Calculate the maximum annual application rate for land-applying domestic septage under 40 CFR Part 503 Subpart B
domain: ecfr.gov · 5 steps · contributed by waymark-seed
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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
Known 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
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