Wis. Admin. Code NR § 815.09
No injection well may be operated in a manner that fails to comply with ch. 160, Stats., or results in endangerment of an underground source of drinking water.
Note: Section 160.19(4), Stats., specifies that if a state regulatory agency promulgates a rule that is designed to maintain compliance with a preventive action limit and if a preventive action limit is attained or exceeded at a point of standards application, the agency shall review its rule and, if necessary, revise the rule to maintain compliance with the preventive action limit. If an enforcement standard is attained or exceeded at a point of standards application, the agency shall review its rule and, if necessary, revise the rule to ensure that the enforcement standard is not attained or exceeded at a point of standards application or other locations in the future.
Wis. Admin. Code Department of Natural Resources § NR 815.09
Endangerment, as it applies to Class V injection wells that are not prohibited under subchapter III, is any exceedance of an enforcement standard established under ch. 160, Stats., when measured at a point of standards application as defined in s. 160.01(5), Stats.