{"schema_version":"1.2","pwsid":"IL1190150","system_name":"BETHALTO","city":"BETHALTO","state":"IL","population_served":15210,"source_type":"GW","summary":"BETHALTO serves approximately 15,210 people in BETHALTO, Illinois. Based on contaminant analyses from DNR, WQP, EPA ECHO, EPA UCMR5, 0 contaminants have been measured above federal EPA standards (MCL) and 1 exceeds health-based guidelines. The most significant finding is Lead (90th Percentile) at 0.0012 mg/L, which is 6x the health guideline. Data is drawn from source-level compliance monitoring and covers 2005 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2005-07-11","end":"2026-12-31"},"contaminants_tested":44,"contaminants_detected":23,"exceedances":0,"guideline_exceedances":1,"contaminants":[{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":1.1,"unit":"mg/L","sample_date":"2026-07-27","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":6.49,"unit":"ug/L","sample_date":"2026-04-15","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.0001,"health_guideline_source":"EWG Health 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