Ohio Administrative Code

(A) Public water systems shall not use bottled water to achieve compliance with the requirements of this chapter. Upon approval of the director, bottled water may be used on a temporary basis to avoid an increased risk to health from contaminant levels exceeding the maximum conta…

All public water systems shall monitor as described in paragraphs (B) and (C) of this rule to determine compliance with the maximum contaminant levels (MCLs) for nitrate and nitrite. In addition, all community water systems and all nontransient noncommunity water systems shall mo…

Monitoring requirements for organic chemical contaminants of drinking water are stated in this rule. Analytical procedures which are acceptable for monitoring for organic contaminants in drinking water are referenced in rule 3745-81-27 of the Administrative Code. Analyses under t…

Community public water systems shall monitor as described in this rule to determine compliance with the maximum contaminant levels (MCLs) for radionuclides listed in rule 3745-81-15 of the Administrative Code. Analytical procedures which are acceptable for monitoring of radionucl…

Analyte analyses conducted to determine compliance with Chapters 3745-81, 3745-82, and 3745-83 of the Administrative Code shall be performed by a laboratory certified by the director pursuant to Chapter 3745-89 of the Administrative Code unless otherwise specified and shall be ma…

Analytical results for the purpose of determining compliance with this chapter may be considered only if the results have been determined and reported by a laboratory certified by or otherwise acceptable to the director under Chapter 3745-89 of the Administrative Code, except tha…

When a public water system supplies water to one or more other public water systems, the director may modify the monitoring requirements imposed by this chapter to the extent that the interconnection of the systems justifies treating them as a single system for monitoring purpose…

(A) Except where a different reporting period is specified in this chapter or in rule 3745-89-08 of the Administrative Code, the public water system is responsible for ensuring that the results of a test, measurement, or analysis required to be made by this chapter are reported t…

(A) General requirements for public notification by public water systems.(1) The owner or operator of a public water system shall provide public notice to persons served by that public water system in accordance with this rule. Public water systems that sell or otherwise provide …

Any owner or operator of a public water system subject to the provisions of this chapter shall retain on the premises or at a convenient location near the premises the following records:(A) Records of microbiological and turbidity analyses made pursuant to this chapter shall be k…

Applicability. This rule applies to all public water systems that use ground water except those that combine all of their ground water with surface water or with ground water under the direct influence of surface water prior to treatment under rule 3745-81-71 of the Administrativ…

(A) Triggered source water monitoring.(1) A ground water system shall conduct triggered source water monitoring if the conditions identified in paragraphs (A)(1)(a) and (A)(1)(b) of this rule exist.(a) The system does not provide at least 4-log treatment of viruses (using inactiv…

(A) Compliance monitoring.(1) A ground water system that is not required to meet the source water monitoring requirements of rule 3745-81-42 of the Administrative Code because the system provides at least 4-log treatment of viruses (using inactivation, removal, or a director-appr…

(A) A ground water system with a significant deficiency is in violation of the treatment technique requirement if the system does not comply with the corrective action requirements and schedule established under rule 3745-81-61 of the Administrative Code.(B) Unless the director i…

(A) Reporting. In addition to the requirements in rule 3745-81-31 of the Administrative Code, a ground water system regulated under rules 3745-81-41 to 3745-81-45 and rule 3745-81-60 or 3745-81-61 of the Administrative Code shall provide the following information to the director:…

(A) The director may determine that a public water system shall apply best available technology in order to reduce the level of a contaminant to below its maximum contaminant level (MCL). The director identifies the following as the best available technology for achieving complia…

(A) All public water systems shall conduct routine total coliform monitoring in accordance with this rule.(1) Following any total coliform-positive sample collected in accordance with paragraph (B), (C), (D) or (E) of this rule, public water systems shall comply with the repeat m…

(A) Repeat monitoring.(1) When a sample collected in accordance with rule 3745-81-51 of the Administrative Code is total coliform-positive, the public water system shall monitor with a set of three repeat samples within twenty-four hours of being notified of the positive result. …

(A) Public water systems shall conduct assessments in accordance with paragraph (B) of this rule after exceeding any of the following treatment technique triggers:(1) Level one treatment technique triggers.(a) For a public water system which monitors with at least forty samples p…

(A) Maximum contaminant level (MCL) for Escherichia coli (E. coli). A public water system in violation of the MCL for E. coli as a result of any of the following conditions shall notify the public using tier 1 notification requirements in accordance with rule 3745-81-32 of the Ad…

(A) Reporting.(1) Escherichia coli (E. coli).(a) A public water system shall notify the director by the end of the day when the system learns of an E. coli maximum contaminant level violation, unless the system learns of the violation after the director's office is closed, in whi…

(A) Community water systems must undergo a sanitary survey at least every three years. Noncommunity water systems must undergo a sanitary survey at least every five years. The director shall review the results of each sanitary survey to determine whether the existing monitoring f…

A significant deficiency, as defined in rule 3745-81-01 of the Administrative Code, may be identified any time a qualifying condition exists at a public water system. The primary means for identifying significant deficiencies are a sanitary survey conducted in accordance with rul…

(A) The requirements of rules 3745-81-64 to 3745-81-69 of the Administrative Code are derived from national primary drinking water regulations. This rule establishes or extends treatment technique requirements in lieu of maximum contaminant levels for Cryptosporidium and are in a…

(A) Initial round of source water monitoring.(1) Systems serving at least ten thousand people shall sample their source water for Cryptosporidium, E. coli, and turbidity at least monthly for twenty-four months.(2) Systems serving less than ten thousand people shall sample their s…

(A) Reporting source water monitoring results.(1) Systems shall report results from the source water monitoring required by paragraphs (A) to (G) of rule 3745-81-65 of the Administrative Code no later than ten days after the end of the first month following the month when the sam…

(A) Following completion of the initial round of source water monitoring required by paragraph (A) of rule 3745-81-65 of the Administrative Code, systems shall calculate an initial Cryptosporidium bin concentration for each plant for which monitoring was required. Calculation of …

(A) Water systems shall obtain plan approval by the director for each microbial toolbox option prior to receiving treatment credit for the toolbox option. Systems receive the treatment credits listed in the following table by meeting the conditions for microbial toolbox options d…

(A) Reporting requirements.(1) Systems shall report sampling schedules in accordance with paragraph (I) of rule 3745-81-65 of the Administrative Code and source water monitoring results in accordance with paragraph (A) of rule 3745-81-66 of the Administrative Code unless they not…

(A) Each public water system required to monitor under this rule shall develop and implement a monitoring plan. The public water system shall maintain the plan and make the plan available for inspection by the director and the general public. All surface water systems serving mor…

(A) Rules 3745-81-71 to 3745-81-75 of the Administrative Code are derived from national primary drinking water regulations. The treatment technique requirements of this rule are established in lieu of maximum contaminant levels for the following contaminants: Cryptosporidium, Gia…

19.03 This rule was filed with the Legislative Service Commission in PDF format and is presented here as filed. View Rule Text View Appendix Last updated July 31, 2026 at 6:42 AM Authorized By: 6109.04 Amplifies: 6109.03, 6109.04 Five Year Review Date: 8/7/2030 Prior Effective Da…

A public water system that uses a surface water source, in whole or in part, shall provide treatment consisting of both disinfection, as specified in paragraph (B) of rule 3745-81-72 of the Administrative Code, and filtration treatment which complies with paragraph (A), (B), or (…

A public water system that uses a surface water source, in whole or in part, shall conduct turbidity and disinfection monitoring in accordance with this rule.(A) Turbidity measurements to ensure compliance with rule 3745-81-73 of the Administrative Code shall be performed on repr…

A public water system that uses a surface water source shall report monthly to the director the information specified in paragraphs (A) to (F) of this rule. In addition, a public water system that monitors for TTHM, HAA5, bromate, chlorite, total residual chlorine, chlorine dioxi…

(A) Source water which is open to the atmosphere or subject to surface runoff is designated as surface water. Surface water sources include streams, rivers, ponds, lakes, reservoirs, springs, roof collection and impoundments.(B) Source water which is obtained from a well is desig…

(A) Surface water community and nontransient noncommunity public water systems using conventional filtration treatment shall operate with enhanced coagulation or enhanced softening to achieve the TOC per cent removal levels specified in paragraph (F) of this rule unless the syste…

A surface water system that uses conventional filtration treatment or direct filtration treatment and that recycles spent filter backwash water, thickener supernatant, or liquid from a dewatering process shall meet the following:(A) Surface water systems shall notify the director…

(A) Applicability. The requirements of rules 3745-81-80 to 3745-81-90 of the Administrative Code are based on the national primary drinking water regulations for lead and copper. Unless otherwise indicated, each of the provisions of these rules applies to community water systems …

(A) Public water systems shall complete the applicable corrosion control treatment requirements described in rule 3745-81-82 of the Administrative Code by the deadlines established in this rule.(1) A large system (serving more than fifty thousand persons) shall complete the corro…

Each public water system shall complete the corrosion control treatment requirements described below which are applicable to such system under rule 3745-81-81 of the Administrative Code.(A) Small public water system recommendation regarding corrosion control treatment. Based upon…

Public water systems shall complete the applicable source water at the entry point to the distribution system monitoring and treatment requirements (described in the referenced portions of paragraph (B) of this rule and in rules 3745-81-86 and 3745-81-88 of the Administrative Cod…

All water systems that replace lead service lines, replace water mains in areas that contain or are likely to contain lead service lines, or exceed the lead action level after the implementation of corrosion control or source water treatment shall comply with all applicable requi…

All public water systems collecting tap water samples in accordance with rule 3745-81-86 of the Administrative Code shall comply with all applicable requirements in this rule.(A) Consumer notice of results.A water system shall complete all applicable notice requirements in this r…

(A) Sample site location and mapping requirements.(1) Each public water system shall complete a materials evaluation of the distribution system in order to identify a pool of targeted sampling sites that meets the requirements of this rule and is sufficiently large to ensure that…

All large public water systems shall monitor water quality parameters in addition to lead and copper in accordance with this rule. All small and medium public water systems that exceed the lead or copper action level shall monitor water quality parameters in addition to lead and …

(A) Sampling point locations, collection methods, and number of samples.(1) A public water system that exceeds the lead or copper action level on the basis of tap water samples collected in accordance with rule 3745-81-86 of the Administrative Code shall monitor for lead and copp…