State Water Quality Assessments Under the Clean Water Act

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State Water Quality Assessments Under the Clean Water Act. National Water Quality Monitoring Council. Charles Spooner Assessment and Watershed Protection Division Monitoring Branch. 303(d) Listing & TMDLs. Objectives: - PowerPoint PPT Presentation

Text of State Water Quality Assessments Under the Clean Water Act

  • State Water Quality AssessmentsUnder the Clean Water ActCharles Spooner Assessment and Watershed Protection Division Monitoring Branch National Water Quality Monitoring Council

  • 303(d) Listing & TMDLsObjectives:Present a brief overview of assessment methodologies under Sections 303(d) and 305(b) of the CWA Discuss process of identifying impaired watersDescribe State reporting & submission options

    Module Objectives

  • CWA Framework303(d) Program40 CFR 130.7Defines the water quality goalCompile data/information and assess waterbody conditionImplementation

    Adopt Water Quality Standards

    Monitor and Assess Waters

    List Impaired & Threatened Waters

    Develop TMDLs(TMDL=WLA+LA+MOS)

    Control Point SourcesVia NPDES Permits

    Manage Nonpoint SourcesThrough Grants, Partnerships,and Voluntary Programs


  • WATER QUALITY STANDARDS.what were aiming forDevelopTMDLsImplementTMDLsMonitorResultsMonitoringandAssessmentWQSWritePermitsReport Water Quality & IdentifyImpairedWaters

  • Regulations (40 CFR 130.7)Each State shall identify those water quality-limited segments still requiring TMDLs within its boundaries for which:Technology based effluent limitationsMore stringent effluent limitationsOther pollution control requirementsAre not stringent enough to implement any water quality standards applicable to such watersRegulatory Requirements

  • Regulations (40 CFR 130.7)For waters identified in the 303(d) list: TMDLs shall be established for all pollutants preventing or expected to prevent attainment of water quality standardsTMDLs shall be established at levels necessary to attain and maintain the applicable narrative and numerical WQSRegulatory Requirements

  • PollutantMeans dredged spoil, solid waste, incinerator residue, filter backwash, sewage sludge, munitions, chemical wastes, biological materials, (some) radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal, and agricultural waste discharged into water.

    (CWA Sec. 502(6))Regulatory Requirements

  • State Options for Reporting WQ StatusReporting Minimally Required by Regulations

    Recommended Reporting Format47 States are using the Integrated Report format

  • Five Reporting CategoriesFor Each Assessment Unit (Segment)IRG Guidance

  • Segment start Segment endConceptual Example: Multiple Categories

  • National Picture of Assessed and Impaired WatersNationwide, % of waters assessed to see if water quality standards being met (2002 305(b) list): 19% of rivers/stream miles37% Lakes/ponds/reservoirs acres35% Estuarine square miles:9% Great Lakes shoreline miles Assessed waters that are impaired, by waterbody type:45% Rivers/streams 47% Lakes/ponds/reservoirs 32% Estuaries 91% Great Lakes shoreline Most of these waters will go on the 303(d) listListing Process

  • Listing of Impaired WatersOver 38,000 listed segments, with one or more impairmentsApproximately 64,000 waterbody-pollutant combinations reported Indication of TMDLs that will need to be completedTop 5 causes of impairment (updated October, 2007)Mercury: 13%Pathogens: 13%Sediment : 11 %Metals (other than Mercury): 10%Nutrients: 8% Low dissolved oxygen: 7%Summary StatisticsSummary Statistics

  • TMDLs needed by pollutant type and number of TMDLs that have been developedApprox. 64,000 TMDLs needed; over 26,000 developed (10/2007)








    Causes of Impairment

    Approved TMDLs


    Updated 10/25/2007

    Causes of Impairment




    Metals (other than Hg)6392


    Oxygen Depletion4568


    Total Listings63629

    Approved TMDLs by Pollutant




    Metals (other than Hg)5422


    Oxygen Depletion1425


    Total TMDLs26809








    Causes of Impairment

    Approved TMDLs



  • Listing of Impaired Waters1. States identify waters not meeting WQS based on all existing and readily available information2. States establish priorities for TMDLs on basis of the use and severity of problem 3. States develop schedule of TMDLs to be developed within 2 years 4. States provide long term plan complete TMDLs 8 to 13 years from first listing5. EPA has 30 days to approve or disapprove list submitted April 1st of each even yearIf EPA disapproves State list, EPA has 30 days to develop list for the StateListing ProcessState driven process

  • Any Questions?

    WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)Total Number of Impaired Waters Reported: 38,688 (10/25/2007)

    Total Causes of Impairment Reported Nationwide: 63,629 (10/25/2007)

    Note: Approximately 2 impairments per waterbody segmentWQSA: Module 20 - TMDLs (Denver)Last updated 10/25/2007WQSA: Module 20 - TMDLs (Denver)WQSA: Module 20 - TMDLs (Denver)