Water Rates

Please note: New conservation regulations are now in effect. Learn more on our Drought Information page. Thank you for doing your part!

Marin Municipal Water District's water rates include both a fixed service charge and a per-unit charge, reflecting both fixed costs and costs based on the amount of water used. The service charge is based on meter size and covers the cost of billing, customer service, meter replacement and repair, meter reading, water conservation, and a portion of general administrative overhead. The per-unit charge includes the cost of water supply, treatment and distribution, and watershed maintenance.

The per-CCF* rate is based on consumption. It covers the cost of water transmission, treatment, distribution, watershed maintenance, importing water, and recycling water. The service charge is based on meter size and covers the cost of meter reading and billing, customer service, meter replacement and repair, water conservation, and administration.

How We Calculate Your Bill
A system of four billing tiers is used to charge for the units of water used.  A set number of units of water is allocated for each tier. Customers pay a higher per-unit rate for each additional unit if the water usage increases into the next higher tier. As such, the tier system is designed to encourage water conservation.

MMWD has a two-month billing cycle. Billed amounts are based on meter readings for water used during the previous two months. The billing periods are January/February, March/April, May/June, July/August, September/October, and November/December. To get an idea of when your meter will be read, see our billing area map. We begin the billing cycle in Area 1 and finish in Area 15.

If you have a question about your water bill, please call our Customer Service Department at 415-945-1400. For general water bill questions and payment options, see our customer FAQs.

Note: Single-family residential customers can be billed at the lower Tier 3 rate if they meet specific water conservation criteria and exemption requirements  

*One CCF is one hundred cubic feet or 748 gallons.
**CCFs per living unit.