Developing Local Limits for Industrial Wastewater Discharged into a Sewer System
Either as part of an approved pretreatment program or by themselves, local limits are an important step in protecting water quality. These limits apply to wastewater discharged from commercial and industrial facilities, that is all industrial users.
These limits are "local" because they are designed to protect a site-specific collection system, wastewater treatment plant, receiving water, and sludge.
How to Develop Local Limits
Submit a sampling plan at least 30 days prior to conducting the study. Please use the checklist linked here.
Follow these basic steps to develop technically based local limits (TBLLs):
Determine pollutants of concern.
Collect and analyze wastewater data.
Calculate maximum allowable loadings to the wastewater treatment plant.
Calculate maximum allowable industrial loadings.
Allocate the resulting TBLLs.
These Environmental Protection Agency (EPA) guidance documents show how to complete each step:
Getting Local Limits Approved
Approved pretreatment programs must submit local limits to the TCEQ's Pretreatment Program for approval. Our Guide for TBLLs Submittal and Pretreatment Program Package lists the items to submit local limits for approval.
The relevant rule for this approval process is Title 40 Code of Federal Regulations (40 CFR) Section 403.18.
How to Apply Local Limits
Publicly owned treatment works (POTWs) have the authority to enforce approved local limits under 40 CFR Subsection 403.5(d). These limits are to be enforced at the "end of pipe"—in other words, where the commercial or industrial facility's wastewater enters the POTW's collection system.
Contact us if you have any questions.