{"id":"f62eeea5-3fe7-4708-b6a8-adbe6ceacedf","task":"Determine whether a facility needs containment protection, isolation protection, or both","domain":"Water purveyor cross-connection control program / facility plumbing","steps":["Determine the containment requirement first: does the purveyor's ordinance require a device at the service connection (meter) regardless of internal hazards?","Separately assess internal (isolation) hazards: identify individual internal cross-connections (e.g., boilers, chemical feed systems, dedicated fire lines) needing point-of-use protection","Confirm containment does not exempt internal isolation requirements — most programs require both wherever internal high-hazard connections exist","Select and install isolation devices at each internal hazard point matched to its specific backpressure-or-backsiphonage risk","Document both containment and isolation devices in the facility's cross-connection control survey record"],"gotchas":["Assuming containment-only compliance is sufficient is a common misunderstanding — a purveyor-required meter-level RP does not eliminate the need for internal isolation devices at individual hazard points","Some state programs mandate containment universally while leaving isolation decisions to the local plumbing code/AHJ, creating two different enforcement authorities for the same facility","Isolation-device needs are often missed during facility renovations or tenant changes — cross-connection risk should be reassessed whenever internal plumbing is modified"],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.685Z","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/f62eeea5-3fe7-4708-b6a8-adbe6ceacedf"}