{"schema_version":"1.2","pwsid":"WI7372480","system_name":"MOSINEE EAST SYSTEM","city":"Mosinee","state":"WI","population_served":1046,"source_type":"GW","summary":"MOSINEE EAST SYSTEM serves approximately 1,046 people in Mosinee, Wisconsin. Based on contaminant analyses from DNR, EPA ECHO, 2 contaminants have been measured above federal EPA standards (MCL) and 3 exceed health-based guidelines. The most significant finding is PFOS (Perfluorooctane Sulfonate) at 46 ng/L, which is 11.5x the EPA legal limit. Data is drawn from source-level compliance monitoring and covers 2019 through 2026. Results reflect conditions at the point of collection (wells, treatment plants), not necessarily at the tap.","data_period":{"start":"2019-09-30","end":"2026-03-23"},"contaminants_tested":42,"contaminants_detected":22,"exceedances":2,"guideline_exceedances":3,"contaminants":[{"name":"Chlorine (free)","code":"0700","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":1.02,"unit":"mg/L","sample_date":"2026-03-23","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":"PFHpA (Perfluoroheptanoic 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Guideline","epa_mcl_value":0.08,"status":"below_limits","detection_limit":null},{"name":"Nitrate (as N)","code":"NITRATE","cas_number":"14797-55-8","group":"inorganics","section":"other_detected","measured_value":2.3,"unit":"mg/L","sample_date":"2025-04-07","source":"DNR","source_scope":"source_monitoring","health_guideline_value":10,"health_guideline_source":"EPA MCLG","epa_mcl_value":10,"status":"below_limits","detection_limit":null},{"name":"NEtFOSAA (N-Ethyl Perfluorooctane Sulfonamido Acetic Acid)","code":"NETFOSAA","cas_number":null,"group":"pfas","section":"other_detected","measured_value":1.4,"unit":"ng/L","sample_date":"2024-04-22","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null},{"name":"Nickel","code":"1036","cas_number":null,"group":"inorganics","section":"other_detected","measured_value":0.0016,"unit":"mg/L","sample_date":"2023-02-21","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.012,"health_guideline_source":"OEHHA PHG","epa_mcl_value":null,"status":"below_limits","detection_limit":null},{"name":"Barium","code":"BARIUM","cas_number":"7440-39-3","group":"inorganics","section":"other_detected","measured_value":0.05,"unit":"mg/L","sample_date":"2023-02-21","source":"DNR","source_scope":"source_monitoring","health_guideline_value":1,"health_guideline_source":"OEHHA PHG 2003 (hypertension 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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":28,"unit":"ug/L","sample_date":"2023-09-14","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":"PFNA (Perfluorononanoic Acid)","code":"PFNA","cas_number":"375-95-1","group":"pfas","section":"pfas","measured_value":0.58,"unit":"ng/L","sample_date":"2026-02-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0.01,"health_guideline_source":"EPA MCLG","epa_mcl_value":0.01,"status":"below_limits","detection_limit":null},{"name":"PFHxA (Perfluorohexanoic 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Sulfonate)","code":"PFBS","cas_number":"375-73-5","group":"pfas","section":"pfas","measured_value":1.7,"unit":"ng/L","sample_date":"2026-02-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":null,"health_guideline_source":null,"epa_mcl_value":null,"status":"detected","detection_limit":null},{"name":"PFOA (Perfluorooctanoic Acid)","code":"PFOA","cas_number":"335-67-1","group":"pfas","section":"legal_violation","measured_value":11,"unit":"ng/L","sample_date":"2026-02-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0,"health_guideline_source":"EPA MCLG","epa_mcl_value":0.004,"status":"exceeds_legal_limit","detection_limit":null},{"name":"PFOS (Perfluorooctane Sulfonate)","code":"PFOS","cas_number":"1763-23-1","group":"pfas","section":"legal_violation","measured_value":46,"unit":"ng/L","sample_date":"2026-02-04","source":"DNR","source_scope":"source_monitoring","health_guideline_value":0,"health_guideline_source":"EPA MCLG","epa_mcl_value":0.004,"status":"exceeds_legal_limit","detection_limit":null}],"sources":[{"name":"DNR","url":"https://apps.dnr.wi.gov/dwsportalpub"},{"name":"EPA ECHO","url":"https://echo.epa.gov/"}],"pfas_combined_display":{"value":57,"unit":"ng/L","sample_date":"2026-02-04","note":"Legacy 2016 EPA Health Advisory combined PFOA+PFOS metric. Not a current MCL."},"well_counts":{"active":3,"retired":0,"facilities_synced_at":"2026-04-11T13:48:07.246Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":{"value":0.1589,"compounds_used":["PFHXS","PFNA","PFBS"],"is_partial":true,"threshold":1,"components":[{"code":"PFHXS","value_ng_l":1,"hbwc_ng_l":10,"ratio":0.1},{"code":"PFNA","value_ng_l":0.58,"hbwc_ng_l":10,"ratio":0.058},{"code":"PFBS","value_ng_l":1.7,"hbwc_ng_l":2000,"ratio":0.0009}]},"tthm_lraa":[{"monitoring_point":"system_wide","value":21.83,"unit":"ug/L","quarters_used":["2022Q3","2023Q3","2024Q3","2025Q3"],"sample_count":4,"mcl":80,"exceeds_mcl":false}],"haa5_lraa":[{"monitoring_point":"system_wide","value":5.54,"unit":"ug/L","quarters_used":["2022Q3","2023Q3","2024Q3","2025Q3"],"sample_count":4,"mcl":60,"exceeds_mcl":false}]}