Hazardous Waste Disposal

Drop-Off Location

As residents of the City of Twin Falls, you are a member of the Southern Idaho Solid Waste (SISW) district. That means you can dispose of such things as antifreeze, motor oil, batteries, and sharps by delivering them to the city's transfer station at:

2186 Orchard Dr. E.

Twin Falls, ID 83301

Household Hazardous Waste Program

The Household Hazardous Waste (HHW) program provides SISW the chance to divert household hazardous waste from directly entering the landfill. By running the program in accordance with policy, we reduce the potential of health hazards by processing the waste prior to final disposal in the landfill. We positively impact the environment by recycling used oil and antifreeze accepted in the program. Participation, acceptance and quantities are limited so employee awareness is crucial for a successful HHW program.

The HHW program has expanded over the years. When the program was implemented, it was limited to used oil, antifreeze, flammable and combustible liquids and rechargeable batteries. The HHW program has expanded by including corrosive waste; pesticides, herbicides and fertilizers; small amounts of mercury and the capture of freon. The HHW program has the ability to divert abnormal waste out of the municipal solid waste (MSW) stream and dispose of it properly, if needed.

Program Use Intentions

The SISW district's HHW program is intended to be used by non-commercial citizens living in the counties of the district. All hazardous waste generated by households during their normal course of activities is exempt from hazardous waste regulation. HHW can still be a detrimental threat to the environment as well as human health.

Accumulated quantities of hazardous waste from businesses will not be accepted as part of the district’s HHW program. Businesses that qualify as a Conditionally Exempt Small Quantities Generator (CESQG), which produce less than 25 gallons or 220 pounds of hazardous waste per month, should contact Josh Bartlome at Milner Butte Landfill to discuss disposal options.


Rechargeable batteries have many uses. Cell phone, laptop and MP3 player batteries are probably the most common types. Most batteries have some type of labeling to identify the metals used in the construction. The metal used in the battery determines the ability to recycle. Batteries shall be taped with masking tape on both positive and negative terminals at time of disposal. This must be done to avoid an explosion in the battery box.

Types Accepted

Southern Idaho Solid Waste (SISW) accepts a maximum of two pounds of each type of battery per customer, per visit, of the following:

  • Lithium-Ion (Li-ion)
  • Nickel-Cadmium (NiCd)
  • Nickel-Metal Hydride (NiMH)
  • Small-sealed Lead Acid (Pb)

Automotive batteries are also accepted and should be placed outside in the appropriate staging area either on a pallet or an old household hazardous waste (HHW) box designated to store auto batteries.


Antifreeze is extremely toxic. Less than three ounces of the material can kill animals and small children. Antifreeze should never be poured down storm or sewer drains. Disposal of antifreeze in such a manner can cause major problems for wastewater treatment facilities.

Used antifreeze can be recycled into a reusable product. The district’s Household Hazardous Waste (HHW) program will accept five gallons per visit, not to exceed 25 gallons per month. Commercial disposal is not acceptable, anything over our limits should be directed to the landfill.

The following link will redirect you to additional information regarding Southern Idaho Solid Waste.