U.S. Attorney's Office - District of Oregon

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News Release

Troutdale Woman Pleads Guilty To Conspiracy To Violate The Clean Water Act For Discharging 500,000 Gallons Of Pollutants In Hillsboro (Photo) - 01/21/26

PORTLAND, Ore.—A Troutdale, Oregon, woman pleaded guilty today in federal court for conspiring to violate the Clean Water Act by receiving and discharging industrial wastewater from a facility in Hillsboro, Oregon, to a sanitary sewer system.

 

Kayla Hartley, 35, pleaded guilty to one count of conspiracy to violate the Clean Water Act.

 

According to court documents, from February through September 2020, Hartley, as the Director of Operations at the Northwest Slurry Solutions and Hydro Excavation, LLC (“Northwest Slurry”) facility in Hillsboro, marketed the company as able to accept and dispose of industrial wastewater, despite having no permit or authorization to discharge that type of waste. Under Hartley’s leadership, Northwest Slurry accepted approximately 500,000 gallons of industrial wastewater containing chemical pollutants including hydrofluoric acid, titanium, molybdenum, vanadium, arsenic, and other heavy metals. Northwest Slurry discharged those half-a-million gallons of pollution to the Hillsboro sanitary sewer.

 

When staff from Clean Water Services, which operates the sanitary sewer system in Hillsboro, visited Northwest Slurry’s facility, Hartley attempted to conceal the fact that her company was discharging industrial wastewater.

 

On July 15, 2025, a federal grand jury in Portland returned an indictment charging Hartley with conspiracy to violate and violating the Clean Water Act.

 

Hartley faces a maximum sentence of five years in prison, a $250,000 fine, and three years of supervised release. She will be sentenced on May 12, 2026, before a U.S. District Court Judge.

 

This case was investigated by the EPA Criminal Investigation Division with assistance from Clean Water Services. Assistant U.S. Attorneys Andrew T. Ho and William M. McLaren are prosecuting the case.

 

This case was an Environmental Crimes Task Force (ECTF) investigation. ECTF is an initiative in the District of Oregon that identifies, investigates, and prosecutes significant environmental, public lands, and wildlife crimes. ECTF leverages the resources and effort of federal, state, and local regulatory agencies and law enforcement to protect human health, safeguard natural resources and wildlife, and hold violators accountable. If you witness an event that may lead to an immediate threat to human health or the environment, please call 9-1-1. After alerting local emergency authorities, please also report incidents to the EPA’s Report a Violation website (https://echo.epa.gov/report-environmental-violations) or by calling the National Response Center at 1-800-424-8802.

 

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Attached Media Files: PDF Release,

Troutdale Woman Pleads Guilty To Conspiracy To Violate The Clean Water Act For Discharging 500,000 Gallons Of Pollutants In Hillsboro (Photo) - 01/21/26

PORTLAND, Ore.—A Troutdale, Oregon, woman pleaded guilty today in federal court for conspiring to violate the Clean Water Act by receiving and discharging industrial wastewater from a facility in Hillsboro, Oregon, to a sanitary sewer system.

 

Kayla Hartley, 35, pleaded guilty to one count of conspiracy to violate the Clean Water Act.

 

According to court documents, from February through September 2020, Hartley, as the Director of Operations at the Northwest Slurry Solutions and Hydro Excavation, LLC (“Northwest Slurry”) facility in Hillsboro, marketed the company as able to accept and dispose of industrial wastewater, despite having no permit or authorization to discharge that type of waste. Under Hartley’s leadership, Northwest Slurry accepted approximately 500,000 gallons of industrial wastewater containing chemical pollutants including hydrofluoric acid, titanium, molybdenum, vanadium, arsenic, and other heavy metals. Northwest Slurry discharged those half-a-million gallons of pollution to the Hillsboro sanitary sewer.

 

When staff from Clean Water Services, which operates the sanitary sewer system in Hillsboro, visited Northwest Slurry’s facility, Hartley attempted to conceal the fact that her company was discharging industrial wastewater.

 

On July 15, 2025, a federal grand jury in Portland returned an indictment charging Hartley with conspiracy to violate and violating the Clean Water Act.

 

Hartley faces a maximum sentence of five years in prison, a $250,000 fine, and three years of supervised release. She will be sentenced on May 12, 2026, before a U.S. District Court Judge.

 

This case was investigated by the EPA Criminal Investigation Division with assistance from Clean Water Services. Assistant U.S. Attorneys Andrew T. Ho and William M. McLaren are prosecuting the case.

 

This case was an Environmental Crimes Task Force (ECTF) investigation. ECTF is an initiative in the District of Oregon that identifies, investigates, and prosecutes significant environmental, public lands, and wildlife crimes. ECTF leverages the resources and effort of federal, state, and local regulatory agencies and law enforcement to protect human health, safeguard natural resources and wildlife, and hold violators accountable. If you witness an event that may lead to an immediate threat to human health or the environment, please call 9-1-1. After alerting local emergency authorities, please also report incidents to the EPA’s Report a Violation website (https://echo.epa.gov/report-environmental-violations) or by calling the National Response Center at 1-800-424-8802.

 

# # #

Attached Media Files: PDF Release,