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Ohio Laws and Rules
All private water systems using continuous disinfection shall conform to the requirements of this rule.
(A) Private water systems using ponds, springs, or cisterns constructed in compliance with this chapter shall be provided with continuous disinfection, as provided in this rule. Wells that have been determined to be contaminated with bacteria shall only be required to be provided with continuous disinfection if the construction of the well is known to be in compliance with this chapter and the aquifer is suspected of being bacteriologically contaminated.
(B) Where continuous disinfection is required pursuant to this chapter the means of disinfection shall be measurable and it shall conform to the following requirements:
(1) All chemical disinfectants shall be readily available;
(2) The residual of the chemical disinfectant shall be measurable by the user; and
(3) Ultraviolet light disinfection system dosage shall be measured as microwatts per second per centimeter squared.
(C) Disinfectants shall be applied prior to the water storage tank or retention tank to obtain the contact time required for the specific disinfectant used.
(D) If chlorination is the means of disinfection, it shall conform to the following requirements:
(1) Sufficient chlorine shall be added to satisfy the demand;
(2) The Ct value (contact time multiplied by the free chlorine residual) for disinfection shall be four; and
(3) The free chlorine residual in the water piping system shall be at least two-tenths milligram per liter.
(E) If an ultraviolet light system is used as the primary means of disinfection it shall meet all of the requirements of ANSI/NSF standard fifty-five for class A ultraviolet light treatment systems. Ultraviolet light systems that meet only ANSI/NSF standard fifty-five class B shall not be used for continuous disinfection of private water systems. An ultraviolet light system used as the primary means of disinfection shall also meet the following criteria:
(a) It shall be installed after any equipment used to soften the water or to remove iron or manganese;
(b) An absolute filter size of one to two microns shall be installed prior to treatment of the water by the ultraviolet equipment.
(c) Where a private water system provides water to more than one service connection, and ultraviolet is used as the primary means of disinfection, then continuous disinfection shall be installed to maintain a chlorine residual of at least two-tenths milligrams per liter in the water distribution lines.
(F) If iodination is the means of disinfection, it shall conform to the following requirements:
(1) Sufficient iodine shall be added to satisfy the demand;
(2) The Ct value (contact time multiplied by the free iodine residual) for disinfection shall be ten; and
(3) The free iodine residual in the water piping system shall be between five-tenths and one milligram per liter.
(G) If ozonation is the means of disinfection it shall conform to the following requirements:
(1) Sufficient ozone shall be added to satisfy the demand and the Ct value shall be no less than 0.6 at pH seven and five degrees celsius (Ct equals residual ozone concentration multiplied by the contact time);
(2) Ozone must have a minimum detectable residual of 0.1 milligram per unit after six minutes of contact;
(3) Ozone generators shall have air drawn through the system under a vacuum in order to prevent ozone gas leakage into the house;
(4) Ozone generators shall have air flow meters installed before the ozone generation chamber to insure proper air flow and to help detect down stream injection tubing cracks or breaks;
(5) All ozone generation chambers shall be constructed of stainless steel or of a material of equivalent resistance to destruction from ozone;
(6) Ozone generators shall have corona arc indicating lights;
(7) Gas injection tubing, gaskets, valves, and sealants shall be of material that resists the strong oxidation potential of ozone such as stainless steel and teflon or equivalent materials. The piping material between the ozone injection point and the filter shall be chemical resistant ozone injection tubing;
(8) Ozone injectors should consist of chemical resistant venturi nozzles; and
(9) All ozonation systems shall have an ozone destruction unit or a gas collector and shall be vented to the outside.
(H) For private water systems required to be installed with continuous disinfection and not utilizing chlorination or iodination as the primary means of disinfection the entire plumbing and distribution systems shall be disinfected with a chlorine solution of at least one thousand milligrams per liter prior to being placed into service.
(I) Disinfectants other than ozone, ultraviolet, chlorine or iodine may be used only if approval for the special device is obtained in writing from the director of health. The director shall not approve any device which does not ensure the protection of the health of the persons served by that system.
(J) An owner of a private water system that has continuous disinfection shall maintain a test kit or appropriate testing equipment to determine the free chlorine, iodine or ozone residual in the water after continuous disinfection has occurred and shall periodically test the treated water to determine the presence of at least two-tenths milligram per liter chlorine, five-tenths milligram per liter iodine, one-tenth milligram per unit of ozone, as applicable.
R.C. 119.032 review dates: 12/23/2004 and 11/15/2009
Promulgated Under: 119.03
Statutory Authority: 3701.344
Rule Amplifies: 3701.344
Prior Effective Dates: 1/1/1981, 1/1/00