No person shall directly or indirectly discharge nonstormwater to the drainage system except where such discharges satisfy one of the following three (3) conditions:
A. The nonstormwater discharges are in compliance with a separate NPDES permit, provided that the discharger is in full compliance with all requirements of the permit, waiver, or order and other applicable laws and regulations, and provided that written approval has been granted by the city for any discharge to the storm drain system.
B. The nonstormwater discharges result from a spill and are the result of an unusual and severe weather event where reasonable and prudent measures have been taken to minimize the impact of such discharge; or consist of emergency discharges required to prevent imminent threat to human health or severe property damage, provided that reasonable and prudent measures have been taken to minimize the impact of such discharges.
C. The nonstormwater discharges satisfy all of the following conditions:
1. The discharges consist of uncontaminated water line flushing; potable water sources; landscape irrigation (provided all pesticides, herbicides and fertilizer have been applied in accordance with the manufacturer's instructions); flows from riparian habitats and wetlands; diverted stream flows; springs; rising groundwater; uncontaminated groundwater infiltration (as defined at 40 CFR 35.2005(20)) to separate storm sewers; uncontaminated pumped groundwater or spring water; foundation and footing drains (where flows are not contaminated with process materials such as solvents); uncontaminated air conditioning or compressor condensate; water from crawl space pumps; individual residential car washing; dechlorinated swimming pool discharges; routine external building wash down which does not use detergents; street and pavement wash waters, where no detergents are used and no spills or leaks of toxic or hazardous materials have occurred (unless all spilled material has been removed); fire hydrant flushing; dye testing: or flows from emergency firefighting activities; and
2. The discharges are not sources of pollution to waters of the United States, as described in IDAPA 58.01.02.200. For purposes of this provision, a discharge is considered a source of pollution to waters of the United States if it:
a. Contains hazardous materials in concentrations found to be of public health significance or to impair beneficial uses in receiving waters (hazardous materials are those that are harmful to humans and animals from exposure, but not necessarily ingestion);
b. Contains toxic substances in concentrations that impair designated beneficial uses in receiving waters (toxic substances are those that can cause disease, malignancy, genetic mutation, death, or similar consequences);
c. Contains deleterious materials in concentrations that impair designated beneficial uses in receiving waters (deleterious materials are generally substances that taint edible species of fish, cause taste in drinking waters, or cause harm to fish or other aquatic life);
d. Contains radioactive materials or radioactivity at levels exceeding the values listed in 10 CFR part 20 in receiving waters;
e. Contains floating, suspended, or submerged matter of any kind in concentrations causing nuisance or objectionable conditions or in concentrations that may impair designated beneficial uses in receiving waters;
f. Contains excessive nutrients that can cause visible slime growths or other nuisance aquatic growths that impair designated beneficial uses in receiving waters;
g. Contains oxygen demanding materials in concentrations that would result in anaerobic water conditions in receiving waters; or
h. Contains sediment above quantities specified in IDAPA 58.01.02.250.02(e) or in the absence of specific sediment criteria, above quantities that impair beneficial uses in receiving waters; or
i. Contains material in concentrations that exceed applicable natural background conditions in receiving waters (IDAPA 58.01.02.200.09). Temperature levels may be increased above natural background conditions when allowed under IDAPA 58.01.02.401. (Ord. 3455, 2012)