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Development Services

Get started here to install a new water service or modify an existing one

When initiating a construction project, there may be a variety of requirements related to water service that must be undertaken as part of your project. These requirements are established and administered by Marin Water. Projects may include:

  • New construction
  • Renovations requiring installation of a fire sprinkler system 
  • Renovations adding water fixtures beyond existing meter capacity
  • Accessory dwelling units (ADUs)
  • Dedicated irrigation meters
  • Relocating an existing water meter

Marin Water's Engineering Development Services team can assist you with information regarding the installation of new or upgraded water meters, dedicated fire line connections or water main extensions.

To get an early idea of potential requirements for your project, refer to the overview of new water service requirements.

When you are ready to proceed with the water service installation or modification process, complete the Project Information Form. 

Project Information Form

What to expect after submitting your Project Information Form

Your project information will be reviewed by Marin Water staff within 10-14 business days. Marin Water will then provide all requirements, fees and forms for your project. For a step-by-step guide to the water service application process, please refer to the Water Service Checklist.

Connection Fees

NOTICE: Marin Water's Board of Directors approved an update to the District's capacity charges (currently known as connection fees), which will become effective on all completed water service applications received by the District on or after July 1, 2025.
Learn more: 2025 Water Capacity Charge Study
Connection fees effective through June 30, 2025

Connection fees are one-time charges for new customers to connect to the District’s water system, and for existing customers who want to increase their existing allotment. The fee reflects the estimated reasonable cost of capacity used to meet the demand. Please see Schedule of Rates, Fees and Charges for current connection fee, effective through June 30, 2025.

The annual consumption for residential use is based on the area average of the neighborhood where the unit(s) are to be built. All other uses, such as business, industrial, agricultural, or institutional uses, are based on consumption estimates done by the District or on information provided by the applicant.

The amount of water purchased at the time of application, based on consumption estimates, becomes the water entitlement for the property. If we determine at a later date that actual consumption is exceeding the entitlement, additional connection fees will be assessed to increase the property's entitlement, or the consumption will have to be reduced to the level consistent with the existing entitlement.

All water purchases are subject to the fees in effect at the time of the purchase. It is very important that the information requested by, and submitted to, the District be as accurate as possible.

Additional Potential Costs to the Customer

In addition to the fees, a customer may incur other costs when installing a new water service or when increasing the size of an existing water meter:

  • Installation of a backflow prevention assembly: Costs associated with purchasing/installing required backflow prevention assembly.
  • Landscape plan review: Costs associated with hiring a landscape architect to prepare and submit materials to comply with the landscape plan review process.
  • Installation of high-efficiency water-using fixtures: Costs to ensure fixtures (i.e., toilets, urinals, dishwashers, etc.) meet water conservation standards.

For questions, please call our Engineering Development Services department between 8 a.m. to 4 p.m., Monday through Friday at 415.945.1530.

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