{"id":"ebc712e8-e02e-426d-b05d-c27f728940ce","task":"Investigate and remediate microbiologically influenced corrosion (MIC) found during internal piping assessment","domain":"NFPA 25 ch. 14, MIC investigation","steps":["Identify indicators consistent with MIC during a 5-year internal assessment or after a leak/pinhole failure: tuberculation, foul odor, black/orange biofilm, or pitting-type corrosion","Where MIC is suspected, expand sampling to additional locations, including low points and dead-legs, since MIC concentrates where water sits stagnant","Consider laboratory water/coupon sample analysis, per NFPA 25 annex guidance, to characterize the type and severity of microbial activity","Evaluate remediation options (chemical treatment, mechanical cleaning/flushing, pipe replacement, or a nitrogen-generator/corrosion-inhibitor retrofit for dry systems) based on severity rather than defaulting to full repipe","Report findings and the remediation recommendation to the owner as a deficiency requiring corrective action, since untreated MIC progresses to pipe failure"],"gotchas":["MIC in dry and preaction systems is often driven by trapped moisture from incomplete drainage or humid compressed air -- treating the corrosion without correcting the moisture source (grading, low-point drains, nitrogen inerting) results in recurrence","Standard water-quality/chlorine residual testing alone can miss MIC, since the responsible organisms are often anaerobic and live under existing biofilm rather than in the free water -- a coupon or biofilm-specific sample is often necessary","Aggressive chemical biocide treatment applied without an engineering evaluation can react with system materials or create disposal/discharge issues under local environmental rules"],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.686Z","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/ebc712e8-e02e-426d-b05d-c27f728940ce"}