Wis. Admin. Code Department of Natural Resources NR 815.04

Current through September 30, 2024

Section NR 815.04 - Classification of injection wells

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.

Wis. Admin. Code Department of Natural Resources NR 815.04

CR 01-104: cr. Register October 2004 No. 586, eff. 11-1-04.