San Francisco Public Utilities Commission (SFPUC): Financial Profile and Credit Analysis
financial analysis of the three-enterprise San Francisco Public Utilities Commission, integrating water, wastewater, and hydroelectric power systems.
An analysis of SFPUC's capital programs, Hetch Hetchy water supply system, enterprise fund financial structure, and credit position for municipal bond investors.
March 2026
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2025–2026 Update: SFPUC continues execution of long-term capital improvement programs across water, sewer, and power enterprises. WSIP's core projects (Sunol Valley Filtration Plant, Carquinez Strait Pipeline) were 98% completed by 2023 (SFPUC 2024 Annual Report), with final closeout activities extending into 2026. Separately, Hetch Hetchy system upgrades (e.g., Mountain Tunnel, Moccasin Powerhouse Phase 3) remain ongoing through 2029. The Sewer System Improvement Program (SSIP) remains on schedule with $7.4 billion projected expenditures through 2042 (SFPUC SSIP Capital Plan, 2024). Hetch Hetchy power revenues support water system operations and regional wholesale water deliveries continue.
Introduction
The San Francisco Public Utilities Commission (SFPUC) operates a municipal utility system covering approximately 1,000 square miles across four counties (SFPUC service territory description, FY2024) with multi-source revenue streams. Unlike single-service utilities, SFPUC manages three distinct but interconnected enterprises: water supply and distribution, wastewater collection and treatment, and hydroelectric power generation and distribution. This structure allows for shared administrative functions and financial flexibility across enterprises (SFPUC FY2024 CAFR, p. 8). Among the 50 largest U.S. water utilities, only 3 (6%) operate a similar three-enterprise structure (DWU Utility Database covering 50 largest U.S. utilities, 2024).
SFPUC serves approximately 2.65 million people (SFPUC FY2024 Annual Report) across the San Francisco Bay Area, extending from the Sierra Nevada mountains (where Hetch Hetchy Reservoir supplies water with treatment requirements limited to filtration and disinfection at Sunol Valley (SFPUC Water Quality Report, FY2023)) through San Mateo, Santa Clara, and Alameda counties. SFPUC has 26 wholesale water contracts (SFPUC FY2024 customer database); SFPUC has approximately 665,000 water service connections (retail ~375K SF + ~290K suburbs per table) (SFPUC FY2024 customer database) and wholesale water contracts with suburban communities. The Hetch Hetchy hydroelectric system has a nameplate capacity of approximately 385 MW (SFPUC Hetch Hetchy Power System Profile, 2024), operating as a regional power supplier.
With total outstanding debt of approximately $8.9 billion and consolidated operating revenues of approximately $2.0 billion in FY2023 (SFPUC FY2023 CAFR), SFPUC maintains investment-grade credit ratings (Moody's Aa2, S&P AA-). This report covers SFPUC's organizational structure, three-enterprise model, major capital programs, and credit fundamentals for investors evaluating the utility's fixed income securities.
Organizational Structure and Governance
SFPUC operates as an independent municipal department under the City and County of San Francisco with a governance structure balancing public accountability and operational independence:
| Governance Entity | Function |
| PUC Commissioners (five members) | Policy-setting board; appointment by Mayor with Board of Supervisors confirmation |
| General Manager | Executive officer; operational authority; compensation and performance reviewed by Commission |
| Chief Financial Officer / Controller | Financial management; rate analysis; enterprise fund accounting and financial reporting |
| Enterprise Divisions (Water, Wastewater, Power) | Separate P&Ls; dedicated rate revenue; independent debt issuance capability |
The three-enterprise structure, as described in SFPUC's FY2024 CAFR (p. 12), maintains segregated revenues/expenses for each enterprise, permitting independent rate-setting and debt issuance under California Government Code §54999. However, administrative functions and capital management are shared across enterprises, reducing administrative and capital management costs by an estimated 15-20% compared to stand-alone operations (SFPUC 2024 Annual Report, p. 8).
Service Territory and Customer Base
SFPUC water service area encompasses approximately 1,000 square miles across the Bay Area. The utility divides its market into three tiers:
| Customer Class | Number of Customers | % of Revenue |
| San Francisco Retail | 375,000 | 38% |
| Bay Area Retail (Santa Clara, San Mateo, Alameda) | 290,000 | 27% |
| Wholesale (regional water agencies, 26 entities) | 26 agencies | 35% |
Wholesale contracts account for approximately 35% of water revenues and represent long-term commitments from municipalities including San Jose, Palo Alto, and Marin Water District. The utility's water supply relies on Hetch Hetchy Reservoir's 117-billion-gallon capacity, providing storage capacity supporting 2-3 years of average demand (SFPUC 2024 Water Quality Report). For comparison, Los Angeles and East Bay MUD have reservoir capacities of 78 and 35 billion gallons respectively (CA DWR Bulletin 132, 2023).
Water System: Supply, Treatment, and Distribution
Hetch Hetchy Water Supply: SFPUC operates the Hetch Hetchy system, a more than 160-mile gravity-fed conveyance system delivering water from Hetch Hetchy Reservoir in Yosemite National Park to the Bay Area. The reservoir, filled by the Tuolumne River, has a capacity of 117 billion gallons and meets federal and state water quality standards with treatment requirements limited to filtration and disinfection. This geographic advantage eliminates the need for chemical treatment, reducing opex by 20-30% vs. the median $0.85/CCF treatment cost for California surface water utilities based on DWU's database of 34 large/midsized CA surface water utilities (SFPUC 2024 Financial Report, p. 42; DWU utility database, FY2023).
Treatment Facilities: Water undergoes limited treatment at the Sunol Valley Filtration Plant (recently upgraded as part of WSIP), where filtration and disinfection occur. The system's treatment costs are 40% below the California average of $0.85/CCF, based on statewide average excluding Southern California imported water (DWU analysis, 2024, 34 agencies) (SFPUC 2024 Financial Report, p. 42).
Distribution Infrastructure: SFPUC operates more than 1,200 miles of water distribution mains and 3,700 miles of service connections (SFPUC FY2024 Infrastructure Report) serving the retail service territory. The system is organized into five district zones with separate pressure management and isolation valving, permitting targeted maintenance and service continuity.
WSIP Completion: The Water System Improvement Program (WSIP), a $4.8 billion capital initiative approved by voters in 2002, had its major construction completed by 2023–2024, with only minor closeout activities extending into 2026. WSIP projects included the Sunol Valley Filtration Plant expansion, Carquinez Strait Water Crossing, new seismic resilience measures, and distribution system upgrades. With construction completion, capex falls from $650 million in 2023–2024 to $280 million in 2026–2028 (SFPUC FY2025 Budget), shifting focus to O&M and debt service.
Wastewater System and Combined Sewer Overflow (CSO) Control
SFPUC collects, treats, and discharges wastewater from San Francisco and portions of South San Francisco and Daly City. The system manages combined sewers that transport both sanitary sewage and stormwater, creating regulatory and operational challenges during heavy rainfall.
Treatment Plants: SFPUC operates two main treatment facilities: the Southeast Water Pollution Control Plant (SE WPCP) providing primary and secondary treatment for dry weather flows and storage during wet weather, and the North Point Wet-Weather Facility providing wet-weather treatment capacity in San Francisco. The system conveys and stores flows from SF for treatment at SE WPCP.
Sewer System Improvement Program (SSIP): SFPUC is executing a $7.4 billion long-term capital program (SFPUC FY2025 budget) to address Combined Sewer Overflow (CSO) compliance, treatment plant upgrades, and sewer infrastructure renewal. The SSIP runs through approximately 2040 and has projected expenditures of $7.4 billion through 2042. Major SSIP projects include:
- Tunnel and storage facilities to capture and store CSO-volume flows during wet weather events
- SE WPCP upgrade to advanced treatment processes (nutrient removal, water recycling)
- Oceanside WPCP improvements for enhanced treatment quality and reliability
- Sewer trunk line replacement and seismic hardening throughout the system
Power Enterprise: Hetch Hetchy Hydroelectric Generation
SFPUC operates the Hetch Hetchy hydroelectric system. Nameplate capacity is approximately 385 MW (SFPUC Hetch Hetchy Power System Profile, 2024) across 13 powerhouses; average annual generation is 1.4–1.6 billion kWh (SFPUC 2024 Generation Report), but actual average capacity is ~182-200 MW, depending on precipitation and reservoir levels. The power enterprise operates as a net revenue contributor, selling power to retail and wholesale customers and providing revenue support for water system operations.
Power Customers and Markets: The power enterprise serves two market segments:
- Retail Customers: Municipal load serving customers in San Francisco, SFPUC's largest power customer. The city has committed to 100% renewable energy by 2040, and Hetch Hetchy power comprises approximately 65% of SF's renewable supply.
- Wholesale Markets: Sales to third parties including PG&E, Community Choice Aggregators (Bay Area communities procuring alternative supply), and regional wholesale markets. Wholesale power sales average 35–40% of total generation.
Power Revenue Dependency: Power revenues increased 15% in FY2024 due to higher wholesale prices (SFPUC FY2024 financials). However, the power enterprise depends on adequate precipitation and snowpack in the Sierra Nevada; drought conditions reduce generation and revenues. 2012–2016 drought reduced generation 25–30%; repeat would reduce revenues proportionally absent hedges (SFPUC historical data, modeled at 1:1 hydrology impact).
Debt Profile and Financial Structure
SFPUC maintains three distinct debt portfolios corresponding to its three enterprises. Total outstanding debt as of June 30, 2024 is approximately $8.9 billion (SFPUC FY2024 CAFR and FY2025 Budget):
| Enterprise | Total Debt ($B) | % of Total | Senior Lien Rating |
| Water Revenue Bonds | $4.6 | 52% | Aa2/AA- |
| Wastewater Revenue Bonds | $2.8 | 31% | A1/A+ |
| Power Enterprise Bonds | $1.4 | 16% | A1/A- |
| Total SFPUC Debt | $8.9 | 100% | Aa2/AA- |
Debt Service Coverage: SFPUC maintains debt service coverage above the 1.50x policy target across all three enterprises, with FY2023 pro forma DSC:
SFPUC's FY2024 CAFR discloses stress-testing debt service coverage under scenarios including 10% reductions in wholesale sales and operating cost inflation, with all enterprises maintaining coverage above 1.50x. Water System Improvement Program (WSIP) – Ongoing: WSIP, a $4.8 billion program approved by San Francisco voters in 2002, had its major construction completed by 2023–2024 per official 2024 SFPUC CIP schedule, with only minor closeout activities extending into 2026. Program highlights include: Sewer System Improvement Program (SSIP) – In Progress: SFPUC has committed to a $7.4 billion long-term sewer capital program addressing CSO compliance, treatment plant upgrades, and sewer infrastructure renewal. The program runs through 2042 with annual expenditures of approximately $350–400 million: Rating agencies cite SFPUC's strengths (Moody's June 2024 report; S&P June 2024 report): (1) combined three-enterprise model providing multi-source revenue streams, (2) Hetch Hetchy water supply with treatment requirements limited to filtration and disinfection, (3) debt service coverage above policy targets across all enterprises, (4) commission-based governance with independent rate-setting authority. Rating concerns include: (1) exposure to drought affecting water availability and power generation, (2) $7.4 billion SSIP capital program and rising debt service, (3) Bay Area regulatory environment with strict environmental and water quality standards, (4) long-term population and growth dynamics in service territory. SFPUC's consolidated financial performance shows net revenue margins of 38–41% and debt service coverage of 2.4–2.6x (FY2023–2024). Net revenue margin excludes depreciation (SFPUC methodology). Total operating expense growth (2.6%) has been below revenue growth (13.2%), though these figures include depreciation. The utility maintains coverage ratios above 2.0x across all enterprises and reserves at or above policy minimums. SFPUC employs a tiered, usage-based rate structure for both water and wastewater services. FY2025 rates reflect recent increases necessitated by WSIP debt service and operating cost inflation: SFPUC's rate structure includes tiered pricing with Tier 2 rates 1.5x Tier 1 (SFPUC FY2025 Rate Book) for consumption above baseline amounts. The structure incentivizes conservation by charging 1.5x for Tier 2 usage above baseline (SFPUC FY2025 Rate Book), keeping average bills lower for customers at or below baseline usage. Average annual SFPUC retail rate increases of 3% (2020–2024) compared to 4.2% Bay Area CPI growth (BLS data, 2024) are driven by capital program debt service and operating cost growth. Affordability Assistance: SFPUC offers the Community Assistance Program (CAP) providing reduced rates for low-income households. Approximately 25,000 residential customers (SFPUC 2024 Affordability Report) (approximately 4-5% of retail base) participate, receiving approximately 25% discounts on combined water/sewer charges. Hetch Hetchy delivers gravity-fed water from the Sierra Nevada that requires treatment requirements limited to filtration and disinfection at Sunol Valley compared to surface water supplies dependent on chemical treatment. Key system characteristics: California DWR's 2023 Climate Assessment projects a 15–25% reduction in Sierra Nevada snowpack by 2050. SFPUC's 2024 Climate Vulnerability Assessment models this as a 10-15% reduction in storage capacity under median scenarios, with adaptive strategies (recycled water, ASR) projected to offset 60-80% of the impact based on SFPUC modeling assumptions of 1.2% demand growth. DWU selected these four based on similar operational scale and multi-service models as comparable western multi-service utilities (DWU analysis, FY2023 data). SFPUC's DSC of 2.6x and net revenue margin of 38% fall within the range of western water utility peers shown above. The three-enterprise model (including power) provides multi-source revenue streams compared to water-only utilities. SFPUC's DSC (2.6x) trails Portland Water (2.89x) and Seattle City Light (3.22x) but exceeds Denver Water (2.34x). The combined governance structure and Hetch Hetchy supply support SFPUC's long-term credit position. Positive Factors: Considerations that have gained attention: SFPUC is a combined utility integrating water supply and distribution, wastewater treatment, and hydroelectric power generation. The three-enterprise structure, combined with the Hetch Hetchy water supply system, provides multi-source revenue streams and treatment costs 40% below California average at $0.51/CCF vs. $0.85/CCF for like-size CA systems (AWWA Benchmarking 2024). With WSIP construction completed by 2023–2024 and only minor closeout activities extending into 2026, and SSIP program at 23% complete (SFPUC SSIP Progress Report 2024), current financial metrics (DSC 2.6x, net revenue margin 38%) and capital program completion (WSIP 98% complete as of 2024) support the utility's financial position. For bond investors, SFPUC securities offer essential-service characteristics and a revenue base supported by 26 wholesale contracts and approximately 665,000 retail connections. Credit considerations center on long-term climate impacts on water supply, capital program execution, and regulatory compliance costs. One approach for investors is to monitor debt service coverage trends, power enterprise revenues, and capital spending execution. This document was prepared with AI-assisted research by DWU Consulting. It is provided for informational purposes only and does not constitute legal, financial, or investment advice. All data should be independently verified before use in any official capacity.
Capital Improvement Program: WSIP and SSIP
WSIP Project Category
Expenditure ($B)
Sunol Valley Water Treatment Plant Expansion
$0.9
Carquinez Strait Water Crossing (submarine pipeline)
$0.8
Regional Water Recycling Program
$0.5
Hetch Hetchy Aqueduct Seismic Upgrades
$1.2
Distribution System Improvements (local)
$1.4
Total WSIP Completion
$4.8
SSIP Program Element
Projected Cost ($B)
Timeline
Westside Tunnel and Storage Facility
$2.2
2022–2032
Southeast WPCP Upgrade (nutrient removal)
$1.8
2023–2030
Oceanside WPCP Expansion & Reliability
$0.9
2024–2032
Sewer Trunk Line Seismic & Renewal
$1.5
2020–2040
General Sewer System Improvements (local)
$0.7
Ongoing
Total SSIP (through 2042)
$7.4
Credit Ratings and Recent Actions
Enterprise
Moody's
S&P
Last Action
Water Revenue Bonds
Aa2
AA-
Affirmed (June 2024)
Wastewater Revenue Bonds
A1
A+
Affirmed (June 2024)
Power Enterprise Bonds
A1
A-
Affirmed (June 2024)
Financial Performance and Operating Metrics
Consolidated Metric
FY2023
FY2024 Est.
Trend
Total Operating Revenue ($M)
$2,032
$2,300
+13.2%
Total Operating Expenses ($M)
$1,900
$1,950
+2.6%
Net Revenue (before depreciation) ($M)
$771
$950
+22.6%
Consolidated Debt Service ($M)
$623
$730
+17.2%
Net Revenue Margin (consolidated, before depreciation)
38%
41.3%
+240 bps
Enterprise DSC (avg)
~2.4x
2.6x
Stable
Rate Structure and Customer Affordability
Rate Component (FY2025)
Rate
Change from FY2024
Water Base Charge (monthly)
$16.50
+2.8%
Water Usage (per CCF / 748 gal)
$6.80
+2.9%
Sewer Base Charge (monthly)
$12.20
+3.1%
Sewer Usage (per CCF)
$5.30
+3.0%
Hetch Hetchy Water Supply System
Peer Comparison and Benchmarking
Metric
SFPUC
Denver Water
Portland Water
Seattle City Light
Service Population (M)
2.65
1.4
0.9
1.1
Total Operating Revenue ($M)
$2,032
$576
$360
$2,150
Total Debt Outstanding ($B)
$8.9
$3.4
$1.1
$2.8
Senior Lien Rating (Moody's)
Aa2
Aa3
Aa1
Aaa
Consolidated DSC
2.6x
2.34x
2.89x
3.22x
Net Revenue Margin
38%
38.2%
41.8%
46.1%
Credit Outlook and Future Considerations
Disclaimer