State Well Codes

To be NSF or ASTM F-480 minimum SDR 26 approved.

All removable casing and existing surface completion to be removed from well & then entire well to be pressure filled by tremie pipe w/ cement from bottom up to land surface. In lieu of previously described plugging procedure with cement, bentonite grout of a minimum of 9.1 lb./gal followed by cement plug extending from surface to depth of at least 2 ft, or if well to be plugged has ≤100 ft. of standing water, it may be filled w/ solid column of 3/8 in. or greater granular sodium bentonite hydrated at frequent intervals while strictly adhering to the manufacturers' recommended rate and method of application. If bentonite grout is used, entire well from ≥2 ft below land surface may be filled w/bentonite grout. Top 2 ft. of well, above bentonite or granular sodium bentonite, to be filled w/ cement. Bentonite grout may not be used if water zone contains chlorides above 1,500 ppm or if hydrocarbons are present. Undesirable water or constituents to be isolated from fresh water zones w/cement plugs and remainder of wellbore filled w/neat cement or clean bentonite grout, followed by cement plug extending from land surface to depth of ≥2 ft. For the purpose of plugging a well, any licensee or landowner can remove the pump.

Well capped and extend 6 inches above land surface. If site conditions dictate that well is better protected below ground surface, upper terminus shall be constructed in the following manner: 1) watertight manhole cover 2) cover lid and skirt to be cast steel or aluminum 3) cover shall have sufficient diameter to use well cap below manhole lid 4) mahole secured by concrete pad 2 inches thick and no less than 24 inches diameter 5) cover shall be equipped w/positive drain to an area where water cannot enter from flooding or runoff could backup to wellhead. Drain may be located in basement of house 6) manhole cover to be clearly marked "water well" 7) construction techniques for casings cut off below ground level shall conform to drawing in Rule 040045-09-10 (7). The upper terminus of the well head shall be capped with a watertight well seal or cap specifically designed for capping the well.

3-10 ft. grout seal. See Grout - General

Pump capacity to be consistent w/ intended use & yield characteristics of well. In installations where the pump is not located directly over the well, the annular space between the casing and pump intake or discharge piping shall be closed with a watertight seal designed specifically for this purpose.

Pitless units or adapters shall comply with WSC's Pitless Adapter Division (PAD) PAS-1 (6th Ed., March 1987) and shall bear the PAD symbol of certification, or otherwise have been approved by the Department. Surface water shall be diverted away from well head so water will not stand around the casing.

All materials used in repair to meet standards for new installation. Must use licensed person. Repairs to wells completed with the top of the well casing terminating below ground shall include extending the well casing above land surface in accordance with subparagraph (5)(a) of Rule 0400-45-09-.10.

>50 ft.

No less than 10 ft. Wells between 10-25 ft from property line shall require minimum of 35 ft of casing installed below land surface w/impervious material such as cement grout or bentonite chips, tablets or bentonite grout backfilled in annular space to depth of 35 ft.

If well construction location area is subject to flooding, must have watertight casing no less than 2 ft above the 100 year flood plain.

>10 ft.

Must pass an exam & be 18 yr. of age. To have min of 2 yr. experience. Pass an examination as prescribed by the Board. Well driller, pump, & water treatment installers to be licensed by state.

May also be quick setting cement in a ratio of no > 6 gal of water per 94 lb. sack of cement.

To be a min of 20% solids & weigh no < 9.2 lb./gallon as measured by a standard mud balance.

Portland Class A cement or quick cement mixed with ≤ 6 gallons of water per 94 lb bag.

Disinfect gravel w/ free chlorine residual of at least 50 ppm. Gravel to be of quartz, granite, or similar rock that is clean, rounded, uniform, & free of clay, silt, & other damaging material. Gravel to be placed in annular space around screens & casing & to have min thickness of at least 1 inch and placed at a minimum o fnineteen ft below land surface. Shall not connect aquifers to reduce water quality or cause significant head loss or depletion of water.

To be equipped w/ fused or circuit breaker disconnect switch. To be served by an entirely separate circuit from other equipment. To meet underwriters specifications & be installed in accordance w/ National Electrical Code.

Develop to remove mud, drilling cutting, or other foreign matter. Correct any damage to aquifer caused during drilling.

May be installed in wells constructed in unconsolidated aquifers provided is new, meet ASTM F-480-88 & bears NSF approval on each section, SDR does not exceed 26, installed after borehole drilled to final depth, and joints to be solvent cement w/ quick-setting cement or threaded & coupled.

Casing constructed in consolidated rock to be seated & sealed below crevices releasing inferior water or mud, or at least 5 ft. below solid bedrock, whichever is greater. Casing in unconsolidated aquifer to extend to at least the top of the aquifer, or to 19 ft. depth, whichever is greater. Casing may have screen attached to bottom or the lowermost feet of casing may be slotted or perforated.if screen/perforated casing at least 20 ft below land surface. Casing to extend from at least 19 ft. below surface to min of 6 in. above land surface. If water obtained from overburden above consolidated rock, casing to be set just above consolidated rock.

Cement grout or bentonite to be placed from 2 ft below land surface to a min of 25 ft. below land surface. Native soil may be used to backfill from land surface to 2 ft below surface, or may use cement or bentonite to land surface. Well bore below 25 ft shal be filled w/either bentonite, cement grout, clean crushed stone of 1/2 inch diameter or less, well cuttings, puddled clay, sand or combo of any of these listed materials. Backfill shall remain level with land surface.

Equipment & materials to be removed from well. Wells to be backfilled & abandoned when casing has not been installed or has been removed w/in 30 days after leaving. Wells to be chlorinated w/ liquid bleach or dry hypochlorite granules to produce free chlorine residual of 25 ppm. Well must be closed by licensed well driller. Alternative methods of filling and sealing may be sumitted to the Director for review and approval.

Positive surface drainage to be provided away from well w/ slope of at least 1/4 in/ft for a distance of 10 ft. To terminate at least 24 in. above ground where flooding may occur. Top of casing or pitless adapter barrel to terminate at least 12 in. above ground surface or pumphouse floor.

To be watertight.

Large capacity pumped wells to have check valves or backflow preventers. the depth of the pump setting shall be determined by dividing the specific capacity into the required yield and adding at least 10 additional feet to maintain pump inlet submergence below the maxim anticipated drawdown. Wells with a pump capacity of more than 18 gallons per minute and a casing size 8 inches or larger must have at least a one-inch threaded hole and a plug at the top of the well that allows measurement of the water level. The pump capacity of a well for which a water permit is required may not be larger than the authorized diversion rate.

To be threaded, compression flange gasketed, or welded to form watertight seal to casing. Top of unit or casing to be capped w/ cover having downward flange overlapping edge of unit or casing.

Gravel pack to be clean material w/o shale or iron pellets. Must no impart taste, odors, toxic substances, or bacterial contamination into well. To be disinfected prior to placement.

500 ft.

1000 ft.

1000 ft.

1000 ft.

10 ft.

500 ft.

500 ft.

Drilling to be performed by licensed well driller.

Bentonite may be added but not to exceed 2 lbs. of bentonite per sack of cement. Up to 7 gal of water to be added per sack of cement when 2 lbs. of bentonite are added. Calcium chloride may be added to the cement grout except when the mixture will be used to grout thermoplastic casing. Water used in making cement grout must be clean and may not contain oil or other organic material. The cement grouting of the well casing must be completed in one continuous operation.

Gravel pack material shall be disinfected before placement must be clean material without shale or iron pellets. The gravel pack material shall be disinfected before being placed in the well or equivalent quantities of chlorine tablets shall be mixed with the gravel pack material and placed in the well.

Develop by surging, jetting, or other approved method. Water to be clear & free of silt, mud, & sand.

Driller to be knowledgeable of ASTM F480-90e. If > 5 in. in diameter, to have min wall thickness of 0.250 in. To meet NSF 14 (1990). Driller shall be knowledgeable of heat hydration and thermoplastic hydraulic collapse pressure limits listed in ASTM Standard F 48090e and "Manual on the Selection and Installation of Thermoplastic Water Well Casing," 1980. When using thermoplastic casing to construct a well, the driller shall install the thermoplastic casing in a manner that does not exceed the casing hydraulic collapse resistance. Solvent cementing procedures shall be as recommended by the casing manufacturer or as stated in the "Manual on the Selection and Installation of Thermoplastic Water Well Casing," 1980. Set times for solvent joints may be shortened by using stainless steel screws in the joints provided the screws do not penetrate to the inside of the casing.

Top to be covered w/ cover having a downward flange which overlaps edge of curbing or casing. Pressure grouting must be completed, or alternatively precast curbing or concrete casing may be terminated 10 ft below ground surface and the terminated casing covered w/concrete or steel cover. Concrete cover to have hole in center formed by pipe 10 inch diameter or less. Annular space and cover joint shall be sealed to no more than 2 ft depth above top of the aquifer or to a depth of 20 ft below grade, whichever is nearest ground surface, by pouring dry granular bentonite into the annular space through a tremie pipe. The space around the pipe extension to the surface shall be filled with bentonite to at least one foot above the cover and with clay or native soil to the ground surface. The pipe extension to the surface and any joints in the pipe must be watertight.

One required near bottom of each size of grouted casing. Required to center casing when it is grouted.

The cover shall be securely fastened to the pitless unit or casing and shall fit sufficiently snug to the unit or casing to be vermin proof. The cover shall be designed to prevent surface contamination. The design of the adapter or unit shall allow access to disinfect the well and access to measure the static and pumping water level in the well.

"Casing installed shall extend a minimum of one foot above the land surface at the time of construction. If an above ground pump is used, the casing may extend less than one foot above the land surface or below the land surface with a protective wellhead cover that allows access to the wellhead if the piping connecting the well casing to the pump is glued or threaded and is watertight."

If a yield test is conducted, it shall be by a standard method and accurately measure flow. Results are to be included in the well record to be sent to the Department.

Wells to be sufficiently plumb & straight so as to cause no interference with intended use.

100 ft.

20 ft.

100 ft.- Includes hazardous waste, surface impoundments, radioactive waste landfills.

50 ft.

R.61-58.B(113)