Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 290 - PUBLIC DRINKING WATER › Subchapter F - DRINKING WATER STANDARDS GOVERNING DRINKING WATER QUALITY AND REPORTING REQUIREMENTS FOR PUBLIC WATER SYSTEM › Section 290.116 - Groundwater Corrective Actions and Treatment Techniques

Current through Reg. 49, No. 28; July 12, 2024
(a) Applicability. All public water systems
				  that use groundwater, except public water systems that combine all of their
				  groundwater with surface water or with groundwater under the direct influence
				  of surface water prior to treatment as described in §
										290.111
				  of this title (relating to Surface Water Treatment), must comply with one or
				  more of the treatment techniques and corrective actions of this section if a
				  raw groundwater source sample collected under §290.109(d)(3)(C)(ii),
				  (4)(B), (C), or (E) of this title (relating to Microbial Contaminants) was
				  positive for fecal indicators, or if a significant deficiency was identified,
				  or if the system is not required to conduct raw groundwater source monitoring
				  because it provides at least 4-log treatment of viruses at each groundwater
				  source. At the discretion of the executive director, a public water system not
				  excluded under this subsection, shall comply with the requirements of this
				  section after exceeding a treatment technique trigger as described in
				  accordance with §
										290.109 of
				  this title. A public water system shall comply with provisions of
				  §290.109(d)(3)(C)(ii), (4)(B), (C), or (E) of this title except in cases
				  where the executive director determines that the sample collected under §
										290.109(d)(1)
				  and (2) of this title meets the executive
				  director's criteria for invalidation as described in §
										290.109(e)(1)
				  of this title. A public water system with a groundwater under the direct
				  influence of surface water (GUI) or surface water/groundwater blended
				  source(s), which provides disinfection and filtration, shall comply with
				  provisions of this section except in cases where the executive director
				  determines that the significant deficiency is in a portion of the distribution
				  system that is served solely by surface water or groundwater under the direct
				  influence of surface water.
(1) A groundwater
				  system must provide written notification to the executive director that it is
				  not required to meet the raw groundwater source monitoring requirements under
				  §
											290.109(d)(4)
				  of this title because it provides at least 4-log treatment of viruses for the
				  specified groundwater source and must begin compliance monitoring in accordance
				  with subsection (c) of this section. The notification must include engineering,
				  operational, and other information required by the executive director to
				  evaluate the submission. If the executive director determines and documents in
				  writing that 4-log treatment of viruses is no longer necessary for a specified
				  groundwater source or if the system discontinues 4-log treatment of viruses
				  before the first connection for any groundwater source, the system must
				  document this in writing and conduct raw groundwater source sampling as
				  required under §
											290.109(d)(4)
				  of this title. If the public water system discontinues 4-log treatment it shall
				  receive prior approval in writing from the executive director that 4-log
				  treatment is no longer necessary for that groundwater source.
(2) A groundwater system that places a
				  groundwater source in service after November 30, 2009, that is not required to
				  meet the raw source monitoring requirements under §
											290.109(d)(4)
				  of this title because the system provides at least 4-log treatment of viruses
				  for a specified groundwater source must begin compliance monitoring within 30
				  days of placing the source in service in accordance with subsection (c) of this
				  section. The system must provide written notification to the executive director
				  that it provides at least 4-log treatment of viruses before the first
				  connection for the specified groundwater source. The notification must include
				  engineering, operational, and other information required by the executive
				  director to evaluate the submission. The system must conduct triggered source
				  monitoring under §
											290.109(d)(4)
				  of this title until the executive director provides written approval of the
				  system's request to provide the 4-log treatment. If the system discontinues
				  4-log treatment of viruses before the first connection for a groundwater
				  source, the system must conduct raw groundwater source sampling as required
				  under §
											290.109(d)(4)
				  of this title. If the public water system discontinues 4-log treatment it shall
				  receive prior approval in writing from the executive director that 4-log
				  treatment is no longer necessary for that groundwater source.