Wisconsin Administrative Code
Department of Natural Resources
NR 800 - Environmental Protection - Water Supply
Chapter NR 812 - Well Construction And Pump Installation
Subchapter II - New Water Well and Heat Exchange Drillhole Construction and Reconstruction and Filling and Sealing of Wells and Drillholes
Section NR 812.21 - Liners

Universal Citation: WI Admin Code § NR 812.21

Current through August 26, 2024

A well driller or well constructor shall install a liner in accordance with all of the following requirements:

(1) LINERS INSTALLED TO CORRECT CONTAMINATION . Any liner installed to address a water supply with contaminant levels in excess of the standards specified in s. NR 812.06 or to prevent cross-migration between aquifers shall be grouted in place using the procedures under sub. (5).

(2) PIPE MATERIAL. Pipe used to line a well shall meet the requirements specified in s. NR 812.11(6) or (7). Ungrouted steel liner pipe may have a lesser wall thickness than is required in Table B for the diameter of well casing pipe but shall have a wall thickness of at least 0.216 inches.

(3) DIAMETER OF PIPE. Liner pipe shall be the largest practical diameter allowing installation in the well. When a liner is grouted in place, it shall have a nominal diameter at least 2 inches smaller than the nominal diameter of the permanent well casing pipe or the diameter of the drillhole.

(4) LINER INSTALLATION. Liner pipe shall extend at least 10 feet above the static water level or packers shall be installed far enough above and below the caving zone to prevent further entrance of material into the well. When the liner pipe does not extend to the bottom of the well, the liner pipe shall be supported on the bottom and top with a pipe flange or packer installed between the outside of the liner and the inside of the drillhole.

(5) GROUTING PROCEDURES. A well driller or well constructor shall grout a liner to meet all of the following requirements:

(a) The liner pipe shall be centered within the drillhole and casing during grouting.

(b) When the liner pipe does not extend to the bottom of the well, a flange or approved packer shall be provided at the bottom of the liner between the outside of the liner and the inside of the drillhole or the inside of the well casing pipe, or the liner shall rest on backfill material to be later drilled or bailed out.

(c) The liner pipe shall extend to the ground surface or shall extend at least to the bottom of the pitless adapter when one is used.

(d) The liner pipe shall be completely sealed in place from the bottom of the liner to the top of the liner with neat cement grout using a pressure grouting method according to the grouting requirements specified in s. NR 812.20. The liner shall be supported until the grout has set.

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