— AI STUDY • DRINKING-WATER BYPRODUCTS • FLORIDA

AI ranked 1,163 drinking-water byproducts. What does that mean for Florida?

By Jose Linan · Published September 15, 2026

Why does disinfecting water create new chemicals?

The same chlorine and chloramine that protect public water can also react with naturally occurring material in the source water. Those reactions create chemicals called disinfection byproducts, or DBPs.

Disinfection is essential. It controls bacteria, viruses and other organisms that can cause serious illness as water moves through a utility system. The challenge is balancing that protection with the byproducts that treatment can form.

EPA already regulates familiar groups including total trihalomethanes, or TTHM, and five haloacetic acids, or HAA5. Florida residents can find those results in the annual Consumer Confidence Report for the utility that serves their property.

What did the AI study find?

Researchers from Stevens Institute of Technology and Harvard T.H. Chan School of Public Health assembled experimental toxicity information for 227 disinfection byproducts. They used those data to train a machine-learning model across four laboratory endpoints, including cell damage, DNA damage and developmental effects in zebrafish embryos.

The model then predicted and ranked potential toxicity across 1,163 known or possible byproducts. Some unregulated chemical classes received predicted toxicity scores two to ten times higher than the regulated trihalomethane and haloacetic-acid classes used for comparison.

That makes the research useful as a priority list. Laboratory testing is slow and expensive; a screening model can help researchers decide which compounds deserve closer testing first.

Does this mean 1,163 chemicals are in your water?

No. The number describes the collection evaluated by the model—not what was found in one utility, one Florida community or one glass of water.

Which byproducts form, and at what levels, can depend on the disinfectant, naturally occurring organic material, source-water chemistry, temperature, treatment process, distribution system and how long water remains in that system.

The researchers highlighted iodinated and other unregulated classes as priorities for additional work. That scientific question can matter to coastal states, but this study did not establish that those compounds are present in a Florida water supply.

What does the study mean for Florida residents?

Florida utilities already monitor regulated disinfection byproducts and report TTHM and HAA5 results. Those utility-specific numbers—not a national predictive model—are the correct starting point for understanding local water.

The larger question raised by the research is whether additional byproducts deserve toxicology studies, better analytical methods or future monitoring. “Deserves more research” is not the same as “confirmed danger.”

To understand one public-water system, identify the correct utility, determine whether it uses chlorine or chloramine, and read its reported TTHM and HAA5 results. A citywide report still cannot describe every condition inside one building or at one faucet.

Can home filtration reduce disinfection byproducts?

Certain activated-carbon systems can reduce specific disinfection byproducts. Performance depends on the media, tank or cartridge size, flow rate, contact time, maintenance and the exact compound. A label that says “carbon filter” does not mean the product removes every DBP.

Some reverse-osmosis systems may reduce specific compounds when the exact model carries the relevant certified claim. A conventional water softener removes hardness minerals; it is not the treatment for chlorine, chloramine or disinfection byproducts.

Start with the utility report or an appropriate laboratory result, then match the equipment to a defined goal and a product's exact performance claim. A frightening headline is not enough information to size a treatment system.

What should residents do now?

1. Identify the utility printed on the water bill.
2. Open its current Consumer Confidence Report.
3. Find the reported TTHM and HAA5 results and their comparison limits.
4. Determine whether the system uses chlorine or chloramine.
5. If a specific property concern requires testing, choose an appropriate certified laboratory and the correct analysis before collecting the sample.
6. Match any treatment equipment to the verified result and an independently supported reduction claim.

The bottom line

AI gave researchers a faster way to decide which of 1,163 disinfection byproducts should move to the front of the laboratory line. The study did not find 1,163 chemicals in Florida tap water and did not issue a consumer warning.

Its importance is more forward-looking: drinking-water science is examining far more than the familiar regulated groups, and the next step is careful testing—not turning a prediction into a contamination claim.

Learn how to find TTHM and HAA5 in your utility report →

What do detected, compliant and safe actually mean? →

Find your Florida utility and official water report →