Wisconsin Code § 160.255

Exceptions for private on-site wastewater treatment systems
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(1) In this section, “private on-site
wastewater treatment system” has the meaning given in s. 145.01
(12).
(2) Notwithstanding s. 160.19 (1), (2) and (4) (b), a regulatory agency is not required to promulgate or amend rules that define design or management criteria for private on-site wastewater
treatment systems to minimize the amount of nitrate in groundwater or to maintain compliance with the preventive action limit
for nitrate.
(3) Notwithstanding s. 160.19 (3), a regulatory agency may
promulgate rules that define design or management criteria for
private on-site wastewater treatment systems that permit the enforcement standard for nitrate to be attained or exceeded at the
point of standards application.
(4) Notwithstanding s. 160.21, a regulatory agency is not required to promulgate rules that set forth responses that the agency
may take, or require to be taken, when the preventive action limit
or enforcement standard for nitrate is attained or exceeded at the
point of standards application if the source of the nitrate is a private on-site wastewater treatment system.
(5) Notwithstanding ss. 160.23 and 160.25, a regulatory
agency is not required to take any responses for a specific site at
which the preventive action limit or enforcement standard for nitrate is attained or exceeded at the point of standards application
if the source of the nitrate is a private on-site wastewater treatment system.

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