# Ohio Admin. Code 3745-81-10: Rule 3745-81-10. Maximum residual disinfectant levels

> Ohio · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_10

## Section

- **Citation:** Ohio Admin. Code 3745-81-10
- **Heading:** Rule 3745-81-10. Maximum residual disinfectant levels
- **Jurisdiction:** Ohio
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Ohio Administrative Code / Agency 3745 / Chapter 3745-81 / Rule 3745-81-10

## Text

119.03 (A) Community and nontransient noncommunity public water systems that supply water treated with chlorine or chloramines shall comply with the total chlorine MRDL. (B) Public water systems that treat water with chlorine dioxide shall comply with the chlorine dioxide MRDL. (C) Maximum residual disinfectant levels (MRDLs) are as follows: Disinfectant residual MRDL (mg/l) Total chlorine ................................................. 4.0 (as Cl 2 ). Chlorine dioxide ............................................. 0.8 (as ClO 2 ). (D) The director identifies the following as the best available technology for achieving compliance with the MRDLs identified in paragraph (C) of this rule: control of treatment processes to reduce disinfectant demand and control of disinfection treatment processes to reduce disinfectant levels. Last updated June 25, 2025 at 5:54 PM Supplemental Information Authorized By: 6109.03 , 6109.04 Amplifies: 6109.04 10/31/2029 1/1/2002

## Nearby sections

- [Ohio Admin. Code 3745-81-01 Rule 3745-81-01. Primary drinking water standards definitions](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_01.md)
- [Ohio Admin. Code 3745-81-02 Rule 3745-81-02. Coverage](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_02.md)
- [Ohio Admin. Code 3745-81-03 Rule 3745-81-03. Siting requirements](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_03.md)
- [Ohio Admin. Code 3745-81-04 Rule 3745-81-04. Administrative penalties](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_04.md)
- [Ohio Admin. Code 3745-81-10 Rule 3745-81-10. Maximum residual disinfectant levels](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_10.md)
- [Ohio Admin. Code 3745-81-11 Rule 3745-81-11. Maximum contaminant levels and best available technologies for inorganic contaminants](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_11.md)
- [Ohio Admin. Code 3745-81-12 Rule 3745-81-12. Maximum contaminant levels and best available technologies for organic contaminants](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_12.md)
- [Ohio Admin. Code 3745-81-15 Rule 3745-81-15. Maximum contaminant levels and best available technologies for radionuclide contaminants](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_15.md)
- [Ohio Admin. Code 3745-81-17 Rule 3745-81-17. Treatment techniques](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_17.md)
- [Ohio Admin. Code 3745-81-19 Rule 3745-81-19. Use of bottled water and point-of-use or point-of-entry treatment devices](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_19.md)
- [Ohio Admin. Code 3745-81-23 Rule 3745-81-23. Inorganic chemical monitoring requirements](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_23.md)
- [Ohio Admin. Code 3745-81-24 Rule 3745-81-24. Organic chemical monitoring requirements](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_24.md)
- [Ohio Admin. Code 3745-81-26 Rule 3745-81-26. Radionuclide monitoring requirements](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_26.md)
- [Ohio Admin. Code 3745-81-27 Rule 3745-81-27. Analytical techniques](https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_27.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_OH_ADC_3745_81_10. Check the current official text before relying on it. Not legal advice.