Water Quality StandardsWater Quality Standards303(d) List303(d) ListTotal Maximum Daily LoadsTotal Maximum Daily Loads

Phil SchroederWater Protection ProgramMissouri Department of Natural Resources

Set goals and WQS

Develop and Implement strategies to restore

water quality

Conduct monitoring

YesNo

Meeting WQS?

Water Quality Based Water Quality Based ProcessProcess

Prepare 303(d) List

Water Quality Water Quality StandardsStandards

Goal of the Clean Water Goal of the Clean Water ActAct

• Section 101(a) • Restore and maintain the chemical, physical,

and biological integrity of the Nation’s waters

• Wherever attainable, provide for protection and propagation of fish, shellfish, and wildlife and provide for recreation in and on the water (“fishable / swimmable”)

Water Quality Water Quality StandardsStandards

• Specific (Numeric) Criteria• General (Narrative) Criteria• Antidegradation Policy and Procedure• Water Classification and Use Designations

Water ClassificationWater Classification• Lakes (455 - 293,257.8 acres)

L1 - Primarily Used for Drinking Water SupplyL2 - Major ReservoirsL3 - Other Lakes

• Streams (3761 - 22,231.2 miles)P - Permanent FlowP1 - Standing Water Reaches of Class P StreamsC - Intermittent Flow

• Wetlands - Class W • Unclassified Waters - Class U

Use DesignationsUse Designations• Aquatic Life• Swimming• Boating• Livestock Watering• Irrigation• Fish Consumption• Drinking Water

Supply

• Industrial Process Water

• Historic Preservation• Hydrologic Cycle

Maintenance• Educational/Scientific

Significance

Use Attainability Use Attainability AnalysisAnalysis

Use Assessment Criteria - 131.10(g):1 - Naturally Occurring Pollutant Concentrations2 - Insufficient Flow3 - Non-Remedial Human Caused Conditions4 - Hydrologic Modifications5 - Natural Physical Conditions6 - Remedy Causes Socio-Economic Hardship

More on Use More on Use DesignationDesignation

• Attainable UseAttainable Use

• Existing UseExisting Use

• Designated UseDesignated Use

• Presumed UsePresumed Use

Specific CriteriaSpecific Criteria10 CSR 20-7.031(4)10 CSR 20-7.031(4)

Table A - Numeric CriteriaTable B1 - Acute AmmoniaTables B2 and B3 - Chronic AmmoniaNew Table ( K)? - Site-Specific Criteria

Other TablesOther TablesTable C - Streams Cold Water Sport FisheryTable D - Outstanding State Resource WatersTable E - Outstanding National Resource WatersTable F - Metropolitan No-Discharge StreamsTable G - Lake Classifications and Use DesignationsTable H - Stream Classifications and Use DesignationsTable I - Biocriteria Reference StreamsTable J - Losing Streams

General CriteriaGeneral Criteria 10 CSR 20-7.031(3)10 CSR 20-7.031(3)

• Narrative Criteria• Prohibits Any Observable Impairment to

Beneficial Uses• Applies to All Waters of the State

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AntidegradationAntidegradationDischarging additional pollutants to Waters of the State is prohibited unless specific conditions are demonstrated.

Tiers of AntidegradationTiers of Antidegradation Protection Protection

10 CSR 20-7.031(2)10 CSR 20-7.031(2)

Tier 1- Water quality is at, near or below WQS

Tier 2 - Water quality is better than WQS and degradation is allowed when justified

Tier 3 - Outstanding National and State Resource Waters. No degradation allowed.

Existing WaterQuality

Water QualityStandard

Beneficial UseImpairment

Available AssimilativeCapacity

High Quality

Low QualityLow Quality

Antidegradation ReviewAntidegradation Review• Alternatives Analysis

• Demonstrated Social and Economic Importance

• Highest Regulatory Requirements are met

• Approved Watershed Management Plans for Nonpoint Sources are implemented

• Public Participation

Antidegradation Antidegradation Implementation Implementation

ProcedureProcedure• Required of all state programs• Final draft of Missouri’s procedure to be

presented to the Missouri Clean Water Commission on April 20, 2007

• If approved, must be promulgated into rule and accepted by EPA

303(d) List303(d) List

List of waters were regulatory actions have beenList of waters were regulatory actions have been unsuccessful in addressing the control of pollutantsunsuccessful in addressing the control of pollutants

to the extent necessary to prevent impairment ofto the extent necessary to prevent impairment of waters’ beneficial use.waters’ beneficial use.

303(d) Listing 303(d) Listing MethodologyMethodology

• Requires all data be considered• Must be scientifically sound• Impairments based on General Criteria must

be quantified such that a targetable threshold exists for the TMDL

• Significant events on a water body may effect usability of data

303(d) List for 303(d) List for 2004 / 2004 / 20062006

• 74 Waters– down from 190 waters listed in 2002

• 67 TMDLs completed• 45 have insufficient data• 19 required new data analysis• 11 have modified permits issued• 10 new water quality standard• 6 moved to category 3B (further data needed)

• 32 waters from the 2002 303(d) List• 42 new listings

2004/2006 303(d) List

Dissolved Oxygen Metals

OtherBacteria

Pollutants of Concern

TotalTotalMaximuMaximu

mmDaily Daily LoadsLoads

The amount of a specific pollutant a waterbodyThe amount of a specific pollutant a waterbody can receive and still meet Water Quality Standardscan receive and still meet Water Quality Standards

TMDLsTMDLs• Targeted for waters on the 303(d) List• 13-year Schedule for completion• EPA Priorities (Consent Decrees)• State Priorities

– Certainty of impairment and source– Data collection needs– Grouped by region or pollutant type

TMDL ElementsTMDL Elements• Identify All (Total) Sources of Pollutant• Calculate Maximum Pollutant Load • Assign Daily Pollutant Load Allocations to

Point Sources and Nonpoint Sources • Address “Seasonality”• Include “Margin of Safety” to Account for

Uncertainty

Key Factors in a TMDLKey Factors in a TMDLSource(s) PS / NPS

Pollutant / Condition WQS / Use Impairment

Criterion Numeric / General

Target Load WLA + LA

Margin of Safety Explicit / Implicit

TMDL WLA + LA +MOS

TMDL ScenarioTMDL ScenarioSource(s)NPS - Abandoned Mine Land

Pollutant / ConditionSulfates + Chlorides @2000 mg/LAQL Use Impairment

Water Quality Criterion1000 mg/L

Target Load1000 mg/L

Margin of SafetyExplicit - 10 % of LC100 mg/L

TMDL900 mg/L(900 x Flow x CF = #/day)

Allocation FormulaAllocation Formula

LC = (Qs + Qd) * WQC * CF

(0.1 cfs)(2 mg/L)(5.40) = 1.1 pounds per day

Addressing Narrative CriteriaAddressing Narrative CriteriaMatching the Load Allocation to the WQ Standard

• Eutrophication– Chl-a (ug/L) linked to P or N (mg/L)

• Turbidity– Secchi Disk Depth (m) linked to TSS (mg/L)

• Sediments– Bottom Coverage (%) linked to TSS (mg/L)

• Discoloration– Color Match (amt. of color disparity using the Platinum

Cobalt Visual Method) linked to Chem “X”

TMDL ProgressTMDL ProgressCalendar

YearTMDLs

Completed2000 142001 102002 42003 352004 182005 62006 44

Department of Natural Resources 2006 TMDL Development Schedule (Click on a heading below to sort the table.)

WBID Water Body PollutantTarget Datefor Public

Notice

Target Date toSubmit to EPA Comments

3413

HorseshoeCreek,JacksonCounty

BOD, NH3N 2005/01/28 2006/02/23

Permit in Lieu of TMDLSubmitted to EPA2006/02/23Oak Grove WWTP -MO0130371New permit issued2006/02/10

1339

WalnutCreek,CedarCounty

BOD, VSS 2005/12/09 2006/04/05

Permit in lieu of TMDL.Approved on 2006/05/26El Dorado Springs WWTF- MO0040002 Issued 2006/03/24

www.dnr.mo.gov/env/wpp/tmdl/index.htmlwww.dnr.mo.gov/env/wpp/tmdl/index.html

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