Environmental Protection
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Outdoor wood boilers
Outdoor wood boilers (OWBs) have become more popular in the United States, particularly in rural areas, as the prices for heating oil, propane and natural gas have increased. A 2006 report by Northeast States for Coordinated Air Use Management (…
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Know before you burn
The DNR's air quality and waste management rules generally prohibit open burning, with some limited exceptions. The tabs below provide information about the types of burning that may be allowed under state regulations. You can also use the "Can I…
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Alternatives To Burning
Before burning anything, always consider alternatives. Open burning of materials other than clean wood and some yard waste is prohibited. In addition, outdoor burning of anything generates smoke and air pollution and is the number one cause of…
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Air Emissions Inventory (EI) Schedule, Directions, Help and FAQs
Schedule for Calendar Year 2023 EI Data Date Benchmark Jan.
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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. In exchange, point sources commit to step-wise reductions of phosphorus…