Current Reservoir Levels and Recorded Rainfall Data
About 75% of the District’s water supply originates from rainfall on our Mt. Tamalpais watershed and in the grassy hills of west Marin, flowing into the District’s seven reservoirs. The District also supplements its supply with water from the Sonoma County Water Agency (SCWA), which comes from the Russian River system in Sonoma County. The Russian River water supply originates from rainfall that flows into Lake Sonoma and Lake Mendocino. Learn more about our water supply, reservoir levels, and recent rainfall in the tables below.
Please note: Data on this page is typically updated M-F, with the exception of District-observed holidays. Data may occasionally be delayed in posting.
Supply Status Summer 2026 Update – Reservoir levels remain strong
Marin Water’s seven reservoirs were above 91% capacity as of July 1, 2026, continuing a trend of better-than-average storage levels. Conservation and operational strategies put in place to bolster the District’s water supply resiliency following the 2021 local water shortage emergency have kept reservoir levels strong. Despite current healthy reservoir supplies, Marin Water recognizes that drought will continue to be a regular occurrence in California and so our work to implement our Water Supply Roadmap remains ongoing. The Roadmap identifies potential projects that will improve and expand existing storage while also outlining opportunities to develop new supplies so that the District is better positioned to weather future periods of extended drought.
Water Production
| Week Ending | Average Million Gallons Per Day |
|---|---|
| 9/14/2026 | 24.53 |
| Same Week in 2025 | 23.74 |
| Supply Source: | |
| Reservoirs | 14.22 |
| Same Week in 2025 | 13.26 |
| Russian River | 10.31 |
| Same Week in 2025 | 10.48 |
Additional resource: Annual Customer Water Usage Data
Rainfall
| Rainfall at Lake Lagunitas (average annual rainfall is 52.65 inches) | Inches |
|---|---|
| 7/1/2026 – 9/14/2026 | 0.80 |
| Same period last year | 0.16 |
| Average year-to-date | 0.36 |
| Rainfall for last 24 hours | 0.00 |
Summary: Current rainfall (0.80) is 222.22% of the average rainfall 0.36 for this date.
Daily Rainfall & Reservoir Data – Current Fiscal Year to Date and Historical
- Rainfall History Chart
- Rainfall & Reservoir Data Current Fiscal Year
- Rainfall & Reservoir Data 2025-26 Fiscal Year
- Rainfall & Reservoir Data 2024-25 Fiscal Year
- Rainfall & Reservoir Data 2023-24 Fiscal Year
- Rainfall & Reservoir Data 2022-23 Fiscal Year
- Rainfall & Reservoir Data 2021-22 Fiscal Year
- Rainfall & Reservoir Data 2020-21 Fiscal Year
- Rainfall & Reservoir Data 2019-20 Fiscal Year
- Rainfall & Reservoir Data 2018-19 Fiscal Year
- Rainfall & Reservoir Data 2017-18 Fiscal Year
- Rainfall & Reservoir Data 2016-17 Fiscal Year
Reservoir Storage
| Alpine, Bon Tempe, Kent, Lagunitas, Nicasio, Phoenix & Soulajule Reservoirs (total capacity 79,566 acre-feet) | Acre-feet | % of Capacity |
|---|---|---|
| Storage as of 9/14/2026 | 66,007 | 82.96% |
| Storage for this date last year | 65,784 | 82.68% |
| Average storage for this date | 55,630 | 69.92% |
Summary: Current storage (66,007 AF) is 118.65% of the average storage (55,630 AF) for this date.
Reservoir Diversion Data
By Reservoir: