McHenry County, IL
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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]
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]
- 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
- 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]
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
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]
- Illinois Environmental Protection Agency (IEPA) News Release - Public Water Supply [PDF]
- OakGrigsby Fact Sheet [PDF]
- State Recommends Water Well Testing for Union [PDF]
- Illinois Environmental Protection Agency (IEPA) Public Notice for Union [PDF]
- 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]
- Recommendation for Private Water Well Testing [PDF]
- Approved VOC Laboratories [PDF]
- Woodstock Private Water Well Sample Results 2011 [PDF]