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InterimEnhanced Surface Water Treatment Rule (IESWTR)
and Disinfection By-products Rule (DBPR): Drinking Water

The provisions of the IESWTR and DBPR went into effecton January 1, 2002.

Theseare federal rules which apply to public water systems that use surfacewater, or ground water under the direct influence of surface water(GWUDI), and serve at least 10,000 people. The rules aredesigned to improve the quality of the water delivered by surfacewater treatment plants. For instance, the allowable turbidity froma surface water treatment plant has been reduced from .5 to .3 NTU.

Currently,the primary enforcement responsibility for these rules rests with EPARegion 8. The Utah Division of Drinking Water intends to assumethis role at some future date. Until that time, for assistance pleasecontact Bob Clement with EPA Region 8 at (800) 227-8917.

Forfurther information on the rules, see:

Systemssubject to the new rules must continue submitting the usual monthlyoperational reports to the Utah Division of Drinking Water.

Additionally,monthly operational reports must be sent to BobClement at EPARegion 8. The above-mentioned Utah form (which describes combinedfilter effluent) must be sent, along with the appropriate additionalforms:


  • Monitoring Plan for Bromate and Bromide for Systems Using Ozone
  • Monitoring Plan for Chlorine/Chloramines
  • Monitoring Plan for Chlorite and Chlorine Dioxide for Systems for Using Chlorine Dioxide
  • Monitoring Plan for Source and Finished Water Alkalinity
  • Monitoring Plan for Source and Finished Water Magnesium
  • Monitoring Plan for Source Water Specific Ultraviolet Absorption (SUVA).Monitoring Plan for Finished Water Specific Ultraviolet Absorption (SUVA)
  • Monitoring Plan for Source Water Total Organic Carbon (TOC) for Reduced Monitoring for TTHMs/HAA5s
  • Monitoring Plan for Source Water Total Organic Carbon (TOC), Source Water Alkalinity and Finished Water TOC
  • Monitoring Plan for TTHMs / HAA5s
  • Worksheet on How to Calculate the Number of Samples for TTHMs / HAA5s