{"schema_version":"1.2","pwsid":"IL0335030","system_name":"ROBINSON-PALESTINE WATER COMMISSION","city":"ROBINSON","state":"IL","population_served":11331,"source_type":"GW","summary":"ROBINSON-PALESTINE WATER COMMISSION serves approximately 11,331 people in ROBINSON, Illinois. Based on contaminant analyses from WQP, EPA ECHO, EPA UCMR5, 1 contaminant has been measured above federal EPA standards (MCL) and 1 exceeds health-based guidelines. The most significant finding is PFOS (Perfluorooctane Sulfonate) at 0.0046 ug/L, which is 1.2x the EPA legal limit. Data is drawn from source-level compliance monitoring and covers 2001 through 2025. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2001-11-30","end":"2025-12-31"},"contaminants_tested":31,"contaminants_detected":3,"exceedances":1,"guideline_exceedances":1,"contaminants":[{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":21,"unit":"mg/L","sample_date":"2015-04-13","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},{"name":"Lead (90th Percentile)","code":"PB90","cas_number":"7439-92-1","group":"lead_copper","section":"other_detected","measured_value":0,"unit":"mg/L","sample_date":"2025-12-31","source":"EPA ECHO","source_scope":"federal_program","health_guideline_value":0.0002,"health_guideline_source":"OEHHA PHG","epa_mcl_value":null,"status":"below_limits","detection_limit":null},{"name":"PFOS (Perfluorooctane Sulfonate)","code":"PFOS","cas_number":"1763-23-1","group":"pfas","section":"legal_violation","measured_value":0.0046,"unit":"ug/L","sample_date":"2024-09-03","source":"EPA UCMR5","source_scope":"federal_program","health_guideline_value":0,"health_guideline_source":"EPA MCLG","epa_mcl_value":0.004,"status":"exceeds_legal_limit","detection_limit":0.004},{"name":"PFHxS (Perfluorohexane Sulfonate)","code":"PFHXS","cas_number":"355-46-4","group":"pfas","section":"pfas","measured_value":0.004,"unit":"ug/L","sample_date":"2024-09-03","source":"EPA UCMR5","source_scope":"federal_program","health_guideline_value":0.01,"health_guideline_source":"EPA MCLG","epa_mcl_value":0.01,"status":"below_limits","detection_limit":0.003}],"sources":[{"name":"WQP","url":"https://www.waterqualitydata.us/"},{"name":"EPA ECHO","url":"https://echo.epa.gov/"},{"name":"EPA UCMR5","url":"https://www.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring-rule"}],"pfas_combined_display":null,"well_counts":{"active":5,"retired":7,"facilities_synced_at":"2026-09-06T14:49:36.593Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":{"value":0.4,"compounds_used":["PFHXS"],"is_partial":true,"threshold":1,"components":[{"code":"PFHXS","value_ng_l":4,"hbwc_ng_l":10,"ratio":0.4}]},"tthm_lraa":[],"haa5_lraa":[]}