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    Drinking Water Regulations

    Long Term 1 Enhanced Surface Water Treatment Rule

    Long Term 1 Enhanced Surface Water Treatment Rule

    Disinfection Profile

    Checklist for Producing Filter Profiles - LT1ESWTR

    Available on the eLibrary, (3900-FM-BSDW0004)

    The Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) requires continuous individual filter turbidity monitoring and recording for certain public water systems. If any individual filter's turbidity exceeds certain trigger levels, interpretation of filter profiles will be useful in diagnosing possible causes of the exceedence. Water system staff can use this checklist to help produce an accurate and usable filter profile.

    Interpreting Filter Profiles - LTESWTR

    This is a PowerPoint presentation (PowerPoint) that gives specific guidance on interpreting filter profiles. Proper interpretation of filter profiles will help to identify causes of performance spikes.

    Individual Filter Follow-up Activities Notification Form

    Available on the eLibrary, (3900-FM-BSDW0002)

    This form can be used to report the Interim Enhanced Surface Water Treatment Rule (IESWTR) or the Long Term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR) individual filter follow-up activities. Water systems must report certain information to their DEP District Office either by phone, fax, email or mail within the prescribed time frames. District Office fax, phone and address information is included on the back of this form.

    LT1ESWTR External Links

    Pennsylvania's Final LT1ESWTR (PA Bulletin, Vol. 34, No. 25, Saturday, June 19, 2004)

    The final Long Term 1 Enhanced Surface Water Treatment Rule was published in the Pa Bulletin on June 19, 2004. The final-form rulemaking pertains to public drinking water systems serving less than 10,000 people that use either surface water sources or groundwater sources under the direct influence of surface water. The purpose of this rule is to provide Pennsylvanians with a greater level of protection against waterborne, disease-causing organisms such as Cryptosporidium, Giardia, and other waterborne protozoa, bacteria or viruses.

    Long Term 1 Enhanced Surface Water Treatment Rule on EPA's website. You can view or download technical guidance manuals and learn more about ongoing microbial and disinfection byproducts rule-making efforts.