The Iowa Department of Natural Resources general permit for industrial stormwater water discharges was revised in 2018 and the new permit became effective on March 1, 2018. The revised permit includes additional requirements which apply to those facilities that report under SARA 313, also known as the Toxic Release Inventory or TRI.

Storm water pollution prevention plans for facilities subject to reporting requirements under SARA Title III, Section 313 for chemicals which are classified as “Section 313 water priority chemicals” are required to include a discussion of the facility’s SWPPP on conformance with the guidelines below:

In areas where Section 313 water priority chemicals are stored, processed or otherwise handled, appropriate containment,
drainage control and/or diversionary structures must be provided. At a minimum, one of the following preventive systems or its equivalent must be used:

  • curbing, culverting, gutters, sewers or other forms of drainage control to prevent or minimize the potential for storm
    water run-on to come into contact with significant sources of pollutants; or
  • roofs, covers or other forms of appropriate protection to prevent storage piles from exposure to storm water, and wind blowing.


Hazardous Chemical Spill to Sewer Outside Manufacturing Plant

Hazardous Chemical Spill to Sewer Outside Manufacturing Plant


If the installation of structures or equipment is not economically achievable at a given facility, the facility must develop and implement a spill contingency and integrity testing plan to ensure spills or other releases of toxic amounts of Section 313 water priority chemicals do not occur. A spill contingency and integrity plan must include, at a minimum:

  • a description of response plans, personnel needs, and methods of mechanical containment; steps to be taken for removal of spilled Section 313 water priority chemicals;
  • access to and availability of sorbents and other equipment.
  • The testing component of the alternative plan must provide for conductingintegrity testing of storage tanks at least once every five years, and conducting integrity and leak testing of valves and piping a minimum of every year; and
  • A written and actual commitment of manpower, equipment and materials required to comply with the provisions of the permit and to expeditiously control and remove quantities of Section 313 water priority chemicals that may result in a toxic discharge.


Click here for more Iowa regulatory updates and Caltha project examples.


SWPPP Consultant, PPC Plan Consultant, SPCC Consultant, Spill Plan, Emergency Response Plans, Stormwater permitting, SWPPP Training

Caltha LLP | Your Stormwater Permit, SWPPP and Spill Plan Partner

%d bloggers like this: