Marin Municipal Water District (Marin Water)
Southern and central Marin County
Population reference
186,895 people (EPA SDWIS active CWS PWS CA2110002)
Billing detail
Partial public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Most customers are billed every other month, six times per year. Some high-volume commercial accounts may be billed monthly.
- Rate structure
- 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.
- 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 reading
- 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.
- New-account deposit
- New service may be subject to a new-account service charge or security deposit; the reviewed start-service page did not publish a universal residential dollar amount or credit-check waiver. Applicants should complete the district start-service form and confirm the account-specific requirement with Customer Service.
Context, not a score
How documentation coverage compares
This profile
71%
overview fields with research notes
California
67%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Partial public detail found
5 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
71%
Details not confirmed in the reviewed public material
- Residential cost reference
- Activation or transfer fee
“Not confirmed” means the directory did not identify a dependable public statement. It does not mean the provider has no policy or option.
Primary verification routes
- Marin Municipal Water District (Marin Water) public website ↗
Provider-controlled destination used to confirm current customer instructions.
- EPA SDWIS / ECHO lookup (CA2110002) ↗
Search the federal drinking-water database using public water system ID CA2110002.