Handicapped accessible water closets height is measured from the finished floor to the top of the __________________.

The height of handicapped accessible water closets is measured from the finished floor to the top of the seat. This measurement is crucial for compliance with accessibility standards, ensuring that individuals with disabilities can use the facilities comfortably and safely. Properly designed units promote ease of use, allowing those who may have mobility challenges to transfer onto the toilet seat without difficulty.

The other options, such as the rim, lid of the seat, or flush valves, do not represent the correct point of measurement for determining accessibility height, as they do not provide the most accurate assessment for user accessibility when seated. The focus on the seat specifically aligns with ergonomic and accessibility considerations laid out in plumbing codes.