Ohio Administrative Code
Title 3745 - Ohio Environmental Protection Agency
Chapter 3745-9 - Water Well Standards
Section 3745-9-04 - Well siting
Current through all regulations passed and filed through December 16, 2024
(A) Public water system and nonpotable wells as defined in rule 3745-9-01 of the Administrative Code shall be located in accordance with the following:
(B) In addition to paragraph (A) of this rule, a public water system well shall meet the following:
[Comment: The director recommends ownership by the public water system of land at least within the sanitary isolation radius.]
Sanitary Isolation Radius
Estimated Average Daily Water Demand (Q gallons per day) |
Sanitary Isolation Radius (feet) |
0 - 2500 |
50 |
2501 - 10,000 |
square root of Q |
10,001 - 50,000 |
50 + Q/200 |
Over 50,000 |
300 |
[Comment: An owner or operator of a public water system that proposes to locate a well in a one hundred year floodplain or floodway must also obtain approval from state or local floodplain management agencies as appropriate.]
(C) In addition to paragraphs (A) and (B) of this rule, a public water system well used by a community or nontransient noncommunity public water system shall be located such that the following are not located within the proposed well's inner management zone:
(D) In instances where a proposed public water system well cannot be feasibly located such that the conditions specified in paragraphs (B)(2), (B)(6), (B)(7), and (C) of this rule are met, the director may grant a variance in accordance with paragraph (F) of rule 3745-9-02 of the Administrative Code. The applicant shall make an adequate demonstration that documents the site hydrogeology, engineering controls, or other physical barriers are sufficient to minimize the risk of contamination being drawn into the well.
(E) The director may require a hydrogeologic investigation to select the location of a well to ensure that contaminants will not be drawn into the well and that a sufficient quantity of ground water exists for the intended purpose. These investigations may be required where, without limitation, one of these well siting circumstances exist: potential or known contamination; hydrogeologic setting that may allow transport of contaminants; or initial development of a community well field. The investigation shall be conducted by a qualified ground water professional. A hydrogeological investigation is a study of the subsurface and geologic conditions. Information shall be collected, without limitation, about the type and thickness of geologic materials, the occurrence of ground water, how it flows in pore spaces and fractures, and the quantity and quality of the ground water.