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Storm Water

How to Survive a WDNR Storm Water Audit

How to Survive a WDNR Storm Water Audit

The Wisconsin Department of Natural Resources (WDNR) has restructured the municipal storm water (MS4) permit program. Discussions between the U.S. Environmental Protection Agency (EPA) and WDNR in 2016 led to a goal of 35 MS4 audits per year out of 245 MS4 permitted communities statewide. This goal will result in most communities being audited during the 5-year MS4 permit term. Notification of an upcoming audit is typically given shortly before WDNR staff plan on visiting (approximately 2 weeks).