We have updated our Privacy Policy. Our policy describes how we may collect, use, process and share your personal information. We use cookies which vary by type and jurisdiction. Visit the Your Privacy Choices link at the bottom of our website, which describes cookies we use and how to manage them.

Water Flow Design

San Jose Water will supply water flow design information for all projects within its service area. We produce this information using hydraulic modeling software. Individuals, contractors and insurance companies may use it to design irrigation and fire sprinkler systems. Local fire jurisdictions also use design information in determining if adequate fire protection is available from existing fire hydrants for new and remodel projects.

Obtain Water Flow Design Information

Email your request to: engineering.dept@sjwater.com. Please include the words WATER FLOW in the subject line and the information below (for ADU fire flow requests, please include ADU WATER FLOW in the subject line):

1. Requestor's name
2. Company name if applicable, mailing address, phone number, and email address
3. Street name and address of the project
4. Nearest cross street to that location
5. A sketch map of where the flow information is requested

Information Request Timing

Flow design information requests take 10-15 business days to process and we handle them in the order we receive them. We will notify you by email of our computer-simulated results. Upon your request, we can also mail you the results.

Previous Requests

If you are inquiring on the status of a previous request or unable to e-mail the information, call (408) 918-7362. Please leave your name, location of the request, and your phone number.

For flow information from existing fire hydrants requested by fire jurisdictions, please include any and all comments from the Fire Department.

Will Serve Letter Requests

For Will Serve Letter Requests, e-mail: engineering.dept@sjwater.com. Please include the word WILL SERVE LETTER in the subject line and provide:

  1. Property address for requested will serve letter
  2. Description of development planned for the property
  3. Requestor’s Name and state whether requestor is owner or consultant of property
  4. Plan check number from City (if available)

Will serve letter requests take 5 business days to process and we handle them in the order we receive them. We will e-mail you the requested will serve letter. Upon your request, we can also mail you the will serve letter.

Static Pressure Information

For information concerning Static Water Pressure contact:

Phone: (408) 918-7361
Fax:    (408) 279-7889
or e-mail: engineering.dept@sjwater.com. Please include the word STATIC in the subject line.

Map Information

For information concerning SJW’s underground utility maps contact:

Phone: (408) 918-7360
Fax:    (408) 279-7889
or e-mail: engineering.dept@sjwater.com. Please include the word MAP in the subject line.