{"schema_version":"1.2","pwsid":"WI4380444","system_name":"POUND WATERWORKS","city":"POUND","state":"WI","population_served":349,"source_type":"GW","summary":"POUND WATERWORKS serves approximately 349 people in POUND, 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 0.0042 mg/L, which is 21x the health guideline. Data is drawn from source-level compliance monitoring and covers 2002 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2002-06-25","end":"2026-03-09"},"contaminants_tested":86,"contaminants_detected":16,"exceedances":0,"guideline_exceedances":2,"contaminants":[{"name":"Chlorine (total residual)","code":"0700_TOTAL","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.45,"unit":"mg/L","sample_date":"2026-03-09","source":"DNR","source_scope":"source_monitoring","health_guideline_value":4,"health_guideline_source":"EPA 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Uranium)","code":"4000_EXCL","cas_number":null,"group":"radionuclides","section":"other_detected","measured_value":5.03,"unit":"pCi/L","sample_date":"2023-06-06","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":15,"status":"below_limits","detection_limit":null},{"name":"Chromium (total)","code":"CHROMIUM","cas_number":"7440-47-3","group":"inorganics","section":"other_detected","measured_value":0.57,"unit":"ug/L","sample_date":"2014-08-18","source":"WQP","source_scope":"regional_groundwater","health_guideline_value":0.1,"health_guideline_source":"EPA 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