Municipal Separate Storm Sewer Systems (MS4s and SMS4s) are not designed to accept, process and treat discharges containing high levels of pollutants. EPA studies indicate that these discharges degrade water quality and can threaten aquatic, wildlife and human health.
Coconino County is required to regulate any discharges that are not composed entirely of stormwater. These discharges are referred to as illicit discharges because they can contain heavy metals, toxics, oil and grease, solvents, nutrients viruses and bacteria.
Eighteen categories of non-stormwater discharges are exempt from regulation by the County as long as these are determined to not be significant contributors of pollutants to their SMS4s. The categories are:
Air conditioning condensation
De-chlorinated swimming pool discharges
Diverted stream flows
Emergency fire fighting activity discharges
Flows from riparian habitats and wetlands
Foundation and footing drains
Non-commercial charity and individual residential car washing
Potable water source discharges
Street wash water
Uncontaminated groundwater infiltration
Uncontaminated pumped groundwater
Water from crawl space pumps
Water line flushing
Examples of Illicit Discharges
Intentional or unintentional sewer discharging into storm drains
Industrial wastewater piping discharging into storm drains
Effluent from cracked or improperly functioning sanitary systems
Car wash wastewater
Oil, hydraulic fluid and radiator fluid spills, and improper disposal of each
Improper disposal and spills of paint, paint thinners, lab chemicals and wastes
Spills from roadway accidents
Improper disposal of household toxics including cleaners, herbicides, insecticides and pesticides
What Can You Do About Illegal Dumping or Discharges?
Never dump anything into the streets or down the storm drains. Pesticides, herbicides, pet wastes, leaking fluids from a vehicle, or household chemicals could all end up in our washes, streams and retention basins if proper care is not taken.
To report illegal dumping or discharges into streets, storm drains or washes, please call (928) 679-8886, then press 1 at any time to record your message. You may remain anonymous.