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  2. Water Reuse

Summary of Oklahoma's Water Reuse Guideline or Regulation for Onsite Non-potable Water Reuse

This page is part of the EPA’s REUSExplorer tool, which summarizes the different state level regulations or guidelines for water reuse for a variety of sources and end-uses.
The source water for this summary is Onsite Collected Waters.

REUSExplorer Links
  • REUSExplorer home page
  • News in reuse regulations
  • Maps of states with water reuse regulations or guidelines

On this page:

  • Technical basis
  • Types of onsite non-potable reuse approved for use in Oklahoma
  • Water reuse category/type
  • Additional context and definitions
  • Onsite non-potable reuse specifications
  • Upcoming state law or policy
  • References
  • Disclaimer

This page is a summary of the state’s water reuse law or policy and is provided for informational purposes only. Please always refer to the state for the most accurate and updated information. 

In Oklahoma,  onsite non-potable water reuse The use of treated onsite collected waters for non-potable purposes at the single-building or district scale. This reuse application excludes the use of recycled water from a centralized treatment and distribution system for landscape irrigation or commercial uses. include gardening and composting, among others. The source of water onsite collected waters Water sources generated within or surrounding a building, residence, or district. Other terms referring to this source of water include onsite collected stormwater or rainwater, greywater, blackwater, air conditioning condensate, and foundation water. is specified by the state as private residential gray water. The write-up uses state terms when discussing sources or uses of water that may differ from the Regulations and End-Use Specifications Explorer's (REUSExplorer's) terms.

Check out Oklahoma's other onsite non-potable water reuse summary!

State requirements for water quality and treatment are often associated with the source water. Oklahoma has an onsite non-potable water reuse summary page where the source water is rainwater collected onsite.

Technical basis

Oklahoma approves the use of “private residential gray water” originating from a residence for household gardening, composting or landscape irrigation (Okla. Stat. tit. 27A, § 2-6-108). All applicable provisions of the Clean Water Act (CWA) (33 U.S.C. §§ 1251 et seq.), including its implementing regulations, must be met in addition to any state water quality standards. Oklahoma does not require a permit for applying <250 gallons per day of private residential gray water if several criteria are met, such as the gray water: (1) is not sprayed; (2) it is sited outside of a floodway; (3) it is applied in a manner that minimizes contact with people or domestic pets; and (4) it is not discharged to a waterway (Okla. Stat. tit. 27A, § 2-6-108). The technical basis for gray water regulation is not explicitly specified.

Types of onsite non-potable reuse approved for use in Oklahoma

Okla. Stat. tit. 27A, § 2-6-108 defines the following approved onsite non-potable uses of “private residential gray water”:

  • Household gardening, 
  • Composting,
  • Landscape irrigation. 

Water reuse category/type

Oklahoma does not assign gray water used for onsite non-potable reuse to a category or class.

Additional context and definitions

Oklahoma defines gray water as “untreated household wastewater that has not come in contact with toilet waste and includes wastewater from bathtubs, showers, washbasins, clothes washing machines and laundry tubs” (Okla. Stat. tit. 27A, § 2-6-107). Gray water excludes “wastewater from kitchen sinks, kitchen dishwashers or laundry water from the washing of material soiled with human excreta, such as diapers” (Okla. Stat. tit. 27A, § 2-6-107). 

Onsite non-potable reuse specifications

Oklahoma does not have additional fit-for-purpose specifications for onsite non-potable reuse of private residential gray water.

Upcoming state law or policy

No upcoming onsite non-potable reuse regulations were found for Oklahoma.

References:

Application of Private Residential Gray Water for Household Gardening, Composting, or Landscape Irrigation, Okla. Stat. tit. 27A, § 2-6-108.

Clean Water Act, 33 U.S.C. §§ 1251 et seq.

“Gray Water” Defined – Certain Exceptions to Permits for Reuse, Okla. Stat. tit. 27A, § 2-6-107.


Disclaimers

Disclaimers

The Regulations and End-Use Specifications Explorer (REUSExplorer) is intended to be a synthesis of state laws and policies governing water reuse across the US for informational purposes only. These summaries are not legally binding and do not replace or modify any state or federal laws. In the case of any conflict between these summaries and a state or federal law, the state or federal law governs. Numeric and other types of water reuse standards and specification regulations are included in these summaries, but not necessarily all relevant state laws. It is possible a state law authorizes types of water reuse, while no reuse standards and/or specification regulations have been adopted.

Inclusion/Exclusion Criteria

References were included if they could be categorized as either an act, standard, regulation, criteria, guideline, guidance document, technical manual, or appendix issued by a government, standards organization (e.g., ISO, NSF/ANSI), professional association (e.g., AWWA, IWA), research sponsor (e.g., WERF, WRF), or expert committee (e.g., National Academies) and considered to be active or adopted. References were excluded if they indicated that a state approved reuse projects on a case-by-case basis only; contained no water quality specifications or requirements; and/or focused on land disposal of both water and biosolids rather than a specific reuse application.

Please contact us at waterreuse@epa.gov if the information on this page needs updating or if this state is updating or planning to update its laws and policies and we have not included that information on the news page.

Contact Us to ask a question, provide feedback, or report a problem.
Last updated on August 18, 2024
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