Public Water Authority
Marin Municipal Water District (Marin Water)
Serving Southern and central Marin County
Population served
186,895 people (EPA SDWIS active CWS PWS CA2110002)
State system code
FIPS 06
Billing frequency
Most customers are billed every other month, six times per year. Some high-volume commercial accounts may be billed monthly.
Provider briefing
How this utility’s billing works
Marin Municipal Water District (Marin Water) operates as a public water authority serving Southern and central Marin County. Customers should use the provider’s current account-specific bill and official customer-service instructions as the final authority for deadlines, balances, and service requests.
The published water-rate framework is described as Meter-size fixed charges plus progressive volumetric tiers. One unit equals 748 gallons or 100 cubic feet; customers use Tier 1 first and move into higher tiers as bi-monthly consumption increases. The adopted four-year schedule includes annual July 1 rate changes and allows drought surcharges if supply reaches critical levels.. Bills are generated most customers are billed every other month, six times per year. some high-volume commercial accounts may be billed monthly., and a typical residential cost reference is A dedicated this detail was not publicly posted. As a single exact 2026 figure because Marin Water’s bill depends on meter size, two-month consumption, capital-maintenance fee, watershed-management fee, customer region, and applicable discounts. The district provides a current-rate table and household bill estimator; divide a representative bi-monthly result by two for a monthly planning estimate.. These descriptions are useful planning benchmarks; actual charges can change with meter size, usage, sewer averaging, local taxes, drought stages, or account-specific fees.
Wastewater and sewer calculation
Marin Water is primarily a potable-water district and the reviewed customer billing materials describe water, watershed, and infrastructure charges rather than a district wastewater line item. Sewer charges, where applicable, are generally supplied by a separate local sanitation agency and must not be inferred from Marin Water’s water bill.
Meter and infrastructure notes
Most customers are billed on a two-month cycle. Marin Water has been testing advanced metering technology and planning a service-area rollout by 2030; the reviewed current pages do not establish that all residential meters transmit hourly AMI data, so the system should be treated as mixed/transitioning rather than universally smart-metered.
Emergency water support
Report a leak or water emergency
415-945-1500 for water emergencies such as a possible main break; customer billing support is 415-945-1400.
Official starting point
Choose the right next step
Reading this profile
A practical reference for Southern and central Marin County
Marin Municipal Water District (Marin Water) is listed here as a public water authority. The profile separates account actions—such as paying a bill or requesting service—from explanatory material about rates, meters, wastewater, leaks, and delinquency.
Because utility rules can vary by account class, meter size, service address, billing date, and local ordinance, treat the published bill and current provider website as the final authority. Use this profile to locate the correct channel and prepare better questions for customer service.
If your issue is urgent, start with the provider’s emergency number or official payment route rather than waiting for an email response. Keep a written record of calls, confirmation numbers, notice dates, and documents you submit.