Groundwater Contamination Incidents

For information on specific groundwater contamination incidents, please click on the links below.

• McCullom Lake
• McHenry
• Port Barrington
• Spring Grove
• Arsenic in McHenry County
• Former Toastmaster Property - Algonquin
• Fox River Grove
• Crystal Lake
• Union
• Marengo
• Woodstock

McHenry

• Illinois Environmental Protection Agency (IEPA) - Notice Letter to Citizens (1/19/07) [PDF]
• Illinois Environmental Protection Agency (IEPA) - Fact Sheets for Public Notice (1/18/07) [PDF]
• Aerial Map of Well Water Sampling (1/10/07 - 10/26/09) [PDF]
• IEPA - Illinois Labs Accredited to Analyze Volatile Organic Compounds (VOC's) [PDF]
• Illinois Environmental Protection Agency (IEPA) Fact Sheet (December 2009) - McHenry Groundwater Contamination Update [PDF]

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 Port Barrington - Riverwalk Subdivision

Information Flyers Provided to Residents

• Initial Notification - 12/8/07 [PDF]
• Expanded Notification - 12/18/07 [PDF]
• Status Update Memo - 12/21/07 [PDF]
• Status Update Memo - 12/27/07 [PDF]
• Status Update Memo - 1/30/08 [PDF]
• Recommendation Memo - 5/12/08 [PDF]

Agency Response

• Illinois Department of Agriculture - Letter of Determination (2/27/08) [PDF]
• Illinois Environmental Protection Agency Response (3/17/08) [PDF]
• Illinois Department of Public Health Recommendations (2/19/08) [PDF]   
  • National Sanitation Foundation (NSF) Drinking Water Treatment Standards [PDF]
• Groundwater Investigation Report by Rooney Consultants, Inc. (5/20/09) [PDF]
  • Report provided for information purposes only.  The McHenry County Department of Health does not verify the accuracy of the report.

Aerial Maps of Well Water Sampling Results

• Dye Map (11/27/07 - 1/15/08) [PDF]
• Coliform Bacteria Map (11/27/07 - 1/7/08) [PDF]
• Nitrate Map (12/7/07 - 12/19/07) & (12/7/07 - 1/7/08) [PDF]
• Chloride Map (12/7/07 - 1/7/08) [PDF]
• Copper Map (11/27/07 - 12/19/07) & (11/27/07 - 1/2/08) [PDF]
• Synthetic Organic Compounds (SOC's) Map (1/7/08) [PDF]

 Material Safety Data Sheets (MSDS) - Pond Treatment Chemicals

• Syngenta MSDS [PDF]
• Touchdown MSDS [PDF]
• Aquathol MSDS [PDF]
• Cygnet Select MSDS [PDF]

Riverwalk Homeowners Association Service Reports

• Service Report for Ponds and Rill System [PDF]

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 Spring Grove

• Presentation to Residents (5/06) [PDF]
• Agency for Toxic Substances and Disease Registry Chemical Fact Sheet (ATSDR) [PDF]
• Aerial Map of Well Water Sampling/Results
  • West Spring Grove [PDF]
  • East Spring Grove [PDF]

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 Arsenic in McHenry County

General Education Information/Fact Sheets

• Aquanotes by Illinois Association of Groundwater Professionals [PDF]
• Illinois State Water Survey (ISWS) [PDF]
• McHenry County Department of Health Press Release (11/21/07) [PDF]

Health Implications

• Illinois Department of Public Health (IDPH) Fact Sheet [PDF]
• Agency for Toxic Substances and Disease Registry (ATSDR) [PDF]

 Maps of Water Wells Sampled for Naturally Occurring Arsenic

• Summary Map of all Water Wells Tested for Arsenic [PDF]
• Map of No Detections [PDF]
• Map of Detections of Arsenic at or below Maximum Contaminate Level (MCL) [PDF]
• Map of Detections of Arsenic above Maximum Contaminate Level (MCL) [PDF]

Treatment

• Options [PDF]

Certified Labs

• Illinois Environmental Protection Agency (IEPA) Certified Labs [PDF]
• Local IEPA Certified Labs [PDF]

Related Links

• Environmental Protection Agency (EPA)
• Illinois State Water Survey (ISWS)

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 Former Toastmaster Property - Algonquin

• IEPA Fact Sheet - November 2009 [PDF]
• Joint Press Release - 10/23/09 [PDF]
• Public Availability Session - 11/12/09 [PDF]
• IDPH Fact Sheet - Vapor Intrusion
• Agency For Toxic Substances and Disease Registry [PDF]
• Interim Remedial Investigation Report [PDF]
• IEPA Fact Sheet - August 2010 [PDF]

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 Fox River Grove

• Illinois Environmental Protection Agency (IEPA) News Release - Public Water Supply [PDF]

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 Crystal Lake

• Illinois Environmental Protection Agency (IEPA) News Release - Public Water Supply [PDF]
• OakGrigsby Fact Sheet [PDF]

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Union

• State Recommends Water Well Testing for Union [PDF]
• Illinois Environmental Protection Agency (IEPA) Public Notice for Union [PDF]

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Marengo

• Arnold Magnetic Technologies - IEPA Notice Letter (6/13/13) [PDF]
• Arnold Magnetic Technologies - IEPA Fact Sheet [PDF]
• Recommendation for Private Water Well Testing [PDF]
• Marengo Map [PDF]
• Approved VOC Laboratories [PDF]
• Local IEPA Certified Laboratories [PDF]

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 Woodstock

• Recommendation for Private Water Well Testing [PDF]
• Approved VOC Laboratories [PDF]
• Woodstock Private Water Well Sample Results 2011 [PDF]

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