Yesterday, EPA released its effluent guidelines for construction sites. The guidelines establish the first national standard containing numeric limitations on stormwater discharges. The final standard imposed is 280 nephelometric turbidity units. It will apply to all construction sites greater than 20 acres in size as of 18 months following the effective date of the regulations (which will be 60 days after Federal Register promulgation) and sites larger than 10 acres 4 years after the effective date.
As expected, EPA did not take NRDC and Waterkeeper Alliance up on their suggestion that EPA impose post-construction controls. However, since EPA has already signaled that its long-term plan is to impose stormwater controls beyond the current universe of industry and construction sites, it seems at this point that broader stormwater regulation by EPA is more a question of when than whether.