Summary of Tennessee'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.
On this page:
- Technical basis
- Onsite non-potable water reuse applications approved for use in Tennessee
- Water reuse treatment category/type
- Additional context and definitions
- Onsite non-potable reuse specifications (table)
- 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 Tennessee, 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. applications include flushing water closets and urinals. 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 graywater. Graywater includes water received only from bathtubs, showers, lavatories, clothes washers or laundry trays. 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.
Technical basis
Tennessee approves the reuse of graywater for onsite non-potable water reuse applications for flushing water closets and urinals (TPC, 2012). 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. Graywater recycling systems are subject to specifications under the Tennessee Plumbing Code (TPC, 2012). Tennessee requires a permit for the installation or alteration of any plumbing system, including graywater recycling systems (TN Code § 69-3-108). Treatment requirements are applied for the removal of debris, microbial contaminants, chemicals and other relevant indicators related to graywater reuse and are not specified.
Onsite non-potable water reuse applications approved for use in Tennessee
Tennessee (TPC, 2012) approves of these onsite non-potable water reuse applications for recycled graywater:
- Water closet flushing
- Urinal flushing
Additional onsite non-potable water reuse applications for collected graywater are not specified.
Water reuse treatment category/type
Tennessee does not assign recycled graywater used for onsite non-potable water reuse to a category or class. Tennessee requires all graywater entering the collection reservoir of the graywater recycling system to pass through an approved filter such as a sand or diatomaceous earth filter (TPC, 2012). Graywater designated for flushing water closets and urinals must be disinfected by one or more methods that are recommended (e.g., chlorine, iodine or ozone) based on the conditions of the recycling system (TPC, 2012).
Additional context and definitions
Graywater recycling systems may only receive waste discharge from bathtubs, showers, lavatories, clothes washers or laundry trays. The recycling systems must be constructed of nonabsorbent and corrosion-resistant materials (TPC, 2012).
Onsite non-potable water reuse specifications
None.
Upcoming state law or policy
No upcoming regulations pertaining to onsite non-potable applications were found for Tennessee.
References
Clean Water Act, 33 U.S.C. §§ 1251 et seq.
Tennessee Department of Environment and Conservation (TDEC). 2023. ARP Competitive Grant Workshop Series: Water Reuse.
Tennessee Plumbing Code (TPC). 2012. Chapter 13: Gray Water Recycling Systems.
Water Quality Control Act: Permits, TN Code § 69-3-108 (2021).
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.