{"id":"dafc14fe-ab51-428e-825f-dab13f2ccf6d","task":"Look up an approved backflow prevention assembly on the USC FCCCHR list before specifying or installing it","domain":"USC Foundation for Cross-Connection Control and Hydraulic Research (fccchr.usc.edu)","steps":["Go to fccchr.usc.edu/list.html and download the current approved-assemblies list in Excel, PDF, or web-app format","Filter by assembly type (DC, RP, DCDA, DCDA-II, RPDA, RPDA-II, AVB, PVB, or SVB)","Confirm manufacturer, model, size, and orientation match the physical assembly being specified or approved","Check the approval date and the latest renewal date — approvals run for a 3-year period and are subject to renewal","Cross-check against the specific local purveyor's own approved-products list, since purveyors often maintain a narrower subset of the full USC list"],"gotchas":["A USC approval lapsing at renewal doesn't retroactively decertify assemblies already installed, but it can block new installs of that exact model","The USC list is updated periodically; don't rely on a downloaded copy for more than a few months during active specification work","Local purveyors can restrict the USC list further — USC listing alone does not guarantee local plan-review approval"],"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/dafc14fe-ab51-428e-825f-dab13f2ccf6d"}