City of Blackfoot Sewer Department

Information for Businesses

There are a wide variety of businesses in the City of Blackfoot. Each business contributes to the sewer flow in a different way. It is important for each business to be aware of their role in keeping our waterways clean and safe. Every discharger into the City of Blackfoot Sewer System must follow the general discharge standards. Click here for general discharge standards. Listed below are business categories of concern in the City of Blackfoot.

Industrial and Manufacturing

Does your business not fit into the common retail, food, office operations? You may be considered a Categorical or Significant Industrial User descriptions. These are businesses that contain operations that have potential to disrupt the treatment plants ability to discharge clean water into the Snake River. Please read below to determine if you are, or planning to operate a business as described.


Categorical Users of the sewer system have additional regulations under the Clean Water Act. If your facility partakes in any of the following you may be considered a Categorical User.

  • Aluminum forming
  • Metal foundries 
  • Battery manufacturing 
  • Nonferrous metal manufacturing 
  • Coil coating 
  • Pesticide manufacturing 
  • Copper forming 
  • Petroleum refining 
  • Electrical/electronic components 
  • Pharmaceutical manufacturing 
  • Electroplating 
  • Circuit board manufacturing 
  • Porcelain enameling 
  • Iron/steel manufacturing 
  • Pulp/paper mills 
  • Leather tanning finishing 
  • Wood preserving 
  • Metal finishing 
  • Inorganic chemical manufacturing 
  • Centralized waste treatment

If you are currently discharging to the City please notify us immediately so that you can be permitted. If you plan to operate a business that conducts some of the above activities, you will need to turn in a completed Data Disclosure Form (DDF) to the City 90 days prior to operation. Click here to download a copy.

Significant Industrial User (SIU)

A Significant Industrial User is defined as:

  • An industrial user subject to Categorical Pretreatment Standards under 40CFR (Code of Federal Regulations), 403.6 and 40 CFR, Chapter I, subchapter N. Any industry that falls under these categories is considered a SIU whether it has process discharge to the sewer or not. These industries are Categorical Industrial Users (CIUs)
  • Any industry which discharges an average of 25,000 gallons per day or more of process wastewater to the sewer system (excluding sanitary, contact cooling and boiler blowdown wastewater)
  • Any Industry which is designated as such by the City of Blackfoot on the basis that the industrial user has a reasonable potential for adversely affecting the operation of the collection system or treatment plant, or violating any pretreatment requirement.

If you are currently discharging to the City and meet any one of the three definitions, please notify us immediately so that you can be permitted. If you plan to operate a business that meets any one of the above definitions, you will need to turn in a completed Data Disclosure Form (DDF) to the City 90 days prior to operation. Click here to download a copy.

City of Blackfoot Local Limits

The following pollutant limits are established to protect against pass through and interference. Local Limits are evaluated annually to assess ability to protect treatment works. No person shall discharge wastewater containing in excess of the following daily maximum allowable discharge limits:

Parameter Limit
pH 5.0 – 12.0 SU
Arsenic (As) 0.03 mg/L
Cadmium (Cd) 0.0372 mg/L
Chromium (Cr) 0.7403 mg/L
Copper (Cu) 0.6456 mg/L
Cyanide (CN) 0.2835 mg/L
Lead (Pb) 0.3372 mg/L
Mercury (Hg) 0.008 mg/L
Nickel (Ni) 0.6277 mg/L
Oil & Grease (Non-Polar) 200 mg/L
Silver (Ag) 0.43 mg/L
Zinc (Zn) Allocated to Industry in Permit By Mass Proportion Method

The above limits apply at the point where the wastewater is discharged to the POTW (end of the pipe). All concentrations for metallic substances are for "total" metal unless indicated otherwise. The Superintendent may impose mass limitations in addition to (or in place of) the concentration-based limitations above. Where a user is subject to a categorical pretreatment standard and a local limit for a given pollutant, the more stringent limit or applicable pretreatment standard shall apply.

High Strength User Fees

Industrial Users can place a heavier burden on the sewer system than a residential or commercial user. Our rates for these higher strength discharges are as follows:

  • Flow $1.27 per 1,000 gallons
  • BOD $0.24 per pound
  • TSS $0.24 per pound
  • Total Phosphorus $0.27

Restaurants/Food Service Establishments (FSE)

The City of Blackfoot has a variety of restaurants to choose from. While the food differs, the responsibility remains the same. Each restaurant must have an operational Grease Removal System (GRS). The two main types of GRS’s are grease traps and grease interceptors. These devices separate the solids, oils, and greases that are found when discharging from food preparation and cleanup. If these devices are not maintained properly, your pipes and the City’s pipes suffer. Grease traps must be cleaned once a week, with a signed record. Grease interceptors must be cleaned and pumped empty once every three months, with receipt of cleaning stored for three years on premises. FSE’s that cause a blockage of sewer pipes will be liable for any damages.

Septage Haulers

The City of Blackfoot accepts waste from permitted septage haulers. The accepted waste is limited to domestic waste and portable toilet waste. To discharge at the treatment plant, a septage hauler permit is required. An application can be found by clicking here and must be completed and turned in 30 days prior to discharge. The City of Blackfoot septage hauler permits last for one calendar year. Renewal applications must be completed and turned in 30 days prior to expiration. Each load must include a manifest including the name and address of the waste hauler, the name and signature of the driver, permit number, truck identification, sources of waste and volume and characteristics of waste, and if applicable the name and signature of the waste generator. An acceptable manifest can be downloaded by clicking here. The rate schedule can be found by clicking here.

Dental Offices

The City of Blackfoot has multiple dental offices. Each dental office must comply with newly passed dental discharge laws by the year 2020. These laws can be complied with by having an operational amalgam seperator with a 95% removal efficiency. These devices remove heavy metals, primarily mercury, from dental discharge waste. The removal of mercury is important since mercury is a potent neurotoxin that bioaccumulates in fish and shellfish. Once collected by the amalgam seperator, it is the responsibilty of the dental office to recycle the mercury waste. The dental office must also keep records pertaining to recycling amalgam waste for up to three years.

Car Washes

The City of Blackfoot has many car washes available to citizens to keep their cars clean. It is up to the owners and operators of those facilities to help keep the discharges from these operations clean. Each car wash is required to have a covered wash bay (roof) and an oil and water separator in each bay. These oil and water separators must not be allowed to accumulate sufficient solids to hinder their clarifying performance. When the volume of solids in an oil and water separator exceeds 25%, efficiency begins to decrease significantly.

Blackfoot Sewer Department
2025 Riverton Road
Blackfoot, Idaho 83221-2466

Phone: (208) 785-8616
Fax: (208) 785-8614

Hours of Operation
Monday – Friday
7:00 AM to 5:30 PM

Saturday & Sunday
7:00 AM to 4:00 PM