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An individual water supply shall be located and constructed so as to be safeguarded against contamination in accordance with Sections 608.18.1 through 608.18.8.
608.18.1 Well Locations
A potable ground water source or pump suction line shall not be located closer to potential sources of contamination than the distances shown in Table 608.18.1. In the event the underlying rock structure is limestone or fragmented shale, the local or state health department shall be consulted on well site location. The distances in Table 608.18.1 constitute minimum separation and shall be increased in areas of creviced rock or limestone, or where the direction of movement of the ground water is from sources of contamination toward the well.
TABLE 608.18.1
DISTANCE FROM CONTAMINATION TO PRIVATE WATER SUPPLIES AND PUMP SUCTION LINES
SOURCE OF CONTAMINATION DISTANCE (feet)
Barnyard 100
Farm silo 25
Pasture 100
Pumphouse floor drain of cast iron draining to ground surface 2
Seepage pits 50
Septic tank 25
Sewer 10
Subsurface disposal fields 50
Subsurface pits 50
For SI: 1 foot = 304.8 mm.
608.18.2 Elevation
Well sites shall be positively drained and shall be at higher elevations than potential sources of contamination.
608.18.3 Depth
Private potable well supplies shall not be developed from a water table less than 10 feet (3048 mm) below the ground surface.
608.18.4 Watertight Casings
Each well shall be provided with a watertight casing extending to not less than 10 feet (3048 mm) below the ground surface. Casings shall extend not less than 6 inches (152 mm) above the well platform. Casings shall be large enough to permit installation of a separate drop pipe. Casings shall be sealed at the bottom in an impermeable stratum or extend several feet (mm) into the water-bearing stratum.
608.18.5 Drilled or Driven Well Casings
Drilled or driven well casings shall be of steel or other approved material. Where drilled wells extend into a rock formation, the well casing shall extend to and set firmly in the formation. The annular space between the earth and the outside of the casing shall be filled with cement grout to a depth of not less than 10 feet (3048 mm) below the ground surface. In an instance of casing to rock installation, the grout shall extend to the rock surface.
608.18.6 Dug or Bored Well Casings
Dug or bored well casings shall be of watertight concrete, tile or galvanized or corrugated metal pipe extending to not less than 10 feet (3048 mm) below the ground surface. Where the water table is more than 10 feet (3048 mm) below the ground surface, the watertight casing shall extend below the table surface. Well casings for dug wells or bored wells constructed with sections of concrete, tile or galvanized or corrugated metal pipe shall be surrounded by 6 inches (152 mm) of grout poured into the hole between the outside of the casing and the ground and extending not less than 10 feet (3048 mm) below the ground surface.
608.18.7 Cover
Potable water wells shall be equipped with an overlapping watertight cover at the top of the well casing or pipe sleeve such that contaminated water or other substances are prevented from entering the well through the annular opening at the top of the well casing, wall or pipe sleeve. Covers shall extend downward not less than 2 inches (51 mm) over the outside of the well casing or wall. A dug well cover shall be provided with a pipe sleeve permitting the withdrawal of the pump suction pipe, cylinder or jet body without disturbing the cover. Where pump sections or discharge pipes enter or leave a well through the side of the casing, the circle of contact shall be watertight.
608.18.8 Drainage
Potable water wells and springs shall be constructed such that surface drainage will be diverted away from the well or spring.

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