Weighing WIFIA: How federal loans compare to traditional tax-exempt financing

One such option is the EPA's Water Infrastructure Finance and Innovation Act (WIFIA) program, but the decision to pursue a WIFIA loan is complicated. The right answer depends on a utility's specific circumstances, its credit profile, and the relationship between taxable and tax-exempt interest rates. It is very important to evaluate all the requirements for WIFIA financing relative to your other financing options.

The case for and against WIFIA

WIFIA is designed to accelerate investment in water and wastewater infrastructure by providing federal credit assistance for projects that address regulatory compliance, water quality, drought or flooding, and aging infrastructure. On paper, it is attractive, but six factors make the comparison against traditional tax-exempt bonds complex.

1. WIFIA interest rates are taxable and tied to the State and Local Government Series (SLGS) daily rate, effectively Treasury rates, while traditional revenue bonds are tax-exempt and generally carry lower nominal rates. Investors accept lower yields on tax-exempt debt in exchange for tax savings, which reduces the cost of capital for public issuers.

2. A WIFIA loan carries federal strings. Borrowers must complete a full National Environmental Policy Act (NEPA) review and comply with requirements such as the Endangered Species Act, Davis-Bacon wage rules, the American Iron and Steel requirement, and the Build America, Buy America Act. These obligations can raise project costs.

3. The application itself is long and expensive. The WIFIA process typically runs 6 to 18 months from invitation to closing and demands significant internal staff time, compared with 3 to 6 months for standard bond issuance. The upfront application fee is $100,000, and the credit process fee can add $50,000 to $150,000. Ongoing federal reporting to the EPA adds annual fees of roughly $15,000 to $25,000.

4. WIFIA pricing ignores the borrower's credit. The program prices off the strength of the U.S. government rather than the utility's own rating. For a lower-rated borrower, this can be a meaningful advantage; for a highly rated utility that already commands strong demand in the public market, the benefit shrinks.

5. Generally, WIFIA loans can only amount to 49% of the project funding. Depending on other sources of capital (grants, state revolving fund loans, state appropriations, cash on hand), a WIFIA borrowing may require another borrowing to fully fund the project, which can add to the administrative burden staff is facing.

6. The relationship between tax-exempt and taxable rates shifts over time. A spread that favors bonds today may favor WIFIA next quarter. The best solution is not fixed, which is precisely why a point-in-time analysis must be paired with judgment about flexibility and timing.

Flexibility that bonds rarely match

Where WIFIA truly separates itself is in its structural flexibility. The loan carries no prepayment penalty, so a utility can retire the debt early without paying a premium when cash flow or reserves allow. It permits a single, customized disbursement and repayment schedule tailored to a project's construction timeline, with repayment deferrable until after substantial completion. It also allows re-amortization and cost-effective refinancing if conditions change. For a utility that anticipates shifts in its financial position, rate adjustments, growth in its customer base, or future opportunities to accelerate debt retirement, this flexibility carries real value. It serves as risk mitigation, giving management room to respond to conditions that are difficult to predict at closing. Traditional bonds, by contrast, lock in a fixed structure with call provisions that limit early repayment and often impose costs to unwind.

The rate and cost advantage

WIFIA's other main appeal is its cost of capital. Because the loan rate is pegged to comparable-maturity Treasury securities at closing, it can closely compete with, and sometimes beat, the all-in yield a utility would secure in the public market.  

During a recent analysis for a client who is already required to comply with federal rules (outlined below) and has a bond rating in the “A” range, the two pathways yield broadly comparable overall costs, which is why the decision turns on factors beyond the headline rate.  

Public bonds can deliver very competitive rates in a favorable market but expose the issuer to timing risk: rates can move before pricing, and a utility has limited control over the market on any given day. WIFIA's more predictable rate structure insulates borrowers during the lengthy application process, which is valuable for large, long-horizon projects.

[[CTA:subscribe]]

The real trade-off: Effort and compliance

WIFIA’s advantages come with meaningful obligations. Its application process is more burdensome than a standard bond issue, requiring NEPA review and compliance with additional federal rules. For utilities already using federal grants, these requirements may add little incremental burden because the utility may already be complying with these rules due to the requirements of federal grants.  For utilities without federal funding, they create new work and cost. The larger differentiator is staff time. WIFIA can take 6 to 18 months from invitation to closing and requires sustained coordination, data collection, consultant management, and reporting. By contrast, public bond issuance typically takes 3 to 6 months and focuses mainly on disclosure and legal review. Utilities must assess whether they can manage WIFIA’s ongoing compliance obligations.

Making the decision

WIFIA is not categorically better than tax-exempt bonds. Though its competitive rate, absence of prepayment penalties, customizable structure, and rate predictability make it compelling for many projects, particularly where the utility already faces federal compliance or values long-term flexibility. Additionally, WIFIA is very competitive for borrowers with a weaker credit profile, where the value of leveraging the U.S. Treasury’s credit strength is used to set the rate on the financing.  

The right answer depends on project size, existing funding sources, internal capacity, and a utility's appetite for flexibility versus simplicity. A disciplined, side-by-side analysis of the cost of capital, and the full set of program requirements is the only reliable way to determine the best fit for your organization, and that is the kind of evaluation Raftelis is built to support.

‍

This article was authored in part by our intern Max Cowan, as part of our Raftelis Internship Program. Max is in his junior year at Fordham University in New York, majoring in Finance.

‍