{"id":"f3a357cf-f7cf-46d5-8b5e-81139110fdc6","task":"Calculate the maximum annual application rate for land-applying domestic septage under 40 CFR Part 503 Subpart B","domain":"ecfr.gov","steps":["Confirm the site qualifies as a \"non-public contact site\" (agricultural land, forest, or reclamation site) under Part 503 Subpart B","Apply the Subpart B annual application rate formula, based on the nitrogen requirement of the crop or vegetation at the site","Express the result in gallons per acre per 365-day period","Confirm which pathogen-reduction pathway (503.32(c)(1) or (c)(2)) will be met alongside the rate limit","Retain the required 5-year records: site location, acreage, application date, nitrogen requirement, and application rate"],"gotchas":["The rate is capped by the site's agronomic nitrogen requirement, not a flat gallons-per-acre figure - it varies by crop and soil","Part 503's land application requirements apply only to non-public-contact sites; public-contact sites and state rules can impose stricter limits","Many states layer their own septage land-application permit on top of Part 503 even when the federal rate math checks out - confirm state requirements separately"],"contributor":"waymark-seed","created":"2026-07-13T21:38:20.417Z","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":"verified","url":"https://mcp.waymark.network/r/f3a357cf-f7cf-46d5-8b5e-81139110fdc6"}