June 13 2018

State Fire Marshal Offers Pool Chemical Safety Tips


With the warm weather finally here local pool owners will be hard at work trying to get their water a nice blue rather than a slimy green. However, the chemicals used to treat pool water can be dangerous if not handled properly.


State Fire Marshal Peter J. Ostroskey wants pool owners to take a moment to make a pool chemical safety plan and share it with family members.


“Pool chemicals may become a hazard when they get damp or wet with a small quantity of water or when they are improperly mixed with each other, other chemicals or reactive materials,” He said. “It is important to keep pool chemicals dry. Store them in separate containers with lids in a locked shed away from the house and pool.”


Ostroskey said improper use and storage of these chemicals lead to emergency responses every year. For example, The State Hazardous Materials team was recently called to a home in Sharon where pool chemicals were being mixed inside and when they got wet, began to create dangerous chlorine vapors. Two people were taken to the hospital after breathing in the chlorine gas


“Local fire departments and hazardous materials teams often respond to emergencies involving swimming pool and hot tub/whirlpool chemicals,” he said. “The potential costs incurred by the pool owner for emergency measures can be extremely expensive. Take the necessary measures to prevent or address any injury to people or harm to the environment.”


Every year more than 5,000 people nationwide are sent to the hospital with pool chemical related injuries, the Fire Marshal’s office said.

Residents should take care and follow these safety tips:


- Read and follow the manufacturer’s instructions very carefully. Make sure when you dispose of chemicals that you follow the directions provided.

- Children should never handle pool chemicals, and even teenagers should not be allowed to do so without constant adult supervision.

- Put a lid on chemical containers every time. When containers are left open, water can get in and react with the chemicals. Remember: powder in the water, not water in the powder.

- Clean tools and equipment used to handle one chemical properly before using them with a different chemical.

- Spilled substances (e.g., from damaged containers or from sloppy handling) must be cleaned up and disposed of properly to avoid creating an inadvertent mixing or chemical reaction.


Liquid chemicals, such as sodium hypochlorite (bleach), if spilled, can leak into other containers or seep into cracks in the floor, the release states. Liquids, because of their properties, can create hazards not associated with solid or granular products and must be carefully handled.

Mixing chemicals can lead to a chemical reaction that may generate temperatures high enough to ignite nearby combustible materials. Mixing can also lead to the release of highly toxic and corrosive chlorine gas.


“A few years ago, a man mixing pool chemicals in his attached garage created a chlorine gas cloud in his family’s home that took firefighters several hours to dissipate,” Ostroskey said.  

Proper pool chemical storage is important, the release says. Pool owners should conduct a review of how they store their pool chemicals and especially look for and correct situations where chemicals could be intentionally or accidentally mixed. Make sure to:


- Separate incompatible substances; avoid storing containers of liquids above containers of other incompatible substances. The most common pool chemicals are inherently incompatible with each other, so be sure to keep them apart.

- Avoid mixing old chemicals with fresh chemicals, even if they are the same type.

- Use separate, designated scoops for each chemical. Handle only one chemical at a time and make sure that tools used with one substance are not used with another unless all residues are removed.

- Use separate, designated containers for cleanup of spilled materials to avoid inadvertent mixing of spilled substances. Consult your local hazardous waste disposal facility for more detailed information on proper waste disposal.

- Store pool chemicals outside the home or attached garage; a locked stand alone shed is recommended.

- Lock your storage area to keep children, pets and unauthorized users out.

- Keep your storage area free of rags, trash, debris, or other materials that could clutter the hazardous material area. Keep combustible and flammable substance away from the area.

Proper Chemical Disposal


“Also, do not dispose of old pool chemicals in the trash or down the drain,” the release from the Fire Marshal says. “Take old chemicals to a household hazardous waste collection day in your community or to a commercial hazardous waste facility. Since sodium hypochlorite (bleach) is the same chemical used in most water treatment facilities, check to see if your local plant will accept the chemical.”

For more information about how to store and use pool chemicals safely visit the MassDEP web site or the U.S. Environmental Protection Agency site. Pool chemical manufacturers’ websites would also be helpful.


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