{"schema_version":"1.2","pwsid":"IL2015345","system_name":"ROCKFORD MHC, LLC","city":"SIMPSONVILLE","state":"IL","population_served":240,"source_type":"GW","summary":"ROCKFORD MHC, LLC serves approximately 240 people in SIMPSONVILLE, Illinois. Based on contaminant analyses from DNR, WQP, EPA ECHO, 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 1995 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"1995-04-01","end":"2026-09-21"},"contaminants_tested":14,"contaminants_detected":14,"exceedances":0,"guideline_exceedances":0,"contaminants":[{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":4.85,"unit":"mg/L","sample_date":"2026-09-21","source":"DNR","source_scope":"source_monitoring","health_guideline_value":10,"health_guideline_source":"EPA MCLG","epa_mcl_value":10,"status":"below_limits","detection_limit":null},{"name":"PFHpA (Perfluoroheptanoic 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