Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 815 - Injection Wells
Subchapter II - Injection Well Classes and Underground Sources of Drinking Water
Section NR 815.04 - Classification of injection wells
Universal Citation: WI Admin Code ยง NR 815.04
Current through August 26, 2024
Injection wells are classified as follows:
(1) CLASS I INJECTION WELL. A class I well is any of the following:
(a) A well used for
underground injection of a fluid classified as a hazardous waste or a fluid
containing any substance classified as a hazardous waste below the lowermost
formation containing an underground source of drinking water.
(b) A well used for underground injection of
a fluid containing an industrial or municipal waste below the lowermost
formation containing an underground source of drinking water.
(c) A well used for underground injection of
a fluid containing a radioactive waste below the lowermost formation containing
an underground source of drinking water.
(2) CLASS II INJECTION WELL. A class II well is any of the following:
(a) A well used for
underground injection of a fluid that was brought to the surface in connection
with activities that are related to the conventional production of oil or
natural gas, or the underground storage of natural gas, that may be commingled
with wastewater that is produced during production operations, except for any
wastewater that is classified as a hazardous waste at the time of
injection.
(b) A well used for
enhanced recovery of oil or natural gas.
(c) A well used for storage of hydrocarbons
that are liquid at standard temperature and pressure.
(3) CLASS III INJECTION WELL. A class III well is a well used for solution mining of minerals including, but is not limited to:
(a) A well used to mine sulfur by
the Frasch process.
(b) A well used
for in-situ production of uranium or other metals from ore bodies that have not
been conventionally mined.
Note: A well used for solution mining of conventional mines, such as stopes leaching, is classified as a class V injection well.
(c) A well used for
solution mining of salts or potash.
(4) CLASS IV INJECTION WELL. A class IV well is any of the following:
(a) A well used for
underground injection of a hazardous waste or radioactive waste or a fluid
containing a hazardous waste or radioactive waste into a formation that
contains an underground source of drinking water.
(b) A well used for underground injection of
hazardous waste or radioactive waste or a fluid containing a hazardous waste or
radioactive waste above a formation which contains an underground source of
drinking water.
(5) CLASS V INJECTION WELL. Any well used for underground injection that is not classifiable as a class I, II, III or IV injection well.
Disclaimer: These regulations may not be the most recent version. Wisconsin may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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