State Well Codes

50 ft.

50 ft.

3 ft.

800 ft.

Piping to be clearly marked with identifying information.

Conform to AWWA A100 Section 7 w/ no>6 gal. of water per pack cement for > 1.5 in openings. Bentonite: same as neat cement or dry granular bentonite shall be maintained around the casing as it is being driven.

To be watertight, vermin-proof, & provide venting.

Shall be installed in an approved pump house, well house, crawlspace, basement offset or basement. Materials must be in compliance with or surpass ANSI/NSF standard 14, 60, or 61, ASTM specification C 150, or section 10 of API specification 10.

Well shall be sufficiently straight and vertical to allow normal installation and operation of the pump.

Shall not be used to suspend grout above an open annular space. Lead packers, lead plugs, or lead wool shall not be used as a well component.

10 ft.

50 ft.

50 ft.

50 ft.

50 ppm free chlorine in all parts of well w/2 hour contact time. For repair, 200 ppm free chlorine during course of repair. Chlorine materials must meet the ANSI/NSF 60-2000e or USEPA (FIFRA), section 3(c)(7)(A), as an antimicrobial pesticide for use in potable water.

ASTM Standard A53/A53M-04a; A589-96 (2001), Types I, II, and III; or API Standard 5L-04. Must have the minimum weights and thicknesses specified in the table in 4725.2350 subpart 2.

Must be watertight and comply with casing standards in part 4725.2350, 4725.2550, or 4725.6650. Threaded joints just have recessed couplings, reamed and drifter couplings, or other couplings that match the design, taper, and thread type of the casing. Thread must not be exposed on pipe when casing is joined. Welded casing, except where approved welding coupling is used, must have beveled joints. Weld must extend the full circumference of the casing and must completely fill the bevel. Welding couplings must be made of material equivalent to casing. Upper and lower welds must extend the full circumference of the casing, and completely fill the gap between the coupling and casing. Welding the casing to the inside of the coupling is prohibited. To connect steel pitless unit or screen to plastic casing, may use fitting or couplings with socket dimensions meeting requirements of ASTM F480-02, and have a water pressure rating of at least 200 psi; schedule 40, slip x internal thread fittings, 4 inch and smaller meeting the requirements of ASTM D2466-02; or schedule 40, slip x internal thread fittings and slip x external thread fittings, 5 inch diameter meeting the requirements of ASTM D2466-02.

Weatherproof and made of metal or plastic installed on inner casing with thickness comparable to casing requirements. Must consist of: overlapping cover or cap; threaded plug, cover or plate; sanitary seal or plug with 1pc top plate, compression gasket, and non corrodible draw bolt. If connection is made to casing less than 12 inches above ground surface, must be watertight, vermin-proof, and be made at or above frost line.

Must be 75 ft. Distance is doubled to 150 ft from a sensitive well. A "Sensitive water-supply well" is defined as a water-supply well with less than 50 feet of watertight casing where the casing does not penetrate a confining layer or multiple layers of confining materials with an aggregate thickness of 10 feet or more.

3 ft.

100 ft from unroofed animal feedlot holding >=300 animal units, 50 ft if feedlot holds more than one animal unit. 50 ft from feeding or watering area. 20 ft if feedlot, confinement area, or kennel holds less than 1 animal unit. Distances are doubled to 200, 100, and 40 ft from a sensitive well. A "Sensitive water-supply well" is defined as a water-supply well with less than 50 feet of watertight casing where the casing does not penetrate a confining layer or multiple layers of confining materials with an aggregate thickness of 10 feet or more.

License required for construction, repair, and sealing of all wells, installation of pump or pumping equipment. Install, modify, or remove a screen, pitless unit, or pitless adapter.

A fluid mixture in the proportion of 94 pounds of Portland cement and not more than six gallons of water. Bentonite up to five percent by weight of cement (4.7 pounds of bentonite per 94 pounds of Portland cement) may be used to reduce shrinkage. Not more than 0.6 additional gallons of water may be added for each one percent of bentonite. Admixtures to reduce permeability or control setting time must meet ASTM Standard C494/C494M-04. The minimum density of neat-cement grout using regular (Type 1) Portland cement without bentonite or entrained air is 15.0 pounds per gallon. The minimum density of regular neat-cement grout with bentonite and without entrained air is:
i. 14.7 pounds per gallon for neat-cement grout and two percent bentonite;
ii. 14.4 pounds per gallon for neat-cement grout and three percent bentonite;
iii. 14.1 pounds per gallon for neat-cement grout and four percent bentonite; and
iv. 13.8 pounds per gallon for neat-cement grout and five percent bentonite.
b. Rapid setting cement. A Type III Portland cement as designated in ASTM Standard C150-04a, an API Class C cement, or any Portland cement containing calcium chloride or sodium chloride in an amount between two and four percent by weight of Portland cement, or gypsum in an amount between 20 and 100 percent by weight of Portland cement.

Mixture of Portland cement, sand and gravel aggregate, and water so that one cubic yard of concrete contains a minimum of 470 lbs (five 94-lb bags) of Portland cement, a maximum of 30 gallons of water, and sand and gravel aggregate passing a one-inch sieve. Admixtures to reduce permeability or control setting time must meet ASTM Standard C494/C494M-04. Allowed only in wells >=16-inch diameter, <200 ft deep, with <20 ft of water.

The top of a gravel pack must terminate at least 15 ft below the established ground surface. Must be mineral material or inert, nontoxic artificial materials, contain < 5% calcareous material & be graded, cleaned, & washed. Must not extend more than 10 ft above static water level or 10 ft above or below screen, through a confining layer in violation of 4725.2020, subpart 1a, or through more than 10 ft of open hole.

Must be 35 ft horizontally from ordinary high water level of a stream, river, pond, storm water retention pond, or lake, does not apply to area protected by flood control structure accepted by FEMA, a wetland, grassed waterway, depression, culvert, or ditch holding water less than 6 months of the year, or an artificial pond holding less than 5,000 gallons of water. 50 ft from industrial cooling pond, gray water dispersal area.

Well must be 20 ft. from storm water drain pipe.

Must be 50 ft. from septic tank, sewage left station, sump. (MN rule, part 4725.4450)

Must be 50 ft. away for wells > 50 ft. deep; must be 100 ft. away for wells < 50 ft. deep. 20 ft from portable privy or toilet.

100 ft from solid manure storage area not covered by a roof, safeguarded area used to store agricultural chemicals, or clean or fill ag chemical application equipment protected with safeguards.

75 ft. Distance is doubled to 150 ft from a sensitive well. A "Sensitive water-supply well" is defined as a water-supply well with less than 50 feet of watertight casing where the casing does not penetrate a confining layer or multiple layers of confining materials with an aggregate thickness of 10 feet or more.

Must be 20 ft. from inground swimming pool.

Must be 150 ft. from an area used to prepare or store more than 25 gallons or 100 lbs. dry weight of hazardous substances. 50 ft from storage area for bulk road deicing chemicals, except that a sensitive well must be at least 100 ft from bulk road deicing chemicals. A "Sensitive water-supply well" is defined as a water-supply well with less than 50 feet of watertight casing where the casing does not penetrate a confining layer or multiple layers of confining materials with an aggregate thickness of 10 feet or more.

Well must be 10 ft. from frost proof yard hydrant.

Must be connected to casing by threaded, solvent-welded or welded joint, or by a nontoxic packer. Lead packers are prohibited.

Required if connection to casing is made less than 12 inches above established ground surface. Must clear I.D. of casing, have all threaded joints watertight with no threads exposed, connect to casing by threaded or welded connection, bolted flange with gasket, clamp and gasket, or compression gasket with materials meeting standards in 4725.2350, 4725.2550, or 4725.6650. Pitless unit using a compression seal must provide for the well casing to extend at least 2.5 inches into the throat of the pitless unit, and compression collar must be held in place with corrosion-resistant bolts, nuts, washers.

If a screen is attached, screen must be attached to the casing by a threaded, solvent-welded, or welded joint or by a non-toxic packer. Lead packers must not be used.

Well must be 50 ft. from sewage sump, or 20 ft from watertight sewage sump with a capacity of less than 100 gallons.

May be joined by solvent weld, mechanical joints, or threaded joints. Thermoplastic pipe & couplings to meet SDR SCH 40 & SCH 80. To have SDR of 26, 21, 17, or 13.5. To meet ASTM standard F480. Casings must be marked. All joints must be watertight.

Recessed or reamed & drifted couplings to be used on threaded casing. To be made by continuous welding, threading, or other approved methods. To be watertight. Tongue & groove type acceptable for concrete.

To equip bottom of driven steel casing.

Caps for wells w/ Pitless Adapters to be have a screened vent hole pointing downward at least 0.5 in. diameter. Hub cap types not approved. Temporary caps not to allow contamination during installation of pumping equipment.

Bentonite or cement grout to be used. All abandoned wells to be plugged through approved methods described in 10 CSR 23-3.110 Plugging of Wells. Contact The Division if there is a question of proper procedure. A permitted well or pump installation contractor must be used to plug the well. A report of the method of plugging shall be filed with the division on a registration report form that is provided by the division.

Must have solids content of at least 20%. Additives to affect viscosity and set-up time are acceptable but must not be a potential contaminant.

Electric wire not to be run through pitless adapter. To be performed well installation contractor or pump installation contractor. To conform to existing electric codes.

Disinfect wells w/ 100 ppm chlorine solution. Min contact tremie of 2 hours before pumping well to waste & flushing chlorine soln. When repairing wells, disinfection to be accomplished w/ a 200 ppm chlorine solution. Caution: The chlorinated water must not leave the owner’s property. If it does, the owner must report to the Water Pollution Control Program, Division of Environmental Quality.

Prohibited unless suitable protective device like break tank or backflow preventor is installed & maintained.

To be new & at least 6 in. nominal size, 13 lb./ft, & 0.188 wall thickness.

300 ft.

100 ft, if well casing is <80 ft in depth and does not encounter at least 10 ft impervious material must be 150 ft.