About

Established in 1912, the Marin Municipal Water District provides high-quality drinking water to 187,500 customers in central and southern Marin County. Seventy-five percent of our water comes from more than 21,000 acres of protected watershed on Mt. Tamalpais and in the grassy hills of west Marin. Rainfall from these watersheds flows into one of MMWD’s seven reservoirs. This reservoir water is then treated at one of the district’s potable water treatment plants before traveling to customers’ homes and businesses.

Twenty-five percent of MMWD’s water is imported from the Sonoma County Water Agency (SCWA). SCWA water originates from rainfall that flows into Lake Sonoma and Lake Mendocino and is released into the Russian River. The Russian River water is filtered naturally through 80 feet of sand beds adjacent to the river. The Russian River water is blended with MMWD’s reservoir water in the distribution system.

Our Mission
To manage our natural resources in a sustainable manner and to provide our customers with reliable, high quality water at a reasonable price.

Municipal Water District Act
MMWD was formed by the California Legislature under the Municipal Water District Law of 1911 (State Water Code Section 71000). MMWD is a governmental agency authorized under Section 71000 of the California Water Code for the purpose of providing an adequate supply of water within its service area.

Public Records Act Requests
Public Records Act requests may be submitted to the Marin Municipal Water District online, by regular mail, by email, or by fax.
  1. Online: Public Records Act Request Form
  2. Mail: Marin Municipal Water District, Re: Public Records Act Request, 220 Nellen Avenue, Corte Madera, CA 94925
  3. Email: publicinformation@marinwater.org
  4. Fax: 415-927-4953

Please allow up to ten calendar days to receive a response to your request. Fees may apply.

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MMWD Fact Sheet Print Friendly Version
Service Area
 
Square miles
147
Population 187,500
Finance  
Budget fiscal year revenues (not including fire flow)
$71,119,800
Budget fiscal year disbursements (not including fire flow)
 
     Operations $69,466,761
     Debt service
$6,836,512
     Capital purchase and projects
$19,880,749
Total budgeted fiscal year disbursements
$96,184,022
Utility plant - net book value
(per audited financial statement as of 6/30/14)
$358,319,959
Water Supply
 
Watershed Lands (acres)
21,600
Number of storage reservoirs
7
Total reservoir storage capacity in acre-feet (1)
79,566
     In millions of gallons
29,927
Average yearly rainfall in inches at Lake Lagunitas
52
Average yearly runoff, less losses (2), in acre-feet
61,400
     In millions of gallons
20,000
Water imported from the Russian River (avg. annual, acre-feet)
7,000
Operational yield (3) (acre-feet)
28,500
Water Production
 
Service connections (active)
61,675
     Residential
55,402
     Other
6,273
Maximum annual use (1987) in acre-feet
33,100
     In millions of gallons
10,785
Average annual use from fiscal year 2004-2014 in acre-feet
27,560
     In millions of gallons
8,980
Water Facilities
Potable Recycled
Miles of pipeline
887 24
Number of storage tanks
125 3
Total tank storage capacity (in millions of gallons)
82 1.9
Number of pump stations
95 5
Number of water treatment plants
3 1
Maximum daily treatment plant capacity (in millions of gallons)
59 2
Average daily treatment plant production (in millions of gallons)
25 1
Watershed Facilities
 
Miles of watershed roads
92
Miles of watershed trails
59
Number of picnic grounds
8
Acres of wildfire protection fuel breaks
1,077
(1) One acre-foot is equivalent to 325,851 gallons, enough water to cover one acre (about the size of a football field) to a depth of one foot or to supply three families for one year
(2) Due to evaporation
(3) Amount of water that can be supplied in all but the driest years