{"schema_version":"1.2","pwsid":"IL1671200","system_name":"SPRINGFIELD","city":"SPRINGFIELD","state":"IL","population_served":117444,"source_type":"SW","summary":"SPRINGFIELD serves approximately 117,444 people in SPRINGFIELD, Illinois. Based on contaminant analyses from DNR, EPA ECHO, EPA UCMR5, 0 contaminants have been measured above federal EPA standards (MCL) and 2 exceed health-based guidelines. The most significant finding is Arsenic at 0.00063 mg/L, which is 157.5x the health guideline. Data is drawn from source-level compliance monitoring and covers 2016 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2016-12-31","end":"2026-08-27"},"contaminants_tested":39,"contaminants_detected":10,"exceedances":0,"guideline_exceedances":2,"contaminants":[{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":0.15,"unit":"mg/L","sample_date":"2026-08-27","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":"Haloacetic Acids (HAA5)","code":"2456","cas_number":null,"group":"dbps","section":"other_detected","measured_value":28.68,"unit":"ug/L","sample_date":"2026-06-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.0001,"health_guideline_source":"EWG Health 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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":"2026-09-06T14:49:36.593Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":null,"tthm_lraa":[{"monitoring_point":"Well S2HH1","value":46.83,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well S2HT3","value":45.78,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well S2HT4","value":45.4,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well S2HT1","value":46.5,"unit":"ug/L","quarters_used":["2025Q3","2025Q4","2026Q1","2026Q2"],"sample_count":4,"mcl":80,"exceeds_mcl":false},{"monitoring_point":"Well 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