Toxic chemicals can be poured down the drain if you run plenty of water to wash them down.

We’ve all been there – using the drains in your home or business to instantly dispose of whatever substance you’re working with is extremely convenient. But when it comes to substances that are even remotely hazardous, you can unknowingly cause a great deal of harm by doing so. There are many negative effects of pouring chemicals down the drain, both short-term and long-term, that we need to prevent.

What is Hazardous Waste?

Hazardous waste is defined as any material that exhibits one of more of the following traits:

  • Toxicity
  • Corrosivity
  • Reactivity
  • Flammability

Hazardous waste and chemical waste aren’t necessarily the same thing. Chemicals aren’t always harmful – however, the impact they often have on the environment, especially when coming into contact with other chemicals, can ultimately be considered hazardous waste.

Materials That Should Never Get Put Down the Drain

Many people don’t realize the consequences of the harsh chemicals they dispose of. In order to keep the environment, specifically our water sources, clean and safe, these are materials that you should never wash down the drain:

  • Hazardous chemical waste (viscous, sludge or solids)
  • Bio-hazardous waste
  • Medical waste
  • Radioactive waste
  • Corrosive waste
  • Latex or oil paint
  • X-ray or photo processing chemicals
  • Pharmaceuticals
  • Formaldehyde
  • Formalin
  • Hydrogen peroxide
  • Grease or oil
  • Controlled substances

Short-Term vs Long-Term Environmental Effects

The impact hazardous waste has on the environment as we know it is enormous – air, water, soil and wildlife are all affected by human pollution.

The government does not take this lightly. In 2019 alone, there have been 37 environmental criminal cases sentenced by the U.S. Environmental Protection Agency (EPA) as an effort to prevent unwanted negative environmental effects. The effects that improper hazardous waste disposal has on the environment occurs in both short-term and long-term events.

Short-Term

The most critical short-term danger of pouring chemicals down the drain is water pollution. When poured down the drain, the impact chemicals have on our rivers, lakes, streams, and other water sources cause them to be unsafe for consumption by all living creatures.

Human health can deteriorate, leading to major health issues in areas where contamination is occurring – consider the effects of the 2014 water crisis in Flint, Michigan. Agriculture is also affected, with animals and plants becoming sick and dying when given contaminated water.

The short-term impact of dumping hazardous waste down the drain is irrevocable and substantial, but the long-term effects are even more alarming.

Long-Term

Long-term effects of putting hazardous waste down the drain are disturbing and extremely eye-opening. Some effects of human pollution caused by hazardous waste can include:

  • Cancer and disease in humans
  • Mercury and lead poisoning
  • Mutation in animals
  • Destruction of green space, waterways, and natural resources
  • Population decrease of insects, such as bees
  • Depletion of the ozone

There is a multitude of long-term effects that improper disposal of hazardous waste has on the environment and our wellbeing, many of which we don’t consider on a day-by-day basis. This doesn’t make the repercussions less important (or less real), so make sure you do your part for your company and the environment to handle waste disposal correctly.

Hiring a Third Party Waste Manager

Given the strict regulations by the federal government for the handling of hazardous waste disposal, you don’t want to make any mistakes. Hiring a qualified third party waste manager will save you time, money, and stress by assuring your waste is disposed of properly. While there is a cost upfront, save your business and the environment from the effects of pouring chemicals down the drain, especially dealing with repercussions from the government.

To learn about our waste management services, please contact us at MLi Environmental today!

Last Updated: June 29, 2021 10:12:21 AM PDT

Find out what kinds of liquids can go down UC San Diego drains.

Whatever goes down the drain ends up in the ocean, so the San Diego Metropolitan Wastewater Department strictly regulates sewer waste.

What can go down the drain

The only substances allowed down drains are those that meet all of the following criteria:

  1. Nonhazardous
    • No radioactive waste
    • No hazardous chemical waste
    • No untreated biohazardous waste
  2. Liquid
    • No solids, sludges, or viscous substances
  3. Will not interfere with sewage treatment operations
    • No corrosive pH levels
    • No grease or oil
    • No hot (150°F or higher) temperatures in volumes of more than 10 gallons

Click on a category below to find out if a substance is allowed to go down the drain.

Note: Protect drains from chemical spills — do not use sinks for chemical storage or secondary containment. Disposal of hazardous waste using sinks, intentional evaporation, or as regular trash is against the law. Campus laboratories must abide by strict state and federal waste disposal requirements. You may be held liable for violations of applicable laws.

Material Can it go down the drain? What to do with it
Biohazardous waste Solids: NO

Liquids: NO, unless they have been deactivated

Liquid biohazardous waste can be decontaminated and made suitable for drain disposal in 2 ways:
  • Deactivate with bleach (1 part bleach to 9 parts liquid waste) for 30 minutes before pouring it down the drain.
  • Occasionally, liquid waste is autoclaved. Do not add bleach in this case. Read Autoclaving Guidelines for Biohazardous Waste.

For chemical disinfection of liquid biohazardous waste, the only university-wide approved disinfectant for UC San Diego is bleach. If your laboratory wishes to inquire about the use of alternative disinfectants to inactivate liquid biohazardous waste, please send an email with the following information:

  • Material to be disinfected
  • Chemical to be used
  • Concentration of chemical
  • Contact time
  • Disposal method (sewering, hazardous waste pickup)

You will receive a response within five (5) working days regarding approval.

For more information and for disposal instructions for solid biohazardous waste, read How to Package and Dispose of Biohazardous and Medical Waste.

Controlled substances NO Read Controlled Substances: Managing Inventory for disposal procedures.
Radioactive waste NO Read How to Store and Dispose of Radioactive Waste for disposal instructions.
Hazardous chemical waste NO Read How to Identify Hazardous Chemical Waste for guidance on hazardous chemical waste determination. Follow appropriate disposal procedures.
Non-liquids Can it go down the drain? What to do with it
Solids, sludges, or viscous substances NO These items can obstruct the flow of sewage.
Powders and salts NO These items can obstruct the flow of sewage.
Corrosive pH levels Can it go down the drain? What to do with it
Corrosive waste with a pH between 2.0 and 5.0 NO, unless it has been adjusted You have 2 disposal options:
  • Adjust the pH to greater than 5.0 and less than 12.5 and then dispose of it down the drain.
  • Store and dispose of nonadjusted waste as hazardous chemical waste.
Corrosive waste with a pH of 2.0 or lower or pH of 12.5 or higher NO This kind of waste is always considered hazardous chemical waste.
Hot liquids Can it go down the drain? What to do with it
Hot, nonhazardous liquids (150°F or more) NO, unless in volumes of less than 10 gallons For 10 gallons or more of nonhazardous hot liquid:
  • Cool the liquid to below 150°F before pouring it down the drain.
Grease and oil Can it go down the drain? What to do with it
Grease and oil NO, unless the concentration is less than 500 mg per liter For higher concentrations:
  • Dispose of substances such as automotive oil, gear oil, and machinery grease as hazardous chemical waste.
  • Place substances such as vegetable oil, lard, or shortening in the regular trash.
Common questions Can it go down the drain? What to do with it
Alcohols NO, unless the concentration is nonhazardous Ethanol is nonhazardous in concentrations less than 24%. Dilution of higher concentrations of any alcohol is not allowed. For other alcohols:
Formalin and formaldehyde NO, unless the concentration is nonhazardous and does not contain methanol or other hazardous chemicals This concentration is nonhazardous and can go down the drain:
  • Formalin solutions containing less than 2.9% formaldehyde
Dilution of higher concentrations is not allowed. For higher concentrations:
  • Read How to Store and Dispose of Hazardous Chemical Waste.
Hydrogen peroxide NO, unless its concentration is less than 8% Dilution of higher concentrations is not allowed. For higher concentrations:
  • Read How to Store and Dispose of Hazardous Chemical Waste.
Photo and X-ray processor chemicals NO, unless it is spent photo developer not mixed with fixer For concentrated, unused processor chemicals and other spent solutions:
Other chemicals NO, unless the concentration is nonhazardous Some chemicals are hazardous in any concentration. Dilution of higher concentrations is not allowed.
Latex paint NO Read Latex Paint Disposal for disposal instructions.
Oil paint NO Read How to Store and Dispose of Hazardous Chemical Waste for disposal instructions.
Wash and rinse water NO, unless it has not been contaminated by hazardous materials or highly caustic, acidic, or toxic cleaning solutions Read Wash and Rinse Water Disposal for complete information.

Notice: Disposal of hazardous waste using sinks, intentional evaporation, or as regular trash is against the law. Campus laboratories must abide by strict state and federal waste disposal requirements. You may be held liable for violations of applicable laws.