{"schema_version":"1.2","pwsid":"IL1450150","system_name":"PINCKNEYVILLE","city":"PINCKNEYVILLE","state":"IL","population_served":5804,"source_type":"SW","summary":"PINCKNEYVILLE serves approximately 5,804 people in PINCKNEYVILLE, Illinois. Based on contaminant analyses from DNR, EPA ECHO, EPA UCMR5, the most recent monitoring readings are within federal EPA standards (MCL), but this system has active MCL violations on record for 1 contaminant. 3 contaminants exceed health-based guidelines. The most significant finding is Lead (90th Percentile) at 0.00418 mg/L, which is 20.9x the health guideline. Data is drawn from source-level compliance monitoring and covers 2017 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2017-12-31","end":"2026-09-22"},"contaminants_tested":40,"contaminants_detected":10,"exceedances":0,"guideline_exceedances":3,"contaminants":[{"name":"Haloacetic Acids (HAA5)","code":"2456","cas_number":null,"group":"dbps","section":"other_detected","measured_value":33.6,"unit":"ug/L","sample_date":"2026-06-23","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.0001,"health_guideline_source":"EWG Health Guideline","epa_mcl_value":0.06,"status":"below_limits","detection_limit":null},{"name":"Total Trihalomethanes (TTHMs)","code":"2950","cas_number":null,"group":"dbps","section":"other_detected","measured_value":72.8,"unit":"ug/L","sample_date":"2026-06-23","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.00015,"health_guideline_source":"EWG Health Guideline","epa_mcl_value":0.08,"status":"approaching","detection_limit":null},{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":0.29,"unit":"mg/L","sample_date":"2026-05-19","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":"Arsenic","code":"ARSENIC","cas_number":"7440-38-2","group":"inorganics","section":"guideline_exceedance","measured_value":0.00075,"unit":"mg/L","sample_date":"2026-01-27","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.000004,"health_guideline_source":"OEHHA PHG","epa_mcl_value":0.01,"status":"exceeds_guideline","detection_limit":null},{"name":"Barium","code":"BARIUM","cas_number":"7440-39-3","group":"inorganics","section":"other_detected","measured_value":0.0235,"unit":"mg/L","sample_date":"2026-01-27","source":"DNR","source_scope":"source_monitoring","health_guideline_value":1,"health_guideline_source":"OEHHA PHG 2003 (hypertension endpoint)","epa_mcl_value":2,"status":"below_limits","detection_limit":null},{"name":"Fluoride (natural)","code":"FLUORIDE","cas_number":"16984-48-8","group":"inorganics","section":"other_detected","measured_value":0.75,"unit":"mg/L","sample_date":"2026-01-27","source":"DNR","source_scope":"source_monitoring","health_guideline_value":4,"health_guideline_source":"EPA MCLG","epa_mcl_value":4,"status":"below_limits","detection_limit":null},{"name":"Atrazine","code":"2050","cas_number":null,"group":"vocs","section":"guideline_exceedance","measured_value":0.32,"unit":"ug/L","sample_date":"2025-12-22","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.00015,"health_guideline_source":"OEHHA PHG 1999","epa_mcl_value":0.003,"status":"exceeds_guideline","detection_limit":null},{"name":"Toc","code":"TOC","cas_number":null,"group":"other","section":"other_detected","measured_value":7.8,"unit":"mg/L","sample_date":"2026-09-22","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null},{"name":"Lead (90th Percentile)","code":"PB90","cas_number":"7439-92-1","group":"lead_copper","section":"guideline_exceedance","measured_value":0.00418,"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":"exceeds_guideline","detection_limit":null},{"name":"Copper (90th Percentile)","code":"COPPER","cas_number":"7440-50-8","group":"lead_copper","section":"other_detected","measured_value":155,"unit":"ug/L","sample_date":"2026-08-14","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.3,"health_guideline_source":"OEHHA PHG","epa_mcl_value":null,"status":"below_limits","detection_limit":null}],"sources":[{"name":"DNR","url":"https://apps.dnr.wi.gov/dwsportalpub"},{"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":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":[{"monitoring_point":"Well S2HT2","value":72.8,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well S2HH1","value":69.18,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well S2HTB1","value":65.5,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false}],"haa5_lraa":[{"monitoring_point":"Well S2HT2","value":33.6,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":60,"exceeds_mcl":false},{"monitoring_point":"Well S2HH1","value":31.6,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":60,"exceeds_mcl":false},{"monitoring_point":"Well S2HTB1","value":30.13,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":60,"exceeds_mcl":false}]}