Wisconsin Code § 895.4802

Civil liability exemption; hazardous materials
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(1) In this section:
(a) “Discharge” has the meaning given under s. 292.01 (3).
(b) “Hazardous substance” has the meaning given under s.
299.01 (6).
(c) “Hazardous substance prediction” means any declaration
or estimate of the likely spread or impact of an actual discharge of

a hazardous substance that is based on meteorological, mathematical, computer or similar models.
(d) “Hazardous substance predictor” means any person who
makes a hazardous substance prediction pursuant to a contract or
agreement with a public agency or pursuant to a contract or
agreement with a person who possesses or controls hazardous
substances for the purpose of assisting that person in supplying a
public agency with a hazardous substance prediction in the event
of an actual discharge of a hazardous substance.
(2) Any person is immune from civil liability for his or her
good faith acts or omissions related to assistance or advice which
the person provides relating to an emergency or a potential emergency regarding either of the following:
(a) Mitigating or attempting to mitigate the effects of an actual
or threatened discharge of a hazardous substance.
(b) Preventing or cleaning up or attempting to prevent or clean
up an actual or threatened discharge of a hazardous substance.
(3) The immunity under sub. (2) does not extend to any
person:
(a) Whose act or omission causes in whole or in part the actual or threatened discharge and who would otherwise be liable
for the act or omission;
(b) Who would be liable for the discharge under chs. 281 to
285 or 289 to 299 or any rule promulgated or permit or order issued under chs. 281 to 285 or 289 to 299;
(c) Whose act or omission constitutes gross negligence or involves reckless, wanton or intentional misconduct; or
(d) Who receives or expects to receive compensation, other
than reimbursement for out-of-pocket expenses, for rendering the
advice and assistance.
(4) (a) Any hazardous substance predictor or any person who
provides the technology to enable hazardous substance predictions to be made is immune from civil liability for his or her good
faith acts or omissions in making that prediction or providing that
technology.
(b) The good faith of any hazardous substance predictor or
any person who provides the technology to make a prediction is
presumed in any civil action. Any person who asserts that the
acts or omissions under par. (a) were not made in good faith has
the burden of proving that assertion by clear and convincing
evidence.
(c) The immunity under par. (a) does not extend to any person
described under sub. (3) (a), (b), or (c).

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