Every limit you place on an industrial discharger has to survive a technical challenge — from the Approval Authority, from a permittee’s consultant, sometimes from a judge. LocalLimitsHQ runs the back-calculation, shows every assumption, and hands you the submittal package.
No spreadsheet macros. No lost formulas. Every number traces to its source.
It works, until someone asks why. The workbook that most programs inherited has one column per pollutant, hard-coded criteria that quietly went out of date, and no record of who decided what.
A local limit is a derived number. Start from the criterion that protects the receiving water, the biology, the biosolids, or the crew — then trace it back through the plant to the sewer.
Flows, receiving water, dilution factors from your NPDES fact sheet, biosolids pathway, digester.
Influent, effluent, and biosolids sampling. Removal efficiencies come out of your own data, not a table.
Six protection pathways run at once. The most restrictive sets the headworks loading — and says so.
Divide the industrial loading across your permitted users, then export the package with its full basis.
Local limits are not a one-time deliverable. The obligation to develop them is continuous, and the obligation to re-justify them arrives with every permit cycle. That is the work we carry.
Programs must develop and enforce specific limits on prohibited discharges, and continue to revise them as necessary. Programs without approved pretreatment programs must develop limits where pollutants from non-domestic sources cause interference or pass through that is likely to recur.
A written technical evaluation of the need to revise local limits is required following permit issuance or reissuance. Re-evaluation is also warranted when plant performance, influent character, or the applicable criteria change materially.
One subscription covers the whole program — unlimited studies, unlimited industrial users, and criteria updates as they are promulgated. Every plan includes the full audit trail.