterinary clinics that refer post-surgical or arthritic dogs for rehabilitation.
Colon Hydrotherapy
Colon hydrotherapy has its own distinct credentialing process that varies significantly by state. Some states require specific licensing, while others have minimal oversight.
In Washington State, for example, applicants must complete a training program administered by a licensed supervising naturopathic physician. The practicum requires performing at least 30 colon hydrotherapy procedures within six months, after which trainees must apply and pass a state examination within 90 days of completing the program. Practitioners already certified by organizations like the National Board for Colon Hydrotherapy (NBCHT), GPACT, or I-ACT are considered to have met the education and training requirements.
Florida takes a different approach, routing colon hydrotherapy through its massage therapy board. There, you must first hold a Florida massage therapist license, then complete an apprenticeship under a sponsor who has practiced colon hydrotherapy for at least three years. The apprenticeship takes place in a licensed massage establishment equipped with the proper equipment and teaching materials. After your sponsor reports your training as complete, you receive authorization to sit for the NBCHT examination.
Choosing Your Specialization
Aquatic therapists who work with human patients can focus on several populations. Pediatric aquatic therapy serves children with developmental and physical disabilities. Geriatric aquatic therapy helps older adults maintain mobility and manage arthritis or balance issues. Orthopedic aquatic therapy focuses on post-surgical recovery and sports injuries. Each of these niches typically requires additional continuing education beyond your base therapy credential, though no separate license is needed.
For canine hydrotherapists, common specializations include post-operative rehabilitation (particularly after cruciate ligament surgeries), weight management for obese dogs, and conditioning for working or sporting breeds. Building relationships with local veterinarians is essential regardless of your focus area, since most clients come through veterinary referrals.
Water Safety and Facility Knowledge
Regardless of which path you choose, you will need technical knowledge about maintaining a safe therapeutic water environment. The CDC guidelines for public pools require maintaining water pH between 7.0 and 7.8 and a minimum free chlorine level of 1 part per million, with testing at least twice daily and hourly during heavy use. Hot tubs, which are sometimes used in hydrotherapy settings, require higher disinfectant levels (minimum 3 ppm chlorine or 4 ppm bromine) and water temperatures that never exceed 104°F.
Hydrotherapy pools also require proper drain design to prevent entrapment injuries. If you plan to open your own facility rather than work within an established clinic, you will need to understand local health department regulations, pool safety codes, and insurance requirements. Many hydrotherapists start by working in an existing rehabilitation clinic or veterinary facility before eventually opening their own practice.
Steps to Get Started
- Human aquatic therapy: Earn a bachelor’s degree with prerequisites in anatomy, physiology, and biology. Complete a DPT program (three years). Pass your state physical therapy licensing exam. Pursue ATRI certification or equivalent aquatic therapy training.
- Canine hydrotherapy: Research certified programs in your area that include hands-on pool training with dogs. Complete certification through a recognized organization. Build referral relationships with veterinary clinics. Check your state’s specific regulations, as some states do require veterinary oversight.
- Colon hydrotherapy: Check your state’s requirements first, since they vary widely. Some states require a prior massage therapy license, others require naturopathic physician supervision during training, and some have no specific regulations. Complete the required training program and pass the applicable national or state board examination.
The timeline varies considerably. Becoming an aquatic physical therapist takes seven or more years of post-secondary education. Canine hydrotherapy certification programs can be completed in weeks to months depending on the program. Colon hydrotherapy training timelines depend on state requirements but typically involve several months of supervised practice.