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Water: Safe Drinking Water Act

Small System Compliance Technology List For The Surface Water Treatment Rule

This guidance document supports the Federal Register Notice (FRN) announcing the list of small system compliance treatment technologies for the Surface Water Treatment Rule (SWTR).  With the FRN, EPA has met the August 6, 1997 deadline set by the 1996 Amendments to the Safe Drinking Water Act (SDWA) [§1412(b)(4)(v)].  Thus, the FRN and this guidance document are meant to provide information that small systems may need to comply with the SWTR, but they do not supersede the requirements of the SWTR.

The FRN and the guidance document describe the performances and limitations of the listed filtration and disinfection technologies. The filtration technologies include the technologies listed in the SWTR: conventional, direct, diatomaceous earth, and slow sand filtration; four membrane technologies: reverse osmosis, micro-, ultra-, and nanofiltration; and bag and cartridge filtration.  The disinfection technologies include those listed in the SWTR: chlorine, chloramines, ozone, and chlorine dioxide; UV radiation; and mixed-oxidants.

The discussion is based on information culled from the peer-reviewed literature, manufacturer data and literature, and incorporates input from a stakeholders meeting held in Washington, DC on July 22 and 23, 1997.  Stakeholder input resulted in several major changes to the list:

  • Several of the technologies that were not listed or that were listed for a sub-set of the three small systems categories have now been listed for all size categories.
  • EPA lists the technologies along with the concerns rather than exclude these technologies from the list.
  • The list provides more technology options for individual systems that have the capacity to operate more complex technologies.
  • EPA addresses concerns about consistency through the site-specific pilot testing that can be required by the State.

    o    Click here to download the document "Small System Compliance Technology List for the Surface Water Rule" (45 pages) in ADOBE PDF format (133 KB).

You will need Adobe Acrobat Reader to view the Adobe PDF files on this page. See EPA's PDF page for more information about getting and using the free Acrobat Reader.

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