{"schema_version":"1.2","pwsid":"WI2300140","system_name":"HOLY HILL APARTMENTS","city":"TWIN LAKES","state":"WI","population_served":32,"source_type":"GW","summary":"HOLY HILL APARTMENTS serves approximately 32 people in TWIN LAKES, Wisconsin. Based on contaminant analyses from DNR, EPA ECHO, 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 0.005725 mg/L, which is 28.6x the health guideline. Data is drawn from source-level compliance monitoring and covers 2018 through 2025. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2018-09-30","end":"2025-08-13"},"contaminants_tested":109,"contaminants_detected":4,"exceedances":0,"guideline_exceedances":1,"contaminants":[{"name":"Combined Radium (226+228)","code":"4010","cas_number":null,"group":"radionuclides","section":"other_detected","measured_value":0.123,"unit":"pCi/L","sample_date":"2021-02-04","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":"Lead (90th Percentile)","code":"PB90","cas_number":"7439-92-1","group":"lead_copper","section":"guideline_exceedance","measured_value":0.005725,"unit":"mg/L","sample_date":"2024-09-30","source":"EPA ECHO","source_scope":"federal_program","health_guideline_value":0.0002,"health_guideline_source":"OEHHA PHG","epa_mcl_value":null,"status":"exceeds_guideline","detection_limit":null},{"name":"Copper (90th Percentile)","code":"COPPER","cas_number":"7440-50-8","group":"lead_copper","section":"other_detected","measured_value":229,"unit":"ug/L","sample_date":"2024-09-11","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.3,"health_guideline_source":"OEHHA PHG","epa_mcl_value":null,"status":"below_limits","detection_limit":null},{"name":"PFBS (Perfluorobutane Sulfonate)","code":"PFBS","cas_number":"375-73-5","group":"pfas","section":"pfas","measured_value":0.332,"unit":"ng/L","sample_date":"2023-11-20","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null}],"sources":[{"name":"DNR","url":"https://apps.dnr.wi.gov/dwsportalpub"},{"name":"EPA ECHO","url":"https://echo.epa.gov/"}],"pfas_combined_display":null,"well_counts":{"active":1,"retired":0,"facilities_synced_at":"2026-09-05T13:11:48.807Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":{"value":0.0002,"compounds_used":["PFBS"],"is_partial":true,"threshold":1,"components":[{"code":"PFBS","value_ng_l":0.332,"hbwc_ng_l":2000,"ratio":0.0002}]},"tthm_lraa":[],"haa5_lraa":[]}