Sonoma Water

What Sonoma Water does

Sonoma Water (legally Sonoma County Water Agency, doing business as Sonoma Water) is a public regional water agency founded in 1949 and headquartered in Santa Rosa, California, that supplies naturally filtered Russian River water to nine municipal contractors across Sonoma and Marin counties, serving over 600,000 residents. Distribution relies on 79 miles of underground aqueduct pipelines (16 to 54 inches in diameter), 18 steel storage tanks holding approximately 129 million gallons, seven booster stations, three groundwater wells, and the Mirabel and Wohler collector wells with 1,000–2,000 horsepower pumps and the Mirabel inflatable dam. Since 1995, the agency has also managed eight county sanitation zones serving roughly 22,000 residences and businesses, and it operates dual-purpose reservoirs (Lake Mendocino since 1959 at 118,000 acre-feet and Lake Sonoma since 1984 at 381,000 acre-feet), Warm Springs Dam, Spring Lake, Coyote Valley Dam, Matanzas Creek Reservoir, and over 80 miles of creeks under a stream maintenance program.

The agency's flagship technology is Forecast-Informed Reservoir Operations (FIRO), a flexible water management approach developed in cooperation with Scripps Institution of Oceanography's Center for Western Weather and Water Extremes, the U.S. Army Corps of Engineers, and NOAA. FIRO uses watershed monitoring and atmospheric-river forecasts to selectively retain or release water, enabling roughly 11,650 acre-feet of additional storage during flood control windows and producing approximately 130,000 acre-feet of cumulative water saved since 2014. The Advanced Quantitative Precipitation Information (AQPI) forecasting system extends this capability, and the biological monitoring program supports compliance with the Russian River Biological Opinion issued by the National Marine Fisheries Service.

Revenue is generated through two streams: wholesale water supply contracts with the nine municipal contractors and sanitation rates from the eight sanitation zones. Sonoma Water operates with a $256.2 million annual operating budget under State Water Resources Control Board Decision 1610 and four water rights permits (12947A, 12949, 12950, 16596). Pricing is established through multi-year service agreements with municipal contractors, with cost increases passed through to end consumers; one example is the 8.7 percent wholesale rate increase imposed on Rohnert Park in 2025. The agency is governed by an independent Board of Directors, employs between 101 and 250 staff, and has no outside equity investors.

Name

Sonoma Water

Legal name

Sonoma County Water Agency

Website

https://sonomawater.org

Company type

Private

Founded year

1949

Operating status

Operating

Headcount range

101–250 employees

Short description

Sonoma Water is a public regional water agency that supplies naturally filtered Russian River water and sanitation services to nine municipal contractors across Sonoma and Marin counties, serving over 600,000 residents through 79 miles of aqueduct infrastructure.

Ownership category

akta.pro rank

Product category

Water Utility Services

NAICS

Water Supply and Irrigation Systems (22131), Sewage Treatment Facilities (221320), Water, Sewage and Other Systems (2213)

SIC

Water Supply (4941)

akta.pro primary industry

Raw Water Conveyance & Transmission (Aqueducts, Mains, Pumping Stations) (EUANAAAB)

akta.pro secondary industries

Water Resources Administration (Watersheds, Rivers, Groundwater) (BPAIAMAE), Storage & Conveyance Structures (Reservoirs, Tanks, Culverts, Tunnels) (IMAFAGAE), Water & Wastewater Pipeline Construction (Mains, Force Mains, Interceptors) (IMAFAGAC)

Keywords

• Wholesale water supply
• Water resource management
• Wastewater treatment services
• Flood protection infrastructure
• Recycled water distribution

Headquarters

HQ city

Santa Rosa

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Operations, Personnel, Technology or R&D, Supply Chain

Revenue model

1. Wholesale Water Sales: Sonoma Water generates revenue through wholesale water supply contracts with nine cities and special districts in Sonoma and Marin counties. The agency delivers naturally filtered Russian River water to these contractors who provide drinking water to over 600,000 residents. Revenue is derived from water delivery charges as a regional wholesaler.
2. Sanitation Services: In 1995, Sonoma Water assumed responsibility for managing county sanitation zones and districts providing wastewater collection and treatment, and recycled water distribution services for approximately 22,000 residences and businesses. Revenue generated through sanitation rates and fees.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Sonoma Water is a wholesale water agency that captures, treats, and delivers naturally filtered Russian River water through a 79-mile aqueduct transmission system to nine municipal contractors serving over 600,000 residents in Sonoma and Marin counties. The agency also provides flood protection infrastructure (dams, reservoirs, creeks), wastewater collection and treatment services to approximately 22,000 residences and businesses, recycled water production and distribution, and groundwater management under California's Sustainable Groundwater Management Act.

Product overview

Sonoma Water operates as a regional water management agency providing water supply, flood protection, sanitation, and groundwater management services. The core offering is its water transmission system delivering Russian River water to over 600,000 residents. Key products include Forecast-Informed Reservoir Operations (FIRO) for optimized water management, the Atmospheric Rivers Research Partnership with Scripps CW3E, Advanced Quantitative Precipitation Information (AQPI), groundwater banking, and recycled water production. The agency also provides sanitation services to approximately 22,000 residences and maintains extensive flood protection infrastructure.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 33,000 acre-feet of additional water storage in 2026 through FIRO operations
• +4 more outcomes

Named customers9 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability4 records

Feature5 records

Partnerships

14 partnerships are on record, tiered core, major and minor.

• Scripps Institution of Oceanography / Center for Western Weather and Water Extremes (CW3E)coreStrategic or Co-development PartnerCooperative agreement to advance research in ocean science and meteorology. Partnership helps define the role of atmospheric rivers in filling Lake Mendocino and develops feasibility assessment for forecast-informed reservoir operations (FIRO). CW3E leads AR Reconnaissance program to improve forecast accuracy. Partnership is central to Sonoma Water's climate adaptation strategy.
• U.S. Army Corps of EngineerscoreStrategic or Co-development PartnerUSACE is the federal partner for Lake Mendocino and Lake Sonoma flood control operations. Implemented new FIRO protocol at Lake Mendocino, updating the facility's water control manual for the first time since 2011. USACE determines flood control releases when lake levels are above water supply pools. Joint efforts on water control manuals and reservoir operations.
• National Oceanic and Atmospheric Administration (NOAA)coreStrategic or Co-development PartnerNOAA supports atmospheric river research and forecasting through partnerships with Scripps CW3E. NOAA's Earth System Research Laboratory provides atmospheric river portal data. NOAA representatives participated in congressional briefings on atmospheric rivers and FIRO.
• Eel-Russian Project AuthoritycoreStrategic or Co-development PartnerJoint powers authority created at end of 2023 to negotiate with PG&E regarding surrender of Potter Valley Project. Board consists of representatives from Mendocino County Inland Water and Power Commission, Sonoma Water, Sonoma County, and Round Valley Indian Tribes. Aims to secure water for Russian River and improve Eel River fisheries through dam removal and new diversion facilities.
• CalTroutmajorStrategic or Co-development PartnerTrout conservation organization and co-proponent of revised Potter Valley Project proposal to PG&E. Coalition aims to remove Scott and Cape Horn Dams on Eel River and construct new diversion facility. Signed onto amended proposal in November 2023.
• Round Valley Indian TribesmajorStrategic or Co-development PartnerTribal partner in Eel River Recovery MOU and Eel-Russian Project Authority. Pledged support for removal of two dams on Eel River to aid fisheries recovery and ensure water supply for Russian River communities. Partner in Potter Valley Project negotiations.
• Trout UnlimitedmajorStrategic or Co-development PartnerConservation organization that signed onto amended Potter Valley Project proposal in November 2023. Partner in efforts to ensure proper dam removal and fish passage on Eel River.
• California Department of Fish and Wildlife (CDFW)majorStrategic or Co-development PartnerState agency that pledged $18 million towards Eel River dam removal effort. Signatory to historic MOU on Eel River Recovery with California Trout and Round Valley Indian Tribes. Goal is to open over 288 miles of river for salmon runs.
• North Marin Water DistrictmajorStrategic or Co-development PartnerRegional water district collaborating with Sonoma Water and Marin Municipal Water District on infrastructure projects including the Atmospheric River Capture initiative to enhance water storage and flood protection. Implementing advanced technologies such as FIRO and smart metering.
• Marin Municipal Water DistrictmajorStrategic or Co-development PartnerMarin County water district collaborating with Sonoma Water and North Marin Water District on the Atmospheric River Capture initiative and advanced water management technologies including FIRO and smart metering for climate adaptation.
• City of PetalumamajorStrategic or Co-development PartnerPartner in Aquifer Storage and Recovery (ASR) pilot project. City is launching ASR program to test storing treated drinking water in underground aquifers for dry period use. Initiative involves injecting water from Sonoma Water into Del Oro Well. Part of broader regional collaboration with groundwater sustainability agencies.
• Petaluma Valley Groundwater Sustainability AgencyminorStrategic or Co-development PartnerGroundwater sustainability agency partnering with Sonoma Water and City of Petaluma on ASR pilot project and sustainable water management strategies for Petaluma Valley groundwater basin.
• Mendocino County Inland Water and Power CommissioncoreStrategic or Co-development PartnerRepresented on Eel-Russian Project Authority board. Original co-proponent with Round Valley Indian Tribes and Sonoma Water of proposal to preserve water diversions through Potter Valley Project. Key stakeholder in Eel River dam removal negotiations.
• Humboldt CountymajorStrategic or Co-development PartnerCounty that signed onto amended Potter Valley Project proposal in November 2023. Stakeholder in Eel River recovery efforts and dam removal discussions.

Scale indicators9 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Contra Costa Water District: Contra Costa Water District serves 550,000 customers in Contra Costa County with wholesale and retail water service, including operation of the Contra Costa Canal and Rock Slough intake. It is comparable to Sonoma Water as a Bay Area water utility with similar conveyance and storage infrastructure.
• East Bay Municipal Utility District (EBMUD): EBMUD is a California wholesale and retail water utility serving approximately 1.4 million customers in Alameda and Contra Costa counties. Like Sonoma Water, it operates reservoir infrastructure, wholesale water supply contracts, and wastewater services — making it a structurally analogous California water utility with similar regulatory and operational characteristics.
• San Diego County Water Authority: San Diego County Water Authority is a wholesale water agency supplying 24 member agencies serving 3.3 million people. It operates major conveyance infrastructure (aqueducts, pipelines) similar to Sonoma Water's Russian River system and is a comparable mid-sized California wholesale water utility.
• Santa Clara Valley Water Authority (Valley Water): Valley Water is the wholesale water supplier for Santa Clara County, serving 2 million residents through 13 water retailers. Comparable to Sonoma Water in structure (wholesale water agency with groundwater banking, recycled water, and flood protection mandates), it represents a direct peer in the Bay Area/California water agency ecosystem.
• Marin Municipal Water District: Marin Municipal Water District is both a customer and a direct peer of Sonoma Water, receiving wholesale water supply and collaborating on the Atmospheric River Capture initiative. It operates its own reservoir system (Mount Tamalpais watershed) and water treatment facilities, making it a comparable Northern California water utility.
• Sacramento Regional County Sanitation District (Regional San): Regional San operates the largest wastewater treatment facility in California and provides wastewater services to 1.6 million residents. Like Sonoma Water's sanitation zones/districts, it operates regional wastewater infrastructure and is comparable in government-entity structure and regulated utility economics.

Broad incumbents

• Metropolitan Water District of Southern California: Metropolitan is the largest wholesale water supplier in the United States, delivering water to 26 member agencies serving 19 million Californians. It shares Sonoma Water's wholesale-only model and large-scale conveyance infrastructure (Colorado River Aqueduct, State Water Project) but operates at vastly greater scale and across a much larger service territory.
• California Water Service Company (Cal Water): Cal Water is an investor-owned utility serving nearly 2 million customers across California. While it differs in private vs. public ownership, it operates similar regulated water utility infrastructure (reservoirs, treatment, distribution) and provides a useful comparability point for operational scale and regulatory framework.

Regional players

• Zone 7 Water Agency: Zone 7 is a water agency serving the Livermore-Amador Valley in Alameda County, providing wholesale water, flood protection, and groundwater management. It combines water supply, flood protection, and groundwater management mandates similar to Sonoma Water's diversified portfolio, though serving a different Northern California geography.

Others

• Central Valley Flood Protection Board: While not a water supply agency, the Central Valley Flood Protection Board manages flood management infrastructure across California's Central Valley. It provides a relevant comparability reference for Sonoma Water's flood protection mandate (Warm Springs Dam, Coyote Valley Dam, Matanzas Creek Reservoir, 80+ miles of creek maintenance).

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/sonoma_water
• Xx.com/sonomawater
• Facebookfacebook.com/sonomawater

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sonoma Water