{"schema_version":"1.2","pwsid":"WI1110039","system_name":"PORTAGE WATERWORKS","city":"PORTAGE","state":"WI","population_served":10437,"source_type":"GW","summary":"PORTAGE WATERWORKS serves approximately 10,437 people in PORTAGE, Wisconsin. Based on contaminant analyses from DNR, WQP, EPA ECHO, EPA UCMR5, 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 0.0062 mg/L, which is 31x the health guideline. Data is drawn from source-level compliance monitoring and covers 1995 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"1995-06-12","end":"2026-03-19"},"contaminants_tested":104,"contaminants_detected":18,"exceedances":0,"guideline_exceedances":2,"contaminants":[{"name":"Chloromethane","code":"CHLOROMETHANE","cas_number":null,"group":"vocs","section":"other_detected","measured_value":0.46,"unit":"ug/L","sample_date":"2021-01-06","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null},{"name":"Naphthalene","code":"NAPHTHALENE","cas_number":null,"group":"vocs","section":"other_detected","measured_value":0.42,"unit":"ug/L","sample_date":"2023-05-15","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null},{"name":"Chlorine (total 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UCMR5","url":"https://www.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring-rule"}],"pfas_combined_display":{"value":0.606,"unit":"ng/L","sample_date":"2023-05-11","note":"Legacy 2016 EPA Health Advisory combined PFOA+PFOS metric. Not a current MCL."},"well_counts":{"active":4,"retired":3,"facilities_synced_at":"2026-04-11T13:48:07.246Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":{"value":0.7206,"compounds_used":["PFHXS","PFBS"],"is_partial":true,"threshold":1,"components":[{"code":"PFHXS","value_ng_l":7.2,"hbwc_ng_l":10,"ratio":0.72},{"code":"PFBS","value_ng_l":1.28,"hbwc_ng_l":2000,"ratio":0.0006}]},"tthm_lraa":[{"monitoring_point":"system_wide","value":9.75,"unit":"ug/L","quarters_used":["2023Q3","2023Q4","2024Q3","2025Q3"],"sample_count":9,"mcl":80,"exceeds_mcl":false}],"haa5_lraa":[{"monitoring_point":"system_wide","value":3.75,"unit":"ug/L","quarters_used":["2022Q3","2023Q3","2024Q3","2025Q3"],"sample_count":8,"mcl":60,"exceeds_mcl":false}]}