Wisconsin Statutes Environmental Regulation (Ch. 280 to 299) § 285.87. Penalties for violations relating to air pollution

(2)(a) Except as provided in par. (b), any person who intentionally commits an act that violates, or fails to perform an act required by this chapter, except s. 285.59, or any rule promulgated, any permit issued or any special order issued under this chapter, except s. 285.59, shall be fined not more than $25,000 per day of violation or imprisoned for not more than 6 months or both.

(b) If the conviction under par. (a) is for a violation committed after another conviction under par. (a), the person is guilty of a Class I felony, except that, notwithstanding the maximum fine specified in s. 939.50(3)(i), the person may be fined not more than $50,000 per day of violation.