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County of Los Angeles
Department of Public Health
Environmental Health
5050 Commerce Drive
Baldwin Park, CA 91706
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Non-Production Wells

Monitoring Wells

Monitoring wells are constructed to observe conditions at defined or required locations. Monitoring well locations are selected on the basis of known or expected hydrologic, geologic, and water quality conditions and the location of pollutant or contaminant sources. Monitoring wells frequently need to be located close to or within areas of pollution or contamination.

Cathodic Protection Well

Means any artificial excavation in excess of 50 feet constructed by any method for the purpose of installing equipment or facilities for the protection electrically of metallic equipment in contact with the ground, commonly referred to as cathodic protection.

Geothermal Heat Exchange Well

Means any uncased artificial excavation, by any method, that uses the heat exchange capacity of the earth for heating and cooling, in which excavation the ambient ground temperature is 30 degrees Celsius (86 degrees Fahrenheit) or less, and which excavation uses a closed loop fluid system to prevent the discharge or escape of its fluid into surrounding aquifers or other geologic formations. Geothermal heat exchange wells include ground source heat pump wells.

Test Wells (Hole)

Means wells constructed to obtain information needed for design of other wells. Test wells should not be confused with "exploration holes", which are temporary. Test wells are cased and can be converted to other uses such as groundwater monitoring and, under certain circumstances, to production wells.

Recharge, Injection or Air Conditioning Wells

Wells constructed to introduce water into the ground as a means of replenishing groundwater basins, repelling the intrusion of seawater, disposing of wastewater, or returning to the groundwater which has been used as a coolant in air conditioning processes. These wells are constructed under the jurisdiction of Regional Water Quality Control Boards under the authority of the California Water Code and California Public Resources Code. They also include "dry" wells, "drainage" wells and "sewer" wells.

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Director of Environmental Health
Liza Frias
Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.
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