{"schema_version":"1.2","pwsid":"IL1355100","system_name":"GRAHAM CORRECTIONAL SITE","city":"HILLSBORO","state":"IL","population_served":2155,"source_type":"SW","summary":"GRAHAM CORRECTIONAL SITE serves approximately 2,155 people in HILLSBORO, Illinois. Based on contaminant analyses from WQP, 0 contaminants have been measured above federal EPA standards (MCL) and 0 exceed health-based guidelines. No contaminants were measured above federal EPA standards in recent compliance monitoring. Data is drawn from source-level compliance monitoring and covers 2000 through 2013. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2000-10-23","end":"2013-07-11"},"contaminants_tested":0,"contaminants_detected":0,"exceedances":0,"guideline_exceedances":0,"contaminants":[{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":15,"unit":"mg/L","sample_date":"2013-07-11","source":"WQP","source_scope":"regional_groundwater","health_guideline_value":10,"health_guideline_source":"EPA MCLG","epa_mcl_value":10,"status":"exceeds_legal_limit","detection_limit":null}],"sources":[{"name":"WQP","url":"https://www.waterqualitydata.us/"}],"pfas_combined_display":null,"well_counts":{"active":0,"retired":0,"facilities_synced_at":"2026-10-26T01:13:06.376Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":null,"tthm_lraa":[],"haa5_lraa":[]}