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That means that the United States is often behind the curve on banning harmful chemicals, such as the highly toxic pesticide pentachlorophenol.

Baxter property that drains into Amazon Creek contained levels of pentachlorophenol or copper above the threshold of the company’s pollutant discharge permit.

DEQ also noted arsenic in soil on the property and pentachlorophenol spreading in the aquifer under the neighborhood.

But pentachlorophenol and the copper formulas were lasting 60 years or longer.

Creosote and pentachlorophenol were both banned for residential uses in the late 1980s, although they can still be used for railroad ties, utility poles and some farm uses.