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 Texas Greywater Code: Texas Commission on Environmental Quality

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From: http://www.tceq.state.tx.us/assets/public/legal/rules/rules/pdflib/210f.pdf

Chapter 210 - Use of Reclaimed Water
SUBCHAPTER F: USE OF GRAYWATER SYSTEMS 210.81 - 210.85
Effective January 6, 2005 210.81. Applicability.

(a) This subchapter applies to graywater used for irrigation and other agricultural purposes; for domestic use; for commercial purposes; for industrial purposes; and for institutional purposes.
(b) Reclaimed water use is regulated by Subchapters A - E of this chapter (relating to General Provisions; General Requirements for the Production, Conveyance, and Use of Reclaimed Water; Quality Criteria and Specific Uses for Reclaimed Water; Alternative and Pre-Existing Reclaimed Water Systems; and Special Requirements for Use of Industrial Reclaimed Water).
(c) For the purpose of this subchapter, the term “Site” has the same meaning as defined in Chapter 305, Subchapter A of this title (relating to General Provisions).
Adopted December 15, 2004  Effective January 6, 2005 210.82.
General Requirements.
        (a) Graywater is defined as wastewater from:
                (1) showers;
                (2) bathtubs;
                (3) handwashing lavatories;
                (4) sinks that are not used for disposal of hazardous or toxic ingredients;
                (5) sinks not used for food preparation or disposal; and
                (6) clothes-washing machines.
        (b) Graywater does not include wastewater from the washing of material, including diapers, soiled with human excreta or wastewater that has come into contact with toilet waste.
        (c) Construction of a graywater system, including storage and disposal systems, must comply with this chapter and any requirements of the local permitting authority.

 Criteria for the  Domestic Use of Graywater. Texas Commission on Environmental Quality          

Chapter 210 - Use of Reclaimed Water
          (a) An authorization is not required for the domestic use of less than 400 gallons of graywater each day if:
                 (1) the graywater originates from a private residence;
                 (2) the graywater system is designed so that 100% of the graywater can be diverted to an organized wastewater collection system during periods of non-use of the graywater system and the discharge from the graywater system must enter the organized wastewater system through two backwater valves or backwater preventers;
                 (3) the graywater is stored in tanks and the tanks:
                          (A) are clearly labeled as nonpotable water;
                          (B) must restrict access, especially to children;
                          (C) eliminate habitat for mosquitoes and other vectors;
                          (D) are able to be cleaned; and
                          (E) meet the structural requirements of 210.25(i) of this title (relating to Special Design Criteria for Reclaimed Water Systems);
                 (4) the graywater system uses piping that meets the piping requirement of 210.25 of this title;
                 (5) the graywater is applied at a rate that:
                          (A) will not result in ponding or pooling; or
                          (B) will not cause runoff across the property lines or onto any paved surface; and
                 (6) the graywater is not disposed of using a spray distribution system.
          (b) Builders of private residences are encouraged to:
                 (1) install plumbing in new housing to collect graywater from all allowable sources; and
                 (2) design and install a subsurface graywater system around the foundation of new housing to minimize foundation movement or cracking.
          (c) A graywater system as described in subsection (a) of this section may only be used:
Texas Commission on Environmental Quality                                                           
Chapter 210 - Use of Reclaimed Water
                  (1) around the foundation of new housing to minimize foundation movement or cracking;
                  (2) for gardening;
                  (3) for composting; or
                  (4) for landscaping at the private residence.
         (d) The graywater system must not create a nuisance or damage the quality of surface water or groundwater.
         (e) Homeowners who have been disposing wastewater from residential clothes-washing machines, otherwise known as laundry graywater, directly onto the ground before the effective date of this rule may continue disposing under the following conditions.
                  (1) The disposal area must not create a public health nuisance.
                  (2) Surface ponding must not occur in the disposal area.
                  (3) The disposal area must support plant growth or be sodded with vegetative cover.
                  (4) The disposal area must have limited access and use by residents and pets.
                  (5) Laundry graywater that has been in contact with human or animal waste must not be disposed onto the ground surface.
                  (6) Laundry graywater must not be disposed to an area where the soil is wet.
                  (7) A lint trap must be affixed to the end of the discharge line.
         (f) Graywater systems that are altered, create a nuisance, or discharge graywater from any source other than clothes-washing machines are not authorized to discharge graywater under subsection
(e) of this section.

Criteria for Use of Graywater for Industrial, Commercial, or Institutional Purposes.
         (a) Authorization. If used in accordance with this subchapter, graywater used for an industrial,
commercial, or institutional purpose does not require authorization from the commission.
         (b) Graywater systems used for industrial, commercial, or institutional purposes must be designed so that 100% of the graywater can be diverted to an organized wastewater collection system during periods of non-use of the graywater system. The discharge from the graywater system must enter the organized wastewater system through two backwater valves or backwater preventers.
         (c) Graywater, as defined in 210.82(a) of this title (relating to General Requirements), may be
used for the following activities.
                 (1) Process water.
                         (A) Graywater used for industrial, commercial, or institutional purposes must be treated to a standard that allows the graywater to be used in operational processes.
                         (B) Treatment described in subparagraph (A) of this paragraph does not require an authorization from the agency.
                 (2) Landscape maintenance. If graywater is used for landscape maintenance, the graywater must meet the following standards.
                         (A) If the graywater will be applied in areas where the public may come into contact with the graywater, the graywater must meet the following standards:
                                  (i) Fecal coliform, 20 colony forming units (CFU)/100 mililiters (ml), geometric mean; or
                                  (ii) Fecal coliform (not to exceed), 75 CFU/100 ml, single grab sample.
                         (B) If the graywater will be applied in areas where the public is not present during the time when irrigation activities occur or disposed of for other uses where the public would not come into contact with the graywater, the graywater must meet the following standards:
                                  (i) Fecal coliform, 200 CFU/100 ml, geometric mean; or
                                  (ii) Fecal coliform (not to exceed), 800 CFU/100 ml, single grab sample.
                 (3) Dust control. If graywater is used for dust control, the graywater must meet the standards in paragraph (2)(B) of this subsection.
                 (4) Toilet flushing. If graywater is used for toilet flushing:
                         (A) the fecal coliform levels must meet the limits in paragraph (2)(A) of this subsection; and
                         (B) all exposed piping and piping carrying graywater within a building must be either purple pipe or painted purple; all buried piping installed after the effective date of these rules must be either manufactured in purple, painted purple, taped with purple metallic tape, or bagged in purple; and all exposed piping must be stenciled in white with a warning reading “NON-POTABLE WATER.”
                 (5) Other uses. If graywater is used for other similar activities where the potential for unintentional human exposure may occur, the graywater must meet the fecal coliform limits in paragraph (2)(A) of this subsection.
         (d) Graywater used for commercial, industrial, or institutional purposes must be monitored for fecal coliform at least monthly in areas where the public may come into contact with graywater and these records must be maintained at the site. These records must be readily available for inspection by
the commission for a minimum of five years.

210.85. Criteria for Use of Graywater for Irrigation and for Other Agricultural Purposes.
         (a) If used in accordance with this subchapter, graywater used for irrigation and other
agricultural purposes does not require authorization from the commission.
         (b) Graywater systems used for irrigation and other agricultural purposes must be designed so that 100% of the graywater can be diverted to an organized wastewater collection system during periods of non-use of the graywater system. The discharge from the graywater system must enter the organized wastewater system through two backwater valves or backwater preventers.
         (c) Graywater, as defined in 210.82(a) of this title (relating to General Requirements), may be used for the following activities.
                 (1) Process water.
                          (A) Graywater used for irrigation and other agricultural purposes may be treated to a standard that allows the graywater to be used in operational processes.
                          (B) Treatment described in subparagraph (A) of this paragraph does not require an authorization from the commission.
                 (2) Landscape maintenance. If graywater is used for landscape maintenance, the graywater must meet the following standards.
                          (A) If the graywater will be applied in areas where the public may come into contact with the graywater, the graywater must meet the following standards:
                                  (i) Fecal coliform, 20 colony forming units (CFU)/100 mililiters (ml), geometric mean; or
                                  (ii) Fecal coliform (not to exceed), 75 CFU/100 ml, single grab sample.
                         (B) If the graywater will be applied in areas where the public is not present during the time when irrigation activities occur or disposed of for other uses where the public would not come into contact with the graywater, the graywater must meet the following standards:
                                 (i) Fecal coliform, 200 CFU/100 ml, geometric mean; or
                                 (ii) Fecal coliform, 800 CFU/100 ml, single grab sample.
                (3) Dust control. If graywater is used for dust control, the graywater must meet the standards in paragraph (2)(B) of this subsection.
                (4) Irrigation of fields. If graywater is used to irrigate fields where edible crops are grown or fields that are pastures for milking animals, the graywater must meet the standards in paragraph (2)(A) of this subsection.
                (5) Other uses. If graywater is used for other similar activities where the potential for unintentional human exposure may occur, the graywater must meet the fecal coliform limits in paragraph (2)(A) of this subsection.
        (d) Graywater used for irrigation and for other agricultural purposes must be monitored for fecal coliform at least monthly in areas where the public may come into contact with graywater and the records must be maintained at the site. These records must be readily available for inspection by the commission for a minimum period of five years.

 SUBCHAPTER H: DISPOSAL OF GRAYWATER

From http://www.tceq.state.tx.us/assets/public/legal/rules/rules/pdflib/285h.pdf                                          
 285.80, 285.81
                                       Effective January 6, 2005
285.80. General Requirements.
        (a) Graywater is defined as wastewater from:
                (1) showers;
                (2) bathtubs;
                (3) handwashing lavatories;
                (4) sinks that are not used for disposal of hazardous or toxic ingredients;
                (5) sinks that are not used for food preparation or disposal; and
                (6) clothes-washing machines.
        (b) Graywater does not include wastewater from the washing of material, including diapers, soiled with human excreta or wastewater that has come in contact with toilet waste.
        (c) Construction of a graywater system, including storage and disposal systems, must comply with this chapter and any more stringent requirements of the local permitting authority. For the purposes of this subchapter, a graywater system begins at the graywater stub-out of a single family dwelling.

Adopted December 15, 2004   Effective January 6, 2005
285.81. Criteria for Disposal of Graywater.
        (a) Permits and inspections are not required for the domestic use of less than 400 gallons of graywater each day if:
                (1) the graywater originates from a single family dwelling;
                (2) the graywater system is designed so that 100% of the graywater can be diverted to the owner’s on-site sewage facility (OSSF) system during periods of non-use of the graywater system. A graywater system may only be connected to the OSSF system if the following requirements are met.
                        (A) The connection must be in the line between the house stub-out for the OSSF and the OSSF treatment tank.                                                          
                          (B) The discharge from the graywater system must enter the OSSF system through two backwater valves or backwater preventers;
                 (3) the graywater is stored in tanks and the tanks:
                          (A) are clearly labeled as nonpotable water;
                          (B) restrict access, especially to children;
                          (C) eliminate habitat for mosquitoes and other vectors;
                          (D) are able to be cleaned; and
                          (E) meet the structural requirements of the 2004 American Water Works Association standards;
                 (4) the graywater system uses piping clearly identified as a nonpotable water conduit, including identification through the use of painted purple pipe, purple pipe, pipe taped with purple metallic tape, or other methods approved by the commission;
                 (5) the graywater is applied at a rate that will not result in ponding or pooling or will
not cause runoff across the property lines or onto any paved surface; and
                 (6) the graywater is not disposed of using a spray distribution system.
        (b) No reduction in the size of the OSSF system will be allowed when using a graywater system.
        (c) Builders of single family dwellings are encouraged to:
                 (1) install plumbing in new housing to collect graywater from all allowable sources; and
                 (2) design and install a subsurface graywater system around the foundation of new housing to minimize foundation movement or cracking.
        (d) Graywater from a graywater system as described in subsection (a) of this section may only be used:
                 (1) around the foundation of new housing to minimize foundation movement or cracking;
                 (2) for gardening;
                 (3) for composting; or
                  (4) for landscaping at a single family dwelling.
         (e) All aspects of the permitting, planning, construction, operation, and maintenance for any proposed graywater system that does not meet the requirements of subsection (a) of this section must meet the requirements of the remainder of this chapter.
         (f) The installer of the graywater system must advise the owner of basic operating and maintenance procedures including any effects on the OSSF system.
         (g) Graywater use must not create a nuisance or damage the quality of surface water or groundwater. If graywater use creates a nuisance or damages the quality of surface water or groundwater, the permitting authority may take action under 285.71 of this title (relating to Authorized Agent Enforcement of OSSFs).
         (h) Homeowners who have been discharging wastewater from residential clothes-washing machines, otherwise known as laundry graywater, directly onto the ground prior to the effective date of this rule, may continue this discharge under the following conditions.
                  (1) The disposal area shall not create a public health nuisance.
                  (2) Surface ponding shall not occur in the disposal area.
                  (3) The disposal area shall support plant growth or be sodded with vegetative cover.
                  (4) The disposal area shall have limited access and use by residents and pets.
                  (5) Laundry graywater that has been in contact with human or animal waste shall not be discharged on the ground surface and shall be treated and disposed of according to 285.32 and
                  (6) Laundry graywater shall not be discharged to an area where the soil is wet.
                  (7) The use of detergents that contain a significant amount of phosphorus, sodium, or boron should be avoided.
                  (8) A lint trap shall be required at the end of the discharge line.
         (i) Graywater systems that are altered, create a nuisance, or discharge graywater from any source other than clothes-washing machines are not authorized to discharge graywater under subsection
(h) of this section.