In the US there is a federal mandate limiting the flow rate of replacement shower heads to 2.5 Gallons Per Minute (GPM).
The table below shows the maximum flow rate for a replacement showerhead that can be sold in various states and regions within the US..
Please note that plumbing codes may change, and we may not always have the latest regulations. For the most up-to-date information, please check with your local municipal offices.
| State | Current Max Flow Rate For Retail Sales of Replacement Shower Heads* |
| Scottsdales, Arizona | 2.0 GPM |
| California | 1.8 GPM |
| Colorado | 2.0 GPM |
| Ft. Collins, Colorado | 1.8 GPM |
| Miami-Dade County, Florida | 1.5 GPM |
| Hawaii | 1.8 GPM |
| Chicago, Illinois | 2.0 GPM |
| Maine | 2.0 GPM |
| Maryland | 2.0 GPM |
| Massachusetts | 2.0 GPM |
| New Jersey | 2.0 GPM |
| New York | 1.8 GPM |
| New Your City | 2.0 GPM |
| Nevada | 2.0 GPM |
| Oregon | 1.8 GPM |
| Rhode Island | 2.0 GPM |
| Vermont | 2.0 GPM |
| Washington | 1.8 GPM |
| Washington D.C. | 2.0 GPM |
| All other US States | 2.5 GPM |