Industrial activities

Industrial activities
Traditionally, EPA has regulated storm water differently than point source discharges. Regulators recognized that it was easier to install new technology to reduce pollutant loading from a specific industrial process with a specific "end of pipe" discharge point. Storm water was much more unpredictable.

Therefore, U.S. EPA regulated storm water using general NPDES permits without specific numeric limits. Instead, the general permit would require the development of a storm water pollution prevention plan (SWPPP) which required companies to institute "best management practices" (BMPs) to reduce pollution from run-off. The effectiveness of BMPs were evaluated by monitoring pollutant levels in run-off. but permits did not contain specific numeric effluent limits that had to be met.

EPA recognized the difficulties in trying to establish a numeric effluent limit for storm water discharges due to the variables involved. For instance, due to the variability of the size and nature of storm events, the amount of pollutant leaving a site in run-off was difficult to evaluate.

In 2002, EPA issued guidance that stated numeric limits would only be used "rarely" in storm water NPDES permits. However, EPA believe technology has improved and has signaled a shift toward numeric limits for storm water control. In 2010, EPA issued a controversial revision to that guidance indicated numeric values may be appropriate. (See, "Guidance on Establishing TMDL Waste Load Allocations for Storm Water Discharges in NPDES Permits" EPA November 2010)

Benchmarks Versus Numeric Limits

The first step toward numeric limits is EPA's use of "benchmarks" in storm water permits. EPA makes clear that benchmarks are not effluent limits. This means an exceedence of the numeric value is not a violation. However, the exceedence is evidence that BMPs need to be improved to reduce pollutant loading.

First, the permit contains industry specific requirements (which is why the permit is 141 pages long). Second, it uses benchmarks tied to specific industrial activity that will be used to determine the effectiveness of BMPs.

Ohio EPA's new General Permit became effective starting January 1, 2012. However, facilities will still be covered by their old general permits, as long as they are still effective. Existing facilities will begin the transition to the new permit upon notification from Ohio EPA.

Ohio EPA will send written instructions to existing covered facilities on how to continue their general permit coverage with the submittal of a “re-notification” of intent to be covered. The existing facility will have 90 days to submit the re-notification.

Benchmark Monitoring

The new permit is effective for five years. During the first four years of the permit, facilities to which the industry specific benchmarks apply, will monitor their compliance with the benchmarks.


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