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Congres&onal Research Se
Informing     legi I live d MI ~ in o 914


Updated February 14, 2025


The Hazardous Substance Superfund Trust Fund


Decades of industrial and commercial activities involving
various chemicals resulted in environmental contamination
at thousands of sites in the United States, including federal
facilities that served national defense and other purposes.
Some  of this contamination occurred prior to environmental
regulation. Allocation of financial responsibility for
remediating environmental contamination has been a long-
standing issue. At the federal level, the Comprehensive
Environmental Response, Compensation, and Liability Act
of 1980 (CERCLA;   P.L. 96-510) established the liability of
certain categories of potentially responsible parties (PRPs)
for the costs of remediating hazardous substances released
into the environment, natural resource damages, and related
federal public health studies. CERCLA authorized the
Hazardous Substance Superfund Trust Fund to finance the
remediation of sites without financially viable PRPs to
fulfill their liability. The U.S. Environmental Protection
Agency  (EPA) administers and oversees the remediation of
sites prioritized for federal involvement under the
Superfund program, in coordination with the states in which
the sites are located. Other federal laws apply to oil spills
and petroleum contamination from underground tanks not
covered under CERCLA.   States also have established
environmental remediation programs under their own laws.

Under CERCLA and subsequent law,   Congress established
a three-part tax system to finance the Superfund Trust
Fund: (1) an excise tax on crude oil and imported petroleum
products, (2) an excise tax on certain domestic chemical
feedstocks and imported chemical derivatives, and (3) a
special environmental tax on corporate income. These taxes
accounted for most of the receipts for the Superfund Trust
Fund until the taxing authority expired at the end of 1995.
Since the taxes expired, the Superfund Trust Fund was
primarily financed with transfers from the General Fund of
the U.S. Treasury until Congress reauthorized two of the
taxes in the 117th Congress.

Enacted November  15, 2021, Section 80201 of Title II of
Division H of the Infrastructure Investment and Jobs Act
(P.L. 117-58) reauthorized the Superfund chemicals excise
tax through December 31, 2031, at double the rates that
were in effect in 1995. Additionally, Section 13601 in Part
6 of Subtitle D of Title I of P.L. 117-169, known as the
Inflation Reduction Act, permanently reauthorized the
Superfund petroleum excise tax, increased the rate, and
provided for annual inflation adjustments. The effective
dates for these tax provisions are July 1, 2022, and January
1, 2023, for P.L. 117-58 and P.L. 117-169, respectively.

Superfund Tax H story
As enacted in 1980, CERCLA  authorized Superfund excise
taxes on crude oil, imported petroleum products, and
domestic chemical feedstocks. Congress chose 42


feedstocks from which many other chemicals were made, as
a matter of efficiency to tax chemical production. The
Superfund Amendments   and Reauthorization Act of 1986
(P.L. 99-499) expanded the Superfund chemicals excise tax
to include imported chemical derivatives and added the
special environmental tax on corporate income. Congress
based the excise taxes on the premise that petrochemicals
from crude oil, and other commercial chemicals, were
common   sources of contamination. The tax on corporate
income applied to any corporation that met the income
threshold regardless of whether its activities involved
hazardous substances. Subsequent laws through the 101st
Congress reauthorized Superfund taxes until the end of
1995. Prior to expiration, Superfund taxes were an excise
tax on crude oil and imported petroleum products at a rate
of 9.7 cents per barrel paid by U.S. refineries receiving
crude oil and importers of petroleum products for
consumption, use, or warehousing; an excise tax on 42
chemical feedstocks paid by the manufacturers, and
imported chemical derivatives paid by the importers, at a
rate that varied from $0.22 per ton to $4.87 per ton
depending on the substance; and a special environmental
tax on corporate income at the rate of 0.12% of alternative
minimum   taxable income in excess of $2 million annually.

Superfund tax receipts were fully expended by the end of
FY2003.  General Fund transfers have since financed most
of the annual appropriations from the Superfund Trust
Fund. In addition to these transfers, the Superfund Trust
Fund receives revenue from cost recoveries from PRPs,
fines and penalties for violations of CERCLA, and interest
on the balance of the trust fund. The Tax Increase
Prevention Act of 2014 (P.L. 113-295) repealed the expired
Superfund special environmental tax on corporate income.

Eligible   Uses   of Receipts
Taxes and other receipts in the Superfund Trust Fund have
been subject to annual appropriations prior to expenditure.
Section 111 of CERCLA   authorizes eligible uses of
appropriated receipts from the Superfund Trust Fund to
remediate contaminated sites. Section 111 excludes federal
facilities from eligible uses of receipts because Congress
funds their remediation with separate appropriations. The
Internal Revenue Code (26 U.S.C. §9507) excludes natural
resource damages from eligible uses of receipts to focus
appropriations on remediation, but these damages remain
subject to liability under CERCLA. The expenditure of
Superfund appropriations for CERCLA  remedial actions
is limited to National Priorities List (NPL) sites on
nonfederal land, subject to cost-sharing with the state in
which the site is located. Less extensive removal actions
may be fully funded with Superfund appropriations at NPL
or non-NPL  sites. Monies that EPA collects from PRPs
under CERCLA   settlements are held in site-specific

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