Erin Brockovich is to file a class-action lawsuit over black water coming from taps in Gardena.
Residents have complained their supply smells so foul their stomachs turn every time they turn on the faucet.
At a town hall meeting Thursday night Brockovic, who famously took on Pacific Gas and Electric Company over contaminated water, announced her plan to take on the Golden State Water Company (GSWC) on behalf of thousands of customers in Gardena, Hawthorne and Lawndale.
"(They have the) duty and obligation to provide clean safe… drinking water," Brokovic said. "I don't care what you have to do, do it."
GSWC has previously blamed sediments from aging pipelines for the problem.
A company statement said it is moving forward with maintenance plans to prevent any more issues with the clarity or smell of the water.
"We have made great progress and believe that continued collaboration without unnecessary distractions is the best approach," GSWC southwest general manager Katherine Nutting said. " We hope those attempting to enter the discussion now are doing so with the right intentions and not to advance their personal agendas."
NBC4 first reported the issue in February. Some residents claimed the water was to blame for recent health problems such as eczema and rashes.