Hydrostatic testing involves using water to pressurize oil and gas pipelines, sprinkler systems, plumbing and tanks, sewer systems, and similar structures to test for leaks and assess structural integrity. Jobs in hydrostatic testing include working as a pipefitter or inspector, but you can also become a technician or an operator. In these roles, your duties include calibrating and performing pressure tests, inspecting and repairing lines and systems, and assisting with routine maintenance. Additionally, these jobs have responsibilities related to safety compliance, reporting defective parts and equipment, and working from both written and oral instructions, so good communication skills and the ability to pay attention to detail are important.