{"schema_version":"1.2","pwsid":"WI2520202","system_name":"WATERFORD WATERWORKS","city":"WATERFORD","state":"WI","population_served":5368,"source_type":"GW","summary":"WATERFORD WATERWORKS serves approximately 5,368 people in WATERFORD, Wisconsin. Based on contaminant analyses from DNR, WQP, EPA ECHO, EPA UCMR5, 2 contaminants have been measured above federal EPA standards (MCL) and 6 exceed health-based guidelines. The most significant finding is Gross Alpha Radiation (excluding Radon and Uranium) at 29.3 pCi/L, which is 2x the EPA legal limit. 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":"1995-06-19","end":"2026-03-23"},"contaminants_tested":152,"contaminants_detected":26,"exceedances":2,"guideline_exceedances":6,"contaminants":[{"name":"Chlorine (free)","code":"0700","cas_number":null,"group":"disinfectants","section":"other_detected","measured_value":0.55,"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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UCMR5","url":"https://www.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring-rule"}],"pfas_combined_display":{"value":3.4,"unit":"ng/L","sample_date":"2026-03-02","note":"Legacy 2016 EPA Health Advisory combined PFOA+PFOS metric. Not a current MCL."},"well_counts":{"active":4,"retired":1,"facilities_synced_at":"2026-04-11T13:48:07.246Z"},"historical_wells":[],"has_only_historical_data":false,"pfas_hazard_index":{"value":0.131,"compounds_used":["PFHXS","PFBS"],"is_partial":true,"threshold":1,"components":[{"code":"PFHXS","value_ng_l":1.3,"hbwc_ng_l":10,"ratio":0.13},{"code":"PFBS","value_ng_l":2,"hbwc_ng_l":2000,"ratio":0.001}]},"tthm_lraa":[{"monitoring_point":"system_wide","value":8.78,"unit":"ug/L","quarters_used":["2022Q3","2023Q3","2024Q3","2025Q3"],"sample_count":8,"mcl":80,"exceeds_mcl":false}],"haa5_lraa":[{"monitoring_point":"system_wide","value":30.12,"unit":"ug/L","quarters_used":["2022Q3","2023Q3","2024Q3","2025Q3"],"sample_count":8,"mcl":60,"exceeds_mcl":false}]}