The North Texas Municipal Water District will present a water testing and quality update to the Plano City Council Tuesday evening.

The presentation is in response to recent social media posts made by environmental activist Erin Brockovich, city spokesperson Steve Stoler said in an email. Brockovich’s posts on her Facebook page criticize the district’s practice of using two disinfecting chemicals, chlorine and chloramine.

A group of area residents has organized to attend Tuesday’s city council meeting.

“We do have one of our … administrators who is going to be making a statement,” said Leigh Wilcox, one of the administrators for the group’s Facebook page. Wilcox added that attendees have the choice to make a statement if they would like, but they are not required to.

A description on the Facebook page for the event encourages attendees to “wear royal blue in unity for safer water.” Wilcox said Brockovich's comments encouraged her and others to organize to attend the Plano City Council meeting.

“[Brockovich] kind of was a catalyst to get the group moving and kind of get people to come together,” Wilcox said.

Brockovich claims the practice of using chlorine causes toxic byproducts to form in the water, including trihalomethanes, and that they are “just not yet regulated.”

The NTMWD published a press release March 15 saying their water is still safe to drink and their use of chlorine maintenance is in-line with federal standards.

“This is a safe and scientifically proven method to ensure that treated water remains safe as it moves throughout the distribution system,” said Mike Rickman, the deputy director of operations and maintenance at the NTMWD.

The presentation will take place Tuesday evening during the council’s preliminary open meeting at the Plano Municipal Center, 1520 K Ave.