{ "dataset": "Illinois lake-type waterbodies reported to EPA ATTAINS", "scope": "Every lake-type assessment unit Illinois reports, not only those with a page on plainlakes.com.", "state": { "code": "IL", "name": "Illinois", "url": "https://plainlakes.com/state/illinois/" }, "reporting_cycles": "1988–2026", "count": 783, "sources": [ { "source": "EPA ATTAINS", "vintage": "Reporting cycles 1987–2026" }, { "source": "USGS National Water Information System", "vintage": "Trailing 365 days, through 2026-08-16" } ], "license": "https://plainlakes.com/terms/", "attribution": "PlainLakes (plainlakes.com), compiled from EPA ATTAINS and USGS NWIS", "disclaimer": "Assessment verdicts are the decisions of the state agency or tribal nation that filed them, as published to EPA ATTAINS, and are reproduced without modification. PlainLakes is not affiliated with the federal government.", "waterbodies": [ { "assessment_unit_id": "IL_(NotAssigned)_LakeMichigan", "name": "Collectively, L. 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Michigan) not assigned to a specific Assessment Unit.", "water_type": "Lake, Freshwater", "size": { "value": 121874.27, "units": "Acres" }, "overall_status": "Not Assessed", "epa_ir_category": "3", "cycle_last_assessed": "2018", "integrated_report": { "status": "Organization Public Comment", "cycle": "2026", "decided_in_open_cycle": false }, "trophic_status": "Unknown", "designated_uses": { "fish_consumption": { "status": null, "ruled_on": null, "threatened": null }, "recreation": { "status": null, "ruled_on": null, "threatened": null }, "aquatic_life": { "status": null, "ruled_on": null, "threatened": null }, "drinking_water": { "status": null, "ruled_on": null, "threatened": null } }, "listed_causes": 0, "uses_assessed": 0, "uses_assessed_filed_by_epa": 0, "listed_causes_filed_by_epa": 0, "usgs_gauge_site_no": null, "url": "https://plainlakes.com/lake/collectively-illinois-lakes-other-than-l-michigan-not-assigned-to-a-specific-ass-il/" }, { "assessment_unit_id": "IL_ROA", "name": 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