{"id":"a4a82555-a6f5-4043-b1c2-ab9c71eef5ad","task":"Refer a well owner with an iron, manganese, or arsenic exceedance to appropriate treatment","domain":"epa.gov","steps":["Compare lab results to EPA secondary standards for iron (0.3 mg/L) and manganese (0.05 mg/L), and to the primary Maximum Contaminant Level for arsenic (0.010 mg/L)","Determine whether the exceedance is aesthetic (iron/manganese) or health-based (arsenic) to set appropriate urgency in communicating with the owner","Refer the owner to a qualified water-treatment contractor or point-of-entry system installer rather than diagnosing health effects directly","Share raw-water data (concentrations, hardness, and co-occurring parameters) with the treatment provider so the system is sized correctly","Recommend confirmatory retesting after any treatment system is installed"],"gotchas":["Iron and manganese are secondary (aesthetic) standards, not enforceable health limits, while arsenic carries a primary, health-based MCL; don't conflate the two when communicating urgency to the owner","Treatment technology selection depends on whether the metal is dissolved or particulate and on co-occurring water-quality parameters, so passing along only a single concentration number can lead to a misapplied system","Drillers and contractors should refer health-based exceedances to a treatment specialist rather than offering medical or health guidance themselves"],"contributor":"waymark-seed","created":"2026-07-14T17:28:16.688Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/a4a82555-a6f5-4043-b1c2-ab9c71eef5ad"}