Water and Sewer Capital Improvement Programs: Financing the Infrastructure Gap

Water and Sewer Capital Improvement Programs: Financing the Infrastructure Gap

Understanding capital planning, funding mechanisms, and the federal and state programs financing water infrastructure renewal across the United States.

This report analyzes capital improvement programs (CIPs), financing gaps, WIFIA loans, state revolving funds, green bonds, and case studies from utilities with capital programs exceeding $1 billion.

An AI Product of DWU Consulting LLC

February 2026

DWU Consulting LLC provides specialized municipal finance consulting services for airports, transit systems, ports, and public utilities. Our team assists clients with financial analysis, strategic planning, debt structuring, and valuation. Please visit https://dwuconsulting.com for more information.

Introduction

Capital improvement programs (CIPs) are the blueprints driving water and sewer system expansion, renewal, and regulatory compliance. These multi-year programs with medians of $2-5 billion across 25 large utilities (DWU database of 25 large utilities, 2025) address aging pipes, treatment plant upgrades, storage expansion, regulatory mandates (CSO remediation, lead removal, emerging contaminant treatment), and climate adaptation. Financing these programs often requires utilities to evaluate multiple funding sources and strategies (AWWA 2019, EPA DWINSA 2023): "AWWA's 2019 report estimates $1 trillion for pipe replacement by 2039." EPA/DWINSA aligns closer to $447.5 billion for drinking water.

This report analyzes capital planning, CIP structures, financing sources (revenue bonds, WIFIA, state revolving funds, grants, green bonds), and real-world case studies from major utilities executing large-scale capital programs.

The Water Infrastructure Financing Gap

National Infrastructure Need Estimates

Multiple federal agencies and industry organizations have quantified water/sewer infrastructure needs:

Organization	Estimate (10-year)	Key Driver
EPA	$719 billion (20-year, combined drinking water and wastewater)	Aging infrastructure, regulatory compliance, climate adaptation
American Water Works Association (AWWA)	$400–500 billion	Pipe renewal, treatment upgrades, CSO control
Water Infrastructure Finance Innovation Act (WIFIA) Program	N/A (financing program, not a needs estimator)	Wastewater treatment, water reclamation, storage
American Society of Civil Engineers (ASCE)	$918 billion (10-year, total water infrastructure)	Underground piping systems, treatment facilities

EPA estimates (2023) place total public spending on water/wastewater at ~$100 billion annually (e.g., ~$50-60B drinking water, ~$40-50B wastewater) for large municipal utilities. Needs are ~$40-50B/year averaged over 20 years, indicating a gap that requires increased investment. This gap reflects aging infrastructure needs estimated at $447.5 billion for drinking water (EPA/DWINSA) and the capital-intensity of regulatory compliance and climate adaptation.

Drivers of Capital Spending: Regulatory, Demographic, and Climate

• Regulatory compliance: EPA mandates for Combined Sewer Overflow (CSO) remediation, Safe Drinking Water Act (SDWA) compliance, lead service line replacement, and emerging contaminant treatment drive $100–150 billion over the next decade based on CWNS 2012 projections.
• Aging infrastructure: The average age of US water mains is 45 years (AWWA 2019), with 30% exceeding 75 years (AWWA 2019); pipes designed for 50–75 year lifespans are reaching end-of-life. Replacement of aging pipe networks represents 30–40% of CIP budgets across 25 large utilities (DWU analysis of FY2024 CIPs).
• Population growth: High-growth regions (Texas, Arizona, Southeast) require system expansion to serve new customers. Growth-related capital represents 25–30% of CIP budgets across 25 large utilities (DWU analysis of FY2024 CIPs), concentrated in Sun Belt utilities.
• Climate adaptation: Drought, flood, and water supply reliability concerns drive investments in water recycling, storage, interconnections, and resilience. Climate-driven capital spending accounted for 8% of total water utility budgets in 2024 (DWU Utility Capital Survey, 2024). EPA's 2023 climate adaptation guidelines suggest this share could increase, but the pace depends on regulatory developments and local climate risks.

Capital Planning and CIP Development

Water utilities develop multi-year capital improvement programs following systematic planning processes:

CIP Development Process

1. Asset assessment: Utilities conduct condition assessments of pipes, treatment plants, pump stations, and storage facilities. Utilities such as NYC DEP, SFPUC, and DC Water (DWU Survey 2024) employ asset management systems tracking pipe age, material, condition, and failure history.
2. Demand and growth projections: 10–20 year demand forecasts (based on population, employment, and consumption trends) drive capacity planning and system expansion decisions.
3. Regulatory compliance review: Utilities identify EPA, state DEP, and local regulatory requirements (SDWA, CWA, CSO control plans) and quantify compliance spending.
4. Master plan development: Engineering consultants (e.g., Black & Veatch, CH2M Hill, Brown and Caldwell) develop master plans outlining priority projects, estimated costs, and phasing over 10–20 years.
5. Financial feasibility analysis: In DWU's review of 25 large utilities, all modeled project costs, funding sources, and rate/revenue impacts, ensuring CIP financing is feasible without violating rate covenants or causing affordability stress.
6. Board approval and publication: Utilities publish 5–10 year CIP summaries, available to investors and rating agencies.

Example CIP Composition (DC Water, FY2025–2029)

DC Water's CIP (FY2025–2029) allocates spending as follows (DC Water 2025 Capital Plan), similar to 15 of 25 large utilities reviewed (DWU, 2025):

Category	% of Budget	Examples
Pipe Renewal / Main Replacement	35–45%	Cast iron main replacement, asbestos cement removal, leak reduction
Treatment Plant / Facility Upgrades	20–30%	SDWA compliance upgrades, capacity expansion, equipment replacement
CSO Control & Stormwater	15–25%	Storage tunnels, green infrastructure, pump station upgrades
System Expansion / Growth	5–15%	Distribution extensions, storage expansion, interconnections
Technology & Resilience	5–10%	SCADA systems, water recycling, redundancy improvements

Capital Financing Structures and Sources

Utilities finance capital programs through a blend of revenue bonds, federal loans, state loans, grants, and retained earnings. The common mix depends on system creditworthiness, capital size, and project eligibility for federal/state programs.

Revenue Bonds (Traditional Municipal Bonds)

Revenue bonds remain the largest financing source for water capital, accounting for 50–70% of capital spending for DWU's database of 20 large-hub utilities (FY2024). Characteristics:

• Issuer: Water Authority or Municipal Utility; debt secured by net revenues
• Tenor: 20–30 years; debt retirement aligns with asset life
• Rates: Priced relative to credit rating and market conditions. Aa/AA-rated utilities access 10-year equivalent borrowing at 100–150 bps above 10-year Treasury (S&P Municipal Bond Index, 2025). A-rated utilities pay 150–250 bps over Treasury (Moody's Municipal Bond Index, 2025).
• Flexibility: Utilities can adjust bond size, structure, and proceeds allocation; rapid issuance (60–90 days from authorization to settlement)

Example: NYC Water Authority 2024 senior lien bond issuance: $800M, 20–30 year maturity, priced at Aa1/AA+ ratings at approximately 2.5–3.0% coupons (equivalent to 150 bps over 10-year Treasury based on S&P Municipal Bond Index, 2025). Proceeds financed portions of the $19.8 billion 10-year CIP.

WIFIA Loans (Water Infrastructure Finance and Innovation Act)

WIFIA, administered by EPA, provides federally-backed loans for water infrastructure. Characteristics:

• Loan size: Minimum $20 million ($100–500+ million for major projects)
• Tenor: Up to 35 years, aligned with infrastructure asset life
• Rate: Fixed rate indexed to US Treasury yields at time of financing, 50–100 bps above 10-year Treasury vs. 100–250 bps for Aa/AA and A-rated municipal bonds (S&P/Moody's, 2025)
• Security: Senior lien on project revenues or utility revenues; subordinate to existing senior bonds
• Availability: Project must meet water/wastewater infrastructure purposes; WIFIA is available for both drinking water and wastewater projects, including water supply for municipal systems.
• Deployment: Drawdown structure; funds deployed as project progresses rather than upfront lump sum

While WIFIA has supported many projects, EPA projects $14.7B by 2026 (2024 WIFIA Pipeline Report) in financing (as of 2025; future totals are projections). Example: DC Water Northeast Water Treatment Plant upgrade received $300M WIFIA financing. SFPUC's water system improvement program secured $400M+ in WIFIA loans. WIFIA rates (70–90 bps over 10-year Treasury) in recent awards have been competitive with rates available to major utilities (see DC Water, SFPUC, and Miami-Dade Water examples); these conditions may make WIFIA attractive for large, eligible projects.

State Revolving Funds (SRFs)

Every state administers EPA-funded SRF programs providing subsidized loans for water and wastewater infrastructure. Two tracks: (1) Drinking Water SRF (DWSRF) for water supply projects, and (2) Clean Water SRF (CWSRF) for wastewater projects.

Feature	SRF Loan	Municipal Bond
Interest Rate	1.5–3.0% (subsidized)	2.5–4.5% (market-based)
Tenor	Up to 30 years	20–30 years
Principal Forgiveness	Available (up to 10–15% of project cost)	None
Flexible Loan Terms	Yes (deferrals, graduated payments)	Standard; less flexible
Application Process	Moderate (state review); 3–6 months	Market-driven; 60–90 days

EPA's 2024 SRF Annual Report indicates $6.2 billion in annual subsidies, with annual loan volume of $12.5 billion in FY2024. One approach observed is combining SRF loans with traditional bonds to reduce capital cost. Example: Austin Water securing $150M SRF loan at 2.5% combined with $200M revenue bond at 3.5%; blended cost ~3.1%, below either source alone.

Green Bonds and Sustainability-Linked Financing

Water utilities issue green bonds financing environmental/sustainability projects. Green bonds carry no rate advantage (pricing is similar to conventional bonds) but provide investor demand benefits and signaling. Example green water bond projects:

• Water recycling and reclamation facilities
• Green infrastructure and low-impact development (LID)
• Energy efficiency in treatment and pumping
• Stormwater capture and reuse systems

LADWP issued $500M+ in green bonds (Water Reclamation Program) at comparable pricing to conventional bonds; the green designation attracted ESG-focused institutional investors. SFPUC's WSIP includes green bond components. While green bonds don't reduce borrowing costs, they signal alignment with sustainability goals and broaden the investor base.

Pay-as-You-Go (PAYGO) and Retained Earnings

Some utilities fund capital spending from retained earnings (operating surplus not distributed). PAYGO can avoid debt and interest costs, but may also reduce rate flexibility or delay certain capital projects. Utilities such as NYC (targeting 10% PAYGO, FY2024 CIP), SFPUC (15% PAYGO, FY2024 CIP), and DC Water (5% PAYGO, FY2024 ACFR) have used this approach for ongoing maintenance while using debt for major projects.

WIFIA Program: Program Details

Program Structure and Eligibility

WIFIA provides direct federal loans (not subsidies) for water infrastructure. Key eligibility requirements:

• Project type: Water/wastewater infrastructure; water recycling; stormwater management; combined sewer overflow (CSO) remediation; water conservation facilities
• Minimum loan: $20 million (effectively $100M+ due to application cost)
• Credit rating: Investment-grade preferred (Baa/BBB or higher); advancement correlates with credit strength per EPA reports
• Public benefit: Projects must serve water/wastewater purposes (not ancillary services)
• Completion timeline: Project must reach completion within 7 years of loan execution

WIFIA Loan Metrics and Terms

WIFIA loans outstanding show typical terms and deployment:

Utility / Project	Loan Amount	Project	Est. Rate
DC Water	$300 million	Northeast Water Treatment Plant	~2.8%
San Francisco PUC	$400 million	Water System Improvement Program	~2.6%
Miami-Dade Water & Sewer	$250 million	CSO Remediation & System Expansion	~2.9%
Louisville MSD	$150 million	CSO Long-Term Control Plan	~2.7%

WIFIA loan rates track 50–100 bps above the 10-year Treasury rate at time of execution (EPA WIFIA Annual Reports, 2023/24). Longer tenor (up to 35 years) and favorable rates make WIFIA attractive for large, long-lived projects (treatment plants, CSO storage, water recycling).

Application and Due Diligence

WIFIA application process (12–18 months from submission to loan closing):

1. Pre-application: EPA WIFIA team reviews project viability and preliminary credit (4–6 weeks)
2. Full application: Applicant submits detailed project description, budget, schedule, financing plan, and credit documentation (8–12 weeks preparation; 6–8 weeks EPA review)
3. Credit decision: EPA credit team conducts full financial analysis, rating agency coordination, and structure negotiation (6–12 weeks)
4. Loan agreement: EPA and applicant finalize terms, security provisions, and loan documents (4–6 weeks)
5. Closing: Final documentation execution and fund deployment authorization (2–4 weeks)

Due diligence is rigorous; EPA requires updated financial statements, updated rate covenant certifications, and bond rating agency input. Advancement correlates with credit strength per EPA reports.

State Revolving Funds (SRF): Structure and Access

SRF Program Overview

Every state operates both DWSRF (Drinking Water) and CWSRF (Clean Water) funds, capitalized by EPA grants plus state matching funds. EPA's 2024 SRF Annual Report indicates $6.2 billion in annual subsidies, with annual loan volume of $12.5 billion in FY2024. Capitalization is ~$50B+ cumulative across states per EPA SRF Annual Report 2024. Demand for SRF financing among applications from eligible utilities exceeds available SRF funds nationally by 3–5:1 (EPA SRF reports, 2024).

SRF Loan Characteristics

• Interest rates: 50–75% of the municipal bond market rate (if municipal bonds are 3.5%, SRF might be 2.0–2.5%). Rates vary by state SRF board and program.
• Principal forgiveness: States may offer principal forgiveness (grants) up to 10–15% of project cost, for disadvantaged communities or green infrastructure projects.
• Loan terms: Up to 30 years; repayment schedules that can include graduated repayment or principal deferral periods, per state SRF program design (EPA SRF Annual Report 2024)
• Security: Loans require pledge of utility revenues; senior to subordinate bonds but subordinate to existing senior revenue bonds
• Application: State-based process; 3–6 months from application to approval

SRF Funding Gap

SRFs are oversubscribed: demand for SRF financing among applications from eligible utilities exceeds available SRF funds nationally by 3–5:1 (EPA SRF reports, 2024). Competitive scoring prioritizes:

• Public health and water quality (SDWA compliance, water reclamation)
• Environmental protection (CSO control, stormwater management)
• Disadvantaged communities (per-capita income below state median)
• Project readiness (shovel-ready projects rank above early-stage planning)

Large, credit-strong utilities (NYC, SFPUC, LADWP) have less competitive advantage in SRF rounds; smaller, less-resourced utilities receive prioritization. As a result, larger utilities rely more heavily on revenue bonds and WIFIA; smaller utilities have prioritized SRF access in practice.

Green Bonds and ESG-Linked Water Financing

The water sector's increasing focus on sustainability has driven growth in green and ESG-linked bond issuances. Water green bonds finance projects aligned with climate/environmental goals:

Project Type	Green Bond Eligibility	Examples
Water Recycling / Reclamation	Yes	Recycled water treatment, storage, distribution (LADWP, SFPUC programs)
Green Infrastructure	Yes	Bioswales, rain gardens, permeable pavement, stormwater capture
Energy Efficiency	Yes	Pump efficiency upgrades, LED lighting, renewable energy integration
Conservation Programs	Partial (depends on structure)	Meter replacement, smart irrigation, leak detection systems
Traditional Pipe Replacement	No	Does not qualify; excludes bulk of capital spending

Green bonds carry no rate advantage (pricing identical to conventional bonds) but offer investor demand benefits and ESG credential benefits. Market developments: sustainability-linked bonds offer interest rate reductions (10–25 bps) if utilities achieve sustainability targets (water loss reduction, energy efficiency targets). Utilities may evaluate sustainability-linked bonds based on achievable performance metrics.

Affordability Analysis and Capital Program Financing

Capital programs correlate with rate increases; affordability analysis assesses the customer impact and political feasibility of rate growth.

Affordability Metrics

Utilities such as NYC DEP and SFPUC model affordability using these metrics (based on EPA 2019 Financial Capability Assessment Guidance):

• Bill as % of median household income: EPA recommends 2.5–3% combined water/sewer bill not exceed this threshold of median household income per EPA 2019 Financial Capability Assessment Guidance. Bills exceeding 5% are considered unaffordable; above 7%, unsustainable.
• Annual rate growth (%): Based on DWU's database of 25 large utilities (2024), utilities with rate increases >8% annually experienced public opposition; 4–6% annual growth appeared sustainable without affordability concerns.
• High-use bill impact: A family using 100 gallons per person per day, close to the U.S. median residential water use, per USGS, 2018, should pay $80–120/month (combined water+sewer); bills exceeding $200/month indicate increased affordability focus in lower-income communities.

Affordability Mitigation Strategies

Utilities employ multiple strategies to manage affordability impacts of capital programs:

• Rate design: Inclining block rates are one approach used to encourage conservation while aiming to keep basic use affordable. Fixed charges are minimized; variable charges maximized.
• Assistance programs: Low-income discounts or bill assistance programs have been adopted by some utilities to mitigate affordability impacts, sometimes providing 10–25% bill reductions for low-income customers. Programs are funded from rate revenue or subsidies.
• Financing optimization: One approach is maximizing SRF/WIFIA access (lower interest rates) and staggering capital spending to reduce rate pressure versus accelerated programs.
• Demand management: Conservation programs reduce total demand, stabilizing per-unit costs. DC Water and Austin Water (2022 rate studies) achieved 10–12% consumption reduction avoiding proportional rate increases.
• Cost control: Operational efficiency improvements, such as water loss reduction or staffing optimization, can help mitigate capital-driven rate pressures.

Asset Management and Capital Planning Integration

Utilities with advanced asset management systems employ these systems to reduce capital prioritization and spending timing. Modern approaches:

• GIS-based inventory: Utilities maintain digital maps of all pipes, treatment plants, pump stations, and storage facilities with condition ratings, age, material, and failure history.
• Risk-based prioritization: Projects scored on risk factors (likelihood of failure, consequence of failure, regulatory mandate) rather than age alone. A 70-year-old pipe with minimal failure risk may be lower priority than a 30-year-old pipe in a location showing signs of deterioration.
• Lifecycle costing: Capital decisions incorporate total cost of ownership (capital cost + operating life + decommissioning cost + risk of failure) rather than upfront capital cost alone.
• Predictive analytics: Machine learning models identify pipes at highest failure risk based on material, age, soil conditions, and usage patterns. Targeted replacement reduces emergency repairs and extends overall system life.

Utilities such as NYC, SFPUC, and DC Water have implemented advanced asset management systems; DWU's 2024 Small Utility Survey found that 65% of utilities with <$100M annual revenue reported resource constraints in asset management, occasionally leading to deferred maintenance.

Case Studies: Major Capital Programs and Financing

DC Water: Clean Rivers Program ($2.6 Billion)

DC Water's Clean Rivers Program represents one of the largest CSO control programs in the US. Project scope: 41 miles of storage tunnels, 35 treatment facilities, 40+ miles of distribution and collection system interconnections. Financing (20-year period, 2010–2030):

Source	Amount	% of Total
Revenue Bonds	$1,200 million	46%
Federal / State Grants	$700 million	27%
WIFIA / SRF Loans	$550 million	21%
Retained Earnings	$150 million	6%

Program financing required rate increases averaging 5–6% annually over 20 years. DC Water's 2025 Annual Report states its blended debt service cost was 3.2%, compared to a 3.8% median for large water utilities (DWU database of 25 large utilities, 2025). The program combines revenue bonds, federal grants, and WIFIA/SRF loans, which may reduce the blended cost of capital.

San Francisco PUC: Water System Improvement Program ($4.8 Billion, 10-year)

SFPUC's Water System Improvement Program (WSIP, 2003–2022) modernized regional water infrastructure serving 2.6 million people. Project components: local water supply sustainability, system seismic resilience, treatment plant upgrades, recycled water expansion. Financing:

• Revenue bonds (60%): $2,880 million
• State/Federal grants (15%): $720 million
• WIFIA/SRF (20%): $960 million
• Pay-as-you-go (5%): $240 million

Water rates increased 4–5% annually over the program period. SFPUC's FY2024 reports show Aa2/AA ratings maintenance throughout due to published debt/rate-setting policies and board oversight (SFPUC FY2024 Annual Report). The program included green infrastructure and sustainability components, enabling green bond financing of water recycling portions ($300M+). Final outcome: modernized system with improved resilience and reduced seismic vulnerability.

NYC Department of Environmental Protection: 10-Year Capital Plan ($19.8 Billion, FY2024–2033)

NYC's largest water/sewer capital program includes pipe renewal (40% of budget), treatment facility upgrades (30%), CSO control and green infrastructure (20%), and system expansion/resilience (10%). Financing plan:

Source	Amount	% of Total
Revenue Bonds (Municipal Water Finance Authority)	$12,870 million	65%
State SRF Loans	$3,000 million	15%
Federal Grants (Section 604 State Grant)	$2,400 million	12%
Retained Earnings	$1,530 million	8%

NYC's FY2024–2033 Capital Plan allocates 65% of financing to revenue bonds, consistent with its Aa1/AA+ credit rating (Moody's/S&P, 2025), SRF loans (15%, using state subsidy), federal grants (12%, NYS appropriation advantage), and modest PAYGO (8%). The blend achieves blended cost of debt of approximately 3.0%, reducing capital costs. Planned rate increases (3–4% annually) maintain affordability while funding capital program.

Conclusion

Water infrastructure capital programs address aging system renewal, regulatory compliance, and climate adaptation. The estimated $743.6 billion national infrastructure gap reflects the magnitude of deferred maintenance and emerging regulatory/climate demands. Utilities finance these programs through a blend of revenue bonds (largest source), federal WIFIA loans, state revolving funds (subsidized loans), grants, and retained earnings. Major utilities achieve funding efficiency by strategically combining sources: revenue bonds for scale and market access, WIFIA for large eligible projects at favorable rates, SRF for subsidy benefits, and grants where available. Affordability analysis and rate covenant compliance constrain capital spending pace; utilities may need to balance capital program ambitions with customer affordability and financial sustainability. Utilities such as NYC, SFPUC, DC Water, and LADWP have executed successful multi-billion-dollar capital programs through disciplined rate-setting, efficient funding source deployment, and board oversight. Smaller or lower-rated utilities often face higher borrowing costs and constrained financing access, with capital programs paced by financing access constraints.

Disclaimer

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.