State Well Codes

No Standard Specified.

annular space between old casing & liner to be pressure-grouted entirely. Liner to extend to ground surface or top of pitless adapter. Liners not to be driven into place. Liners to be of steel or thermoplastic w/ a min I.D. of 4 in. Liners to be pressure grouted. Liners to correct a health-related problem, are to have a min of 2 sets of centering guides. Liners to correct problems that are not health-related, to extend at least 20 ft. above static water level. Plastic lines to have SDR of 26 or less or meet SCH 40 or SCH 80. Steel liners to be new & have a min wall thickness of 0.188 in.

No Standard Specified.

Well to be filled with bentonite grout, cement grout, concrete, or puddling clay. Casing may be perforated every 5 ft from bottom to within 5 ft of land surface, perforations must be at least 4 equally spaced per section, and grout must be pressure pumped to fill any voids. Or can fill borehole with approved seal material as casing removed.

Upper casing to terminate & extend at least 12 in. above pump house floor or 100-year flood level.

Coliform bacteria & nitrate levels must be tested by a laboratory between 10-30 days after well is serviced.

No Standard Specified.

License is required if drilled by anyone other than the homeowner.

No Standard Specified.

Access pipes to inject gravel to be installed prior to sealing annular space. Temporary surface casing to be at least 2 in. > permanent casing. Temporary surface casing to reach minimum depth of 18 ft. below land surface.

Pressure to be transmitted through drill string & not to well casing. Shall be performed by licensed well drillers in Idaho.

No Standard Specified.

Maximum sand content produced from a well after initial well development must not exceed 15 ppm. For the purpose of this rule, sand is considered to be any sediment particle retained on a U.S. standard sieve #200 (seventy-five hundredths (0.075) mm to two (2) mm). Production rate must be recorded on well driller's report.

No Standard Specified.

For driven wells with bore having diameter of 3 in. or greater, O.D. to be at least 3 ft. below surface. For dug wells greater than 18 ft. in depth, curbing to extend to depth of 18 ft. or greater. In unconsolidated formations, may extend into clay stratum to min. of 18 ft. below land surface. To be in new or like-new condition & free of pits & breaks, and be plumb and straight. To extend to at least 12 in. above land surface & finished grade to minimum depth below land surface. Unperforated casing to be installed into consolidated formation to depth or to depth of 18 ft. if greater. Unperforated casing to extend 5 ft. below water table if in unconsolidated formations w/o large clay beds.

No Standard Specified.

Responsibility of well owner. Must maintain minimum of 12 inches casing height above land surface and finished grade, maintain well cap, not install pump that would violate the sand production requirements.

100 ft., if drainfield of system with more than 2,500 GPD of sewage inflow min. separation distance is 300 ft.

50 ft.

No Standard Specified.

No Standard Specified.

Surface seals must extend to not less than 38 ft. below land surface for well depths greater than 38 ft. For well depths less than 38 ft or artesian wells, seals must extend to depths as required in Sec 25, Subsection 08 IDAPA 37.03.09. Manufactured packers and shale traps may be used as devices to retain approved seal material, must follow manufacturer's installation recommendations. Bentonite grout not to be used above the water table, unless approved. If a granular bentonite seal is placed deeper than 200 ft, must meet annular space requirements.

No Standard Specified.

No Standard Specified.

No Standard Specified.

Refill pipes to be Schedule 40 steel pipe incorporated within pump foundation. Gravel refill pipes may be installed if they terminate above ground surface and are provided with watertight caps. All gravel placed in the well shall be clean and shall be washed and disinfected prior to placement, or provisions shall be made for disinfection in place.

Only after well effectively cleaned of all remaining drilling mud and cuttings, and after pump installation completed. Sufficient chlorine shall be introduced to give a dosage of 100 parts per million to the water in the well. All gravel placed in the well shall be clean and shall be washed and disinfected prior to placement, or provisions shall be made for disinfection in place. Disinfection instructions available Section 9210.100(b) Finishing and Testing.

ASTM A53/A53M-10, ASTM 589/A589M-06, or API SPEC 5L-2011,and shall conform to Table A.

To be threaded coupling or welded if casing is metal, or solvent welded if casing is plastic. To be watertight. When plastic well casing is installed, the pipe spigot and socket shall be cleaned and treated with a cleaner primer. Other types of plastic joints may be evaluated and approved by the Department on the basis of NSF/ANSI 14-2010a, NSF/ANSI 61-2010a, and laboratory pressurization tests for leakage. A pressurized connection shall be used when steel casing is used to extend plastic casing when the connection is within 20 ft. of the ground surface.

Gaskets for push-on joints to comply to ASTM F477-76. Must be provided with guides. Solvent cement to comply to ASTM D2564-80 (PVC) & F493-80 CPVC. Private Wells see IWWCC 920.90a) Casing intended for construction purposes only shall be of weight and design necessary to be watertight and permit installation without distortion or rupture to the specified depth and shall be removed upon completion of the well. See Section 920 Table A for Steel Casing and Liner Pipe Weights and Dimensions, and Table B for Plastic Casing and Liner Pipe Specifications.

Disinfect with 100 ppm chlorine to water. Individual may make request to seal their own well when it is on their land. Seal with neat cement or bentonite grout. Well to be sealed by licensed water well driller. Well to be sealed within 30 days after abandonment or when it poses a threat. Neat cement grout or bentonite to be applied through tremie pipe, or bailer. Materials to be disinfected. To prevent exchange of water from one aquifer to another. Specifical sealing requirements by formation type IL Water Well Construction Code 920.120 (b).

100 ft.

200 ft.

50 ft.

Must have current Water Well contractors license.

Grout shall be bentonite grout or neat cement grout as described in Section 920.10. Bentonite or similar material may be added to the annular opening in the manner indicated for grouting, prior to the cement grouting, to seal any small crevices or fissures and assure that the annular space is open. The Department will maintain a list of water well grouts on its website. Approved Grouts for Well Casing Annular Space, Well and Borehole Abandonment, and Closed Loop Wells Meeting American National Standards Institute (ANSI)/NSF International (NSF) STD 60. Casing that is to be pressure grouted in the drill hole or annular opening shall be provided with a centering shoe and shall have sufficient guides or centralizers to permit the unobstructed flow and deposition of the thickness of grout specified.

Annular opening to be sealed at top of casing. Diameter of drill hole to be at least 3 in. > O.D. of casing or coupling in unconsolidated forms. Permanent outer casing to extend to at least 20 ft. in unconsolidated forms. See IL. Water Well Construction Code Section 920.60c

A permit to construct, deepen, modify or seal a water well shall be obtained from the Department or approved local health department prior to start of work.

Standard Specified IWWCC Section 920.50

Standard Specified IWWCC Section 920.50

2 ft.

5 ft. New wells shall not be constructed in pits or basements.

All suction pipes are elevated at least 12 inches above the floor. All portions of suction lines buried below the ground surface between the well and the pump shall be enclosed in a pressure discharge line maintained at system pressure.

Upon completion of a new well or modification of an existing well, the contractor shall give the owner information prepared by the Department explaining the importance of water well sampling, procedures for sampling, and how the water can be tested to assure a safe supply of water.

Wells designed for placement of an artificial gravel pack shall be provided with an adequate screen having openings sized on the basis of the grain size of the gravel. The openings shall permit maximum transmitting ability without clogging or jamming. Screens shall be made of non-corrosive material.

The bore of the hole shall be sufficiently plumb and straight to receive the casing without binding. The casing shall be sufficiently plumb and straight so that it will not interfere with installation and operation of the pump.

10 ft. grout plug to be placed opposite the impervious formation or confining layer w/ grout tremie pipe. Entire column to be filled w/ grout. Grout plug of at least 10 ft. to be placed from at least 13 ft. below surface to top of cut off casing. If there is an open bore hole below casing, top 20 ft. of casing to be removed or perforated. Prevent bridging by placing clays, silts, sand, & gravel between plugs. From ground level to 3 ft. below ground level, well shall be backfilled with clean, compacted soil and sloped to direct runoff away from well.

Not Allowed.

Must have current water supply permit. Required Division of Water 28-30-3.

Disinfect wells before first use w/ hypochlorite solution to produce concentration of at least 100 mg/L of available chlorine. Gravel pack, pump, casing, screen, & pump column to be washed w/ 200 mg/L available chlorine solution. Sodium hypochlorite with minimum of 5.25 percent to 6.0 percent strength, names including Clorox, Purex, Sno-White, and Topco, and other bleach products with similar properties, shall be used. All components with potential for contamination to be adequately disinfected during construction, repair, replacement. Drilling fluid shall be initially disinfected by mixing sodium hypochlorite with water to produce at least 100 milligrams per liter (mg/L) of available chlorine.