Some of the most hazardous chemicals found in households come from pool maintenance. When getting your pool ready for the swimming season, HHWSTL would like to offer some recommendations.

  1. Check your chemicals to ensure that they were stored properly from last season. Wetted or damp chemicals can cause you some problems. These can be disposed of through the HHW program.
  2. Read all the manufacturer’s instructions before adding chemicals to your pool.
  3. Work in a well ventilated area.
  4. Wear appropriate personal protective equipment like gloves and eye protection.
  5. Never mix chlorine with any other pool chemical, especially other types of chlorine treatments. This can cause explosions and or fires.

For more information about pool chemical storage and disposal, please visit

New! North County Site Open for Reservations

HHWSTL is pleased to announce the opening of a second site in the regional HHW partnership.  Residents can now make a reservation to drop-off materials at the North County HHW Facility located at 4100 Seven Hills Drive, St. Florissant MO, 63033.  This facility was constructed on the grounds of the former Saint Louis County Department of Public Health North County Animal Shelter and offers the same services as the Lemay HHW Facility.

The sites will not be open at the same time.  When making your reservation, you will be asked to select either the North County or the Lemay facility.  The system will then give and available times for an appointment at that site. 

A little preparation now will save you a big headache later.

Fall is a time of year where a lot of HHW gets produced. Some of the most common HHW we see in the Spring are completely avoidable. Things like old gasoline from lawn mowers, and pool chemicals. Below are some tips on how you can reduce the amount of HHW you produce: 

Lawn and Gardening

Toward the end of the mowing season, buy smaller quantities of gas, use it up, or give it to a neighbor.

When ready to store the mower for the winter, add a fuel stabilizer to leftover fuel or completely drain into a clean safety can.

Store the fuel away from freezing temperatures and sources of heat and flame.

When mowing season returns, use old fuel in a ratio of 1:5 old to new.

Properly-stored lawn and garden products can be effectively used for many seasons. Read labels for storage requirements.  

Pool Chemicals

At the end of the pool season, always follow the label directions for storage. If stored properly, pool chemicals will last through the winter. In general:

Store pool chemicals in a cool, dry, well-ventilated place away from other household chemicals and ideally in a locked storage room.

Ensure lids are securly attached.

Store liquids below powders when on shelves.

Keep chemicals away from heat, flame, and sunlight.

Inventory chemicals when opening the pool next season and use older chemicals first.

Do not mix old chemicals with new ones, even if they are the same type.

Remember, we do not want to see you in the Spring!

The easiest way to handle HHW is to not create it in the first place! To help choose safer alternatives to HHW the EPA has introduced the "Safer Choice" label to help you find cleaning and other products that are safer for your family and the environment. Visit

Did the previous owner of your house leave paint thinner and pool chemicals?  Are you helping a parent move to a condominium and you have jars of hobby paint purchased in the Reagan administration?  Whatever the reason, many of us have hazardous products that are too old to use.  They just need disposal.  So- how does St. Louis Household Hazardous Waste (HHWSTL) work?