Jul 12, 2024 | 07:00 PM

Emergency Water Main Repair
Jul 12, 2024 | 10:00 AM

Fire Hydrant Flow Test
What does it mean? Fire hydrant flow tests are conducted by DC Water at the applicant's request. The purpose of the test is to determine the hydraulic characteristics of the water distribution system at the location of their project site. This information is used by the engineer in designing the fire suppression system, calculating the size of the domestic and fire water services to the building and to size booster pump(s) if needed.
Does this apply to me?

If the project requires a domestic service connection of 3-inches in diameter or greater or has a fire demand in excess of 100 GPM, then a hydrant flow test is needed.

DC Water will require a current fire hydrant flow test be submitted with the permit application. Current means within one year of issuance of either DC Water's Water and Sewer Availability Certificate or DCRA's building permit. In accordance with NFPA code a current hydrant flow test is required to support the fire suppression system computations for the building.

Flow tests are not needed by DC Water for the design of single family houses where the fire protection flow rate is less than 100 GPM. A fire supply sufficiency letter can be obtained from DC Water for small fire services (100 GPM or less) which may satisfy DCRA requirements.

When do I apply? It is best to apply early - during the initial design process. A fire hydrant flow test must be obtained prior to engineering the building's domestic and fire water services for the building. The mechanical/electrical/plumbing engineer uses this information to complete the meter sizing worksheet and booster pump form.
What do I need to submit?

Please have the following information in your request package:

  1. A letter, on company letterhead, requesting a fire hydrant flow test. Please include an email address and/or fax number of the person(s) that you would like the results of the flow test sent.
  2. A check or money order made payable to DC Water in the amount of $320.
  3. A map identifying the location of the project site and which water main(s) you would like to make your connection (DC Water will determine the correct hydrants to flow for the test).
Where do I go and apply? Please mail or drop off the application to
Permit Operations Department
Attn: Fire Hydrant Flow Test Request
1385 Canal Street, SE
Washington, DC 20003
How long will it take?

30 days depending upon weather and emergency work load.

Please note that during winter months (when the average temperature is below 40 degrees Fahrenheit) hydrant flow tests are generally not performed due to potential risk of icing and will generally take more than 30 days to be processed.

What do I Receive? You will receive a report that includes the static and residual pressure of the main and the flow rate at each hydrant. Click here for a sample fire hydrant flow test report. The report will be emailed or faxed to the attention of the person on the request letter.
Related Activities: For larger projects (NFPA fire demand exceeds 100 GPM), the next activity following the hydrant flow test is typically submission of the preliminary site plan to DC Water for review and subsequent approval.
For more Info, call: Permit Operations Department at 202-646-8600
Regulatory Info DC Building Code and NFPA governing the fire suppression system design require a current hydrant flow test in additional to the requirement by DC Water.
Additional Information:

On occasion there are hydrant flow test that have been performed on the same hydrants that you are requesting (nearby projects that you see are under construction) that may be applicable for your project. If the flow data is current it can be used in lieu of a new hydrant flow test.

These results can be obtained by calling the Permit Operations Department at 202-646-8600. Please have the address of the adjacent site that you think may have the recent flow test results.

Upcoming Meeting

Board of Directors Meeting

April 24, 2023

Monday 9:00 AM


Placeholder DC Water Image
Rock Creek Parkway and Virginia Avenue, NW: Temporary Lane Closures

(Washington, DC) –DC Water’s contractor on the Potomac River Tunnel Project will begin performing utility investigations along portions of Rock Cre

Latest Blog Post
Graphic with three emoji faces: smile, neutral and frown. DC Water logo and Voice of the Customer graphic are also included.
Your Feedback Matters!
2024 Voice of the Customer Survey is open through August 11.
Upcoming Meeting
July 30, 2024
Tuesday, 2:00 PM