An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

LT1SWTR Form for Alternative Technology Filtration (MF, UL, RO)

Monthly compliance report information for water operators. Use this form if your system uses Membrane Filtration (Microfiltration, Ultrafiltration, or Reverse Osmosis). This form asks for disinfectant residual and turbidity data and for you to perform certain calculations.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.