{"schema_version":"1.2","pwsid":"WI1130074","system_name":"CAMBRIDGE WATER & SEWER UTILITY","city":"CAMBRIDGE","state":"WI","population_served":1638,"source_type":"GW","summary":"CAMBRIDGE WATER & SEWER UTILITY serves approximately 1,638 people in CAMBRIDGE, Wisconsin. Based on contaminant analyses from DNR, WQP, EPA ECHO, 0 contaminants have been measured above federal EPA standards (MCL) and 2 exceed health-based guidelines. The most significant finding is Lead (90th Percentile) at 0.00116 mg/L, which is 5.8x the health guideline. Data is drawn from source-level compliance monitoring and covers 2014 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2014-07-02","end":"2026-03-18"},"contaminants_tested":71,"contaminants_detected":18,"exceedances":0,"guideline_exceedances":2,"contaminants":[{"name":"Chlorine (free)","code":"0700","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.59,"unit":"mg/L","sample_date":"2026-03-18","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":"Chlorine (total residual)","code":"0700_TOTAL","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.74,"unit":"mg/L","sample_date":"2026-03-18","source":"DNR","source_scope":"source_monitoring","health_guideline_value":4,"health_guideline_source":"EPA 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(226+228)","code":"4010","cas_number":null,"group":"radionuclides","section":"other_detected","measured_value":0.245,"unit":"pCi/L","sample_date":"2025-03-20","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0,"health_guideline_source":"EPA MCLG","epa_mcl_value":5,"status":"below_limits","detection_limit":null},{"name":"Gross Alpha Radiation (excluding Radon and 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