{"schema_version":"1.2","pwsid":"WI6100336","system_name":"CLARK CO HEALTH CARE CENTER","city":"Owen","state":"WI","population_served":510,"source_type":"GW","summary":"CLARK CO HEALTH CARE CENTER serves approximately 510 people in Owen, Wisconsin. Based on contaminant analyses from DNR, EPA ECHO, 1 contaminant has been measured above federal EPA standards (MCL) and 5 exceed health-based guidelines. The most significant finding is Tetrachloroethylene (PCE) at 6.3 ug/L, which is 1.3x the EPA legal limit. 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":"2017-09-30","end":"2026-04-01"},"contaminants_tested":89,"contaminants_detected":18,"exceedances":1,"guideline_exceedances":5,"contaminants":[{"name":"Chlorine (total residual)","code":"0700_TOTAL","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.4,"unit":"mg/L","sample_date":"2026-04-01","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 (free)","code":"0700","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.6,"unit":"mg/L","sample_date":"2026-04-01","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":1.71,"unit":"pCi/L","sample_date":"2026-03-04","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":"Uranium","code":"4006","cas_number":"7440-61-1","group":"radionuclides","section":"guideline_exceedance","measured_value":0.818,"unit":"ug/L","sample_date":"2026-03-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.0005,"health_guideline_source":"OEHHA PHG","epa_mcl_value":0.03,"status":"exceeds_guideline","detection_limit":null},{"name":"Combined Radium (226+228)","code":"4010","cas_number":null,"group":"radionuclides","section":"other_detected","measured_value":2.013,"unit":"pCi/L","sample_date":"2026-03-04","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":"Tetrachloroethylene (PCE)","code":"2987","cas_number":null,"group":"vocs","section":"legal_violation","measured_value":6.3,"unit":"ug/L","sample_date":"2025-07-29","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.00006,"health_guideline_source":"OEHHA PHG","epa_mcl_value":0.005,"status":"exceeds_legal_limit","detection_limit":null},{"name":"Total Xylenes","code":"2969","cas_number":"1330-20-7","group":"organic","section":"other_detected","measured_value":0.93,"unit":"ug/L","sample_date":"2025-07-29","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.5,"health_guideline_source":"WHO 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N)","top_contaminant_code":"NITRATE","max_value":16.2,"unit":"mg/L","classification":"above_mcl","mcl_or_phg_value":10,"mcl_or_phg_unit":"mg/L","validated_reason":null}],"has_only_historical_data":false,"pfas_hazard_index":null,"tthm_lraa":[{"monitoring_point":"system_wide","value":5.59,"unit":"ug/L","quarters_used":["2023Q2","2023Q4","2024Q3","2025Q3"],"sample_count":5,"mcl":80,"exceeds_mcl":false}],"haa5_lraa":[{"monitoring_point":"system_wide","value":2.45,"unit":"ug/L","quarters_used":["2023Q2","2023Q4","2024Q3","2025Q3"],"sample_count":5,"mcl":60,"exceeds_mcl":false}]}