Environmental Protection
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Air Emissions Inventory (EI) Schedule, Directions, Help and FAQs
Schedule for Calendar Year 2024 EI DataDateBenchmarkJan.
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Historical Air Emissions Information
The DNR first developed its web-based Air Reporting System (ARS) in 1995. Today, more than 1,650 emissions inventories and 600 Under Thresholds Notifications (UTNs) are submitted annually by facilities to the DNR via ARS.
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Annual Air Pollution Fee Structures for Non-Title V Sources Required to Have an Air Permit
There are two levels of annual air pollution fees for businesses that are considered non-Title V sources. A non-Title V source is a business required to have an operation permit, but not a major source permit. There is a separate fee structure for…
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Air Emission Inventory Contacts
Contact the DNR's Air Program for specific questions about emission inventory reporting and software. Facility-Specific Assistance For facility-specific questions, use the Air Permit Search tool. Each facility page in the tool lists a DNR contact…
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Water Quality-Based Effluent Limitations (WQBELs)
Water quality-based effluent limitations are calculated in order to insure that discharges to waters of the state are in compliance with water quality standards. Water quality standards include water quality criteria (such as those in chs. NR 102 […
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Variances to water quality standards
Wastewater discharges to surface water covered under Wisconsin Pollution Discharge Elimination System (WPDES) permits may be subject to water quality-based effluent limits (WQBELs). Under certain circumstances, these WQBELs may not be attainable…
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Statewide Phosphorus Multi-Discharger Variance
Eligibility County resources Implementation -->The multi-discharger variance (MDV) for phosphorus extends the timeline for complying with low-level phosphorus limits.
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Implementation
If a point source meets the eligibility requirements and requests the multi-discharger variance (MDV) for phosphorus, their Wisconsin Pollution Elimination Discharge System (WPDES) permit will, upon approval, be modified or reissued with the…
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Eligibility
Not all point sources are eligible for the multi-discharger variance (MDV) for phosphorus. The following questionnaire may help applicants assess their potential eligibility for this program. The questionnaire does not provide final eligibility…
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County Resources
County participation in the multi-discharger variance (MDV) for phosphorus is completely voluntary. If counties participate, they agree to comply with the requirements of the program to the best of their ability. By participating in the MDV,…