Toxaphene
Toxaphene·Affects brain, liver, kidneys
A chlorinated insecticide once heavily used on cotton, banned in 1990 but persistent in soil, sediment, and fish for decades.
Toxaphene
EPA limit
0.003 mg/L (MCL)
Most at risk
Well-water households in former cotton regions, communities near contaminated sediment
Found in
City water · Well water
AquaOx filters
YesActivated coconut shell carbon
What it does to you
Health effects
Toxaphene is classified by the EPA as a likely human carcinogen, with animal studies showing liver tumors at chronic exposure. The IARC classifies it as possibly carcinogenic to humans (Group 2B).
The nervous system, liver, and kidneys are the documented target organs. Acute exposure causes neurological symptoms including tremors and seizures because toxaphene disrupts GABA receptor function in the brain. Chronic exposure damages the liver and kidneys.
Toxaphene bioaccumulates in fat tissue and biomagnifies up aquatic food chains, which is why state fish-consumption advisories still exist for some lakes and rivers decades after the ban. Subsistence anglers in contaminated watersheds face the highest exposure.
Where it comes from
How it gets into your water
Toxaphene was the most heavily used insecticide in the US during the 1970s, with peak applications on cotton across the Southeast, Texas, and California. The EPA banned it in 1990, but the compound is extremely persistent: half-lives in soil and sediment span decades.
Legacy contamination persists in former cotton-growing regions and downstream sediments. The compound slowly volatilizes and re-deposits, which is how it ended up in Arctic wildlife thousands of miles from any application site. Drinking water contamination is rare but documented near contaminated sediments and former application areas.
Former cotton-growing regions
Legacy soil contamination in the Southeast and Texas
Contaminated sediments
Persists in lake and river sediment for decades
Shallow groundwater near legacy sites
Slow leaching from contaminated soil
Bioaccumulation in fish
State advisories still active in some watersheds
Find out for yourself
Is it in your water?
Public utilities test for toxaphene under the EPA's primary drinking water regulations and report results in the annual Consumer Confidence Report. Detections in modern city water are rare.
Well-water households in former cotton regions should consider periodic testing for organochlorine pesticides as a group, which catches toxaphene, chlordane, heptachlor, and DDT-family compounds together. State environmental agencies can advise on local contamination history.
The fix
How AquaOx filters it
Toxaphene is filtered efficiently by activated carbon. The coconut shell carbon stage in The AquaOx adsorbs organochlorine insecticides as water passes through the bed, with independent testing showing reductions well above 90%.
For well-water households in regions with legacy agricultural contamination, we recommend pairing The AquaOx with our FE or RE Edition if iron or hydrogen sulfide is also present, and adding the under-sink RO for additional drinking-water polish.