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Why was the reverse osmosis part of the JWPP shut off?

The discharge from the reverse osmosis’ discharge contained too much selenium to be placed back into the environment. Selenium is a naturally occurring element that is removed by reverse osmosis and is concentrated in the discharge of concentrate from the treatment (i.e., water that does not pass through the treatment filter). After the JWPP opened, the amount of selenium discharged into Windmill Creek in the concentrate from reverse osmosis exceeded permitted levels, and a notice of violation was issued by the CDPHE.