Disposing of old paint, bleach, oil, and fertilizer should be handled by a company that specializes in this kind of waste. Many private junk removal companies do not dispose of these items. Because these materials are hazardous to the environment and dangerous to handle or dispose of improperly, you should confirm with your local municipality about places to take hazardous materials for safe disposal. 

According to the Environmental Protection Agency (EPA), hazardous waste is generally classified into four main categories:

1. Characteristic Wastes: These exhibit at least one of four hazardous traits: ignitability (flammable, like gasoline), corrosivity (can rust or decompose materials, like car batteries), reactivity (unstable and can explode, like aerosol cans), or toxicity (harmful when ingested, like lead-based paint).

2. Listed Wastes: These are specific wastes from manufacturing and industrial processes that the EPA has officially designated as hazardous. They include byproducts from processes that use solvents, pesticides, and other chemicals.

3. Universal Wastes: These are commonly generated hazardous items that are subject to streamlined regulations. Examples include batteries, pesticides, mercury-containing equipment (e.g., bulbs), and some lamps.

4. Mixed Wastes: This category includes waste that contains both hazardous and radioactive components, making it subject to regulation by both the EPA and the Nuclear Regulatory Commission.

Chlorine has a shelf life of between six months and several years, depending on its type and formulation. Liquid chlorine can often lose its effectiveness in just a few weeks. Pool owners can find themselves with overstock that they need to get rid of. The best way to dispose of excess chlorine is to take it to a hazardous waste collection site and let the pros handle it.  

The EPA enforces hazardous waste laws and ensures people dispose of their hazardous waste responsibly. Depending on where you live, your state’s hazardous waste regulatory agency may also enforce these laws. Individually, it’s up to each household to properly dispose of their hazardous waste.