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Overview of Stream Water Quality Data

Overview of Stream Water Quality Data. May 9, 2014. Jay Hoskins, P.E. Metropolitan St. Louis Sewer District. Stream Water Quality Data. Water Quality Standards Water Quality Monitoring Activities Monitoring Results & Trends Impaired Waters & TMDLs.

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Overview of Stream Water Quality Data

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  1. Overview of Stream Water Quality Data May 9, 2014 Jay Hoskins, P.E. Metropolitan St. Louis Sewer District

  2. Stream Water Quality Data Water Quality Standards Water Quality Monitoring Activities Monitoring Results & Trends Impaired Waters & TMDLs

  3. Water Quality Standards (WQS): “Rules of the Game” • Designated Uses (for waterbodies) • Recreation • Whole Body Contact (WBC) • Secondary Contact (SCR) • Protection of Aquatic Life (AQL) • Criteria (for pollutants) • Narrative • Free from… • Numeric • E. Coli (recreation) • Chloride (AQL) • Ammonia (AQL) • Antidegradation (a process)

  4. Streams with Designated Uses: Classified Streams Presumed Use: Fishable and Swimmable

  5. MSD Water Quality Monitoring Points • 40+ monitoring locations/stations • Missouri & Mississippi Rivers • Streams with constructed CSOs • RDP, Maline, Black, Deer • Streams with constructed SSOs • Ex.: Watkins, Creve Coeur, Coldwater, Gravois, & Fishpot • Streams impacted by NPS pollution • Ex.: Kiefer

  6. Local Pollutants of Concern • “Focus” Parameters • Bacteria (E. Coli, Fecal coliform) • Chloride • Nutrients • Others • Dissolved Oxygen • pH • Trash • Sediment • Ammonia • Lead • Mercury

  7. Urban Streams: Bacteria Levels

  8. Mississippi River: Bacteria Trends

  9. All Streams: Seasonal Bacteria Trends

  10. Temporal Bacteria Trends

  11. Urban Stream Chloride Levels • Chloride levels frequently exceed chronic and acute water quality criteria • Chronic = 230 mg/L • Acute = 860 mg/L • Highest levels are more centrally located • Lowest levels occur near western outskirts

  12. Seasonal Chloride Trends

  13. Seasonal Nutrient Trends Mississippi River Stations Total Nitrogen (mg/L) Total Phosphorous (mg/L)

  14. Seasonal Nutrient Trends Urban Stream Stations Total Nitrogen (mg/L) Total Phosphorous (mg/L)

  15. Runoff and Gulf Hypoxia

  16. Impaired Waters & TMDLs • Water quality data forms the basis of the list of impaired waters (i.e., 303(d) list) • 20 St. Louis City & County impaired streams on list • Common pollutants: bacteria & chloride • Waters on the 303(d) list  Total Maximum Daily Loads (TMDLs) • TMDL=Pollution “Diet Plan” • Implemented through NPDES Permits • Local TMDL Update • No new TMDLs were proposed in 2013 • In 2014, anticipate revising bacteria (E. coli) TMDLs for 4 streams in MSD

  17. Next Steps • Anticipate continued water quality data collection & analysis • Consent Decree (Post-Construction Monitoring) • Impaired Waters • Newly classified streams • Revised criteria • Programs implemented to improve WQ • Consent Decree • Sanitary and Combined System Performance Improvements • MS4 Program • Stormwater NPS pollution

  18. Jay Hoskins (314) 436-8757 jshosk@stlmsd.com Questions?

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