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 Getting to Know Your Watershed

 

 

 Impairments

The Illinois Environmental Protection Agency is responsible for assessing stream health in Illinois. These assessments are published on a two year cycle in a newly titled report: Illinois Integrated Water Quality Report and Section 303(d) List – 2006. This report describes the designated uses for each water body and how well those uses are being supported. The report also lists the possible causes and sources of water quality impairments. This information is used to develop the Section 303(d) otherwise known as the List of Impaired Waters or simply the TMDL list. The table below lists the potential reasons or causes why our streams are not fully supporting the General Use and/or Aquatic Life Use.

 

Causes and Sources of Impairment for the
East and West Branches of the DuPage River
Based on the 2006 Integrated Water Quality Report and Section 303(d) List

Potential Causes of Impairment

Potential Sources of Impairment

In-stream Effect

Sedimentation/Siltation

Site Clearance (Land Development or Redevelopment), Urban Runoff/Storm Sewers, Highways, Road, Bridges, Infrastructure (New Construction), impacts from Hydro-structure Flow Regulations/Modifications

Covering of stream bottom habitat with silt, cloudy water, difficult for fish to see prey, depletion of Oxygen needed by fish and macroinvertebrates

Total Suspended Solids

Contaminated Sediments, Municipal Point Source Discharges

Covering of stream bottom habitat with silt, cloudy water, difficult for fish to see prey

Breakdown of organic matter (from stream bank erosion, upland washoff, water treatment works and decaying aquatic vegetation) in stream, particularly behind dams, high rates algae growth and high water temperatures.

Channelization, Impacts from Hydro-structure Flow Regulations/Modifications, Urban Runoff/Storm Sewers, Municipal Point Source Discharges

Depletion of Oxygen needed by fish and macroinvertebrates

Total Phosphorus

Municipal Point Source Discharges, Urban Runoff/Storm Sewers, Runoff from Forest/Grassland/Parkland, Waterfowl, Specialty Crop Production,

Increased Algal Growth, Depletion of Oxygen needed by fish and macroinvertebrates

Total Nitrogen

Site Clearance (Land Development or Redevelopment), Urban Runoff/Storm Sewers, Road, Bridges, Infrastructure (New Construction), Streambank Modifications /destabilization, Loss of Riparian Habitat

Increased algal growth, Depletion of Oxygen needed by fish and macroinvertebrates

Chlorides
-Urban Runoff/Storm -Sewers, Municipal Point -Source Discharges
-Road deicing operations

Increased salinity

Bacteria, Public Health/Primary Contact with water, reduction of flora and fauna diversity as salt intolerant species are pushed out

Fecal Coliform

Urban Runoff/Storm Sewers, Source Unknown

Hexachlorobenzene

Contaminated Sediments

Toxic Substance - Automotive

Mercury

Contaminated Sediments

Toxic Substance - Heavy Metal

DDT

Contaminated Sediments

Toxic Substance - Pesticide

Oil & Grease

Source Unknown

 

Aldrin

Contaminated Sediments

Toxic Substance - Pesticide

Silver

Contaminated Sediments

Toxic Substance - Metals

pH

Impacts from Hydro-structure Flow Regulations /Modifications

 

Zinc

Urban Runoff/Storm Sewers, Municipal Point Source Discharges

Toxic Substance - Metals

Copper

Municipal Point Source Discharges

Toxic Substance - Metals

 

 

Contact Us


10S404 Knoch Knolls Road

Naperville, IL 60565


Phone: 630-428-4500

Fax: 630-428-4599

E-mail: Tara Neff

 

 

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