State Well Codes

Remove all obstructions, if unable to remove, fill cavity with approved fill materials from bottom of well to point above obstruction. If this is not possible, 5-ft non-slurry bentonite grout plug must be placed. Avoid bridging. Only use approved fill material or grout material including disinfected sand, gravel or crushed stone, native earth material may be used in large diameter bored or dug wells, All must be free of potentially toxic chemical residue and foreign materials. Disinfectant equivalent to 200 ppm chlorine in liquid, granular, or pellet for before filler material. Must have upper plug of either non-slurry bentonite or sand cement grouts. See 178 NAC 12-012.07 for approved methods.

Wells must be vented to allow air to enter and leave the well freely with the changing of water level in the well. A breather tube shall be installed and terminate in a full 180 degree bend at least 18 inches above the floor, securely screened with 16 mesh wire screen. If the breather tube or a depth gauge line passes through the base of the pump or through the seal connection into the well, the hole about the tube shall be sealed.

A sanitary well seal shall be installed at top of well casing to prevent entrance of contamination.

The discharge line must meet standards for ferrous or nonferrous well casing, have an expanding, watertight rubber seal between it and the casing, unless fitted with a pitless unit or pitless adapter. Discharge line shall leave well at top of casing and be watertight. Underground discharge requires a pitless unit or adapter. Electrical cable shall be attached to pump at riser at intervals of 20 ft or less. When check valve is not part of the pump, it shall be installed on pump discharge line within the well, but not required for nonpressurized wells for livestock use that would be damaged by freezing when airgap or other cross-connection control protection is provided.

A separate pump column, suction, or discharge pipe shall be installed in all wells.

May be located in a basement if the pumps and suction pipes are at least twelve inches above the floor.

Every well shall be tested for plumbness and alignment and shall be sufficiently plumb to not interfere with installation and operation of the pump.

Unit: Must meet standards of the National Sanitation Foundation or the Water Systems Council. Must be factory fabricated, form an unbroken extension form point of discharge to above ground level, have I.D. equal or greater than I.D. of casing, conduct water from casing without contamination, have access to casing for disinfection, be capped with a vermin-proof, watertight cover having a downward flange which overlaps the unit, but must allow for watertight entrance of cables, vent piping, and air line or tap. To be installed by threaded, welded or compression flange gasketed connection to the cutoff casing, and connection must be watertight. If connection to casing to a field weld, factory-assembled unit must be designed specifically for field welding. All field connections between pitless unit and water service pipe to be threaded, flanged or mechanical joint. Adapter: Must be installed according to manufacturer specifications and meet NSF standards. Must be constructed and installed to prevent contamination, provide adequate clearance for insertion and withdrawal of pump and system components through upper terminal, connected to casing with clamps-and-gasket or welding, and be watertight. Upper terminal must have pitless cap or cover specified for pitless units. All field connections must be threaded, flanged, or mechanical joint, and all other aspects of pitless adapter must be as specified for pitless units.

Shall be of a material that will not impart taste, odors, toxic substances, or bacterial contamination to the water in the well.

Minimum distance in unconsolidated soils 50 ft.

All wells must be accessible for repair, cleaning, testing, etc. No wells may be constructed in any basement, pit, room, or other space below ground surface. Greater distances are always preferable and often necessary, depending upon soil conditions. When wells are constructed in consolidated formations, care must be taken in locating the wells as pollutants have traveled great distances in such formations.

When a well must be located adjacent to a building, it shall be located so that the centerline of the well extended vertically will clear any projection from the building by not less than 2 ft.

Minimum distance in unconsolidated soils 50 ft.

The certified water well contractor, water well pump and pitless installer in charge shall provide inspection and supervision of all water well construction activities, installation of water well pumps, pitless units, or other appurtenances, or both.

A mixture of at least three pounds commercially prepared high solids bentonite clay per gallon of water may be used to seal water wells. Use of bentonite drilling fluid as grouting material is not allowed.

A sufficient number of guides must be used to allow unobstructed flow and uniform thickness of grout.

Grout materials must be positively and accurately placed to fill all voids, filling from bottom upwards, to obtain at least one and one-half inches of grout around the casing. Bentonite chips or tablets may be added from the top of the well, to a maximum depth of thirty feet, provided there are no voids, and they are hydrated after placement.

Every new, modified, or reconditioned water source shall be thoroughly cleaned and disinfected after the completion of construction and again after the permanent pump is installed. Disinfection to be completed with strong chlorine solution of 50-100 mg/L.

All well discharging to potential source of contamination must be provided with an approved backflow prevention device or airgap to prevent backflow or siphonage. Backflow specifications are in North Dakota State Plumbing code.

≤ 10 inch diam. - ASTM schedule 40, > 10 inch diam. - 0.375 inch minimum wall thickness

All abandoned wells shall be sealed by restoring as far as possible the controlling geological conditions which existed before the wells were drilled.

Shall enter into well at least 12 inches above land surface, except where pitless adapters or pitless units are used.

If water is from unconsolidated formation, shall be equipped with a screen. Multi-screen wells shall not connect aquifers or zones which have differences in water quality to prevent contamination.

Permit required to be obtained from Department prior to construction.

50 ft. if constructed to water main standards in accordance with 15A NCAC 02T .0305(g)(2) or 15A NCAC 18A .1950(e), as applicable, no less than 25 ft for exceptions. Other sewage and liquid-waste collection or transfer facility 100 ft.

100 ft.

At least 10 ft. of continuous grouting within first 20 ft below ground surface or alternate method approved by the Dept. Watertight cement grout, sealing clay, bentonite or equivalent material approved by the Dept.

No Standard Specified.

No Standard Specified.

No Standard Specified.

At least 10 ft. in all directions from well, surface must be sloped to drain away from well. Driller's log, maps, and photos must be submitted to Dept. No cross-connection with sewer system. Well must be protected against flooding. Well pits are prohibited unless they are exempted by Dept. Water well contractors are required to submit the well drilling log to DNR.

50% cement, 50% aggregate. To be grouted to 20 ft. The upper 20 feet of the
hole diameter shall be at least 4-inch larger than the O.D. of the concrete
casing.

Casing may be driven, lowered, or installed in any manner which will affect a continuous watertight installation. In those wells where there is an annulus, it shall be filled with puddled clay and/or cement grout in the manner prescribed in Rule .06 (a) (1).

Notify Department 14 days prior to reconditioning any well by blasting.

Abandoned wells & boreholes to be filled to prevent contamination. Fill with neat cement or in accordance with AWWA Standards. Top 20 ft. must be sealed with neat cement and no material that could impart taste, odor, or toxic components to water may be used in the sealing process.

No Standard Specified.

No Standard Specified.

No Standard Specified.

No Standard Specified.

100 ft. minimum separation distance, includes lift station and sewer cleanout. The Dept. has the discretion to require a greater separation distance.

75 ft. minimum separation distance. The Dept. has the discretion to require a greater separation distance.

All wells should be above 100 yr. flood plain.

At least 150 ft. away

Must have at least 2 years of experience under a licensed well driller and make a minimum score of 70 percent on a Board authorized examination prior to being licensed.

Flow in continuous operation until annular space is filled & overflowing. In wells > 100 ft., grout to be no < 100 ft. from surface to end of grout zone. Minimum annular space to be 3 in. Non-community wells to be grouted as above or by tremie pipe. Pressure cement grout. To be added at the bottom of outer casing & under pressure. see regulation 335-7-5-.13

1. Contamination may occur. 2. Total coliform of raw water > 20 per 100 mL but is < 100 per 100 mL for 4 consecutive months. 3. Avg. fecal coliform count of raw water > 5 per 100 mL but is < 20 per 100 mL for 4 months. Chlorine concentration time of at least 60 to be used when turbidity is < 5 NTU and: Residual for chlorine to be no < 0.2 mg/L free chlorine. Should a disinfectant other than chlorine be used, an equivalent CT time will be provided by the Department.

Wells shall be thoroughly developed to remove all sand, cuttings and drilling fluids from the well and aquifer. The permanent pumping equipment may not be used to develop a well.

Drill cuttings to be obtained at 10 foot intervals & all pronounced changes in formations. Submit cuttings to geologist. See Statutory Authority: Code of Alabama 1975, 22-24-8

Shall be watertight welded or threaded couplings.

Grouting guides to be welded to casing. Temporary casing shall be of sufficient strength to prevent rupture. Must be watertight and permit installation without distortion or rupture.