Erin Brockovich's Fight Against a Toxic Water Scandal: The Legacy of Hinkley

Erin Brockovich’s fight against the Pacific Gas and Electric Company (PG&E) represents a landmark moment in environmental law and consumer advocacy. By uncovering the systematic contamination of groundwater in Hinkley, California, with carcinogenic Hexavalent Chromium, Brockovich and the firm Masry & Vititoe secured a record-breaking $333 million settlement in 1996, forever changing how corporations are held accountable for toxic negligence.

The Roots of the Hinkley Groundwater Contamination

The story of the Hinkley water scandal began decades before the legal battle reached a courtroom. In 1952, the Pacific Gas and Electric Company (PG&E) established a compressor station in Hinkley, a small town in the Mojave Desert. This station was a critical link in a natural gas pipeline connecting Texas to California. To maintain the efficiency of the massive cooling towers used at the facility, PG&E utilized Hexavalent Chromium (also known as Chromium-6 or Cr(VI)) as a corrosion inhibitor.

Hexavalent Chromium is highly effective at preventing rust in industrial machinery, but it is also a potent toxin. At the Hinkley facility, the cooling water treated with this chemical was routinely discharged into unlined wastewater ponds. Without a barrier to prevent seepage, the toxic water filtered through the desert soil and entered the local aquifer. This aquifer was the primary source of drinking water for the residents of Hinkley, as well as the water used for their livestock and crops.

By the time the contamination was identified, a massive "plume" of Hexavalent Chromium had migrated through the groundwater. This plume was several miles long and approximately a mile wide, centering on the residential areas surrounding the compressor station. For decades, the families of Hinkley bathed in, drank, and cooked with water containing levels of Chromium-6 that were hundreds of times higher than natural background levels.

The Discovery: From Real Estate to Environmental Litigation

The exposure of this scandal was not the result of a government investigation or a corporate whistleblower, but rather the persistence of a legal clerk. In 1992, Erin Brockovich was working as a file clerk for the law firm Masry & Vititoe. While organizing a pro bono real estate case involving PG&E and a Hinkley resident named Donna Jensen, Brockovich noticed medical records tucked into the file.

Confused as to why a real estate transaction would include blood test results and medical histories, Brockovich began to investigate. She discovered that many residents of Hinkley suffered from a bewildering array of chronic illnesses, including rare cancers, respiratory failure, Crohn’s disease, and recurring miscarriages. Despite these health crises, PG&E had managed to maintain a narrative that the "chromium" they used was a helpful mineral supplement.

Brockovich’s investigation revealed a crucial distinction that the residents were unaware of: the difference between Trivalent Chromium ($Cr(III)$), which is an essential nutrient in small doses, and Hexavalent Chromium ($Cr(VI)$), which is a known human carcinogen. Armed with this knowledge, she and attorney Ed Masry began building a mass tort case against one of the largest utility companies in the United States.

Understanding Hexavalent Chromium: The Chemical Threat

To understand the severity of the fight, one must understand the chemical at its center. Chromium is a naturally occurring element, but its chemical state determines its toxicity. In Hinkley, the concentration of the hexavalent form was the primary concern.

Research conducted by the International Agency for Research on Cancer (IARC) and the Environmental Protection Agency (EPA) has since solidified the understanding that Chromium-6 is toxic to humans. While the industry argued in the 1990s that Chromium-6 was neutralized by stomach acid upon ingestion, subsequent studies indicated that it could survive the digestive process and damage DNA, leading to cellular mutations and malignancy.

The Legal Battle: Masry & Vititoe vs. PG&E

The lawsuit, Anderson, et al. v. Pacific Gas and Electric Co., was filed in 1993. It eventually represented 634 plaintiffs. The legal strategy employed by Masry & Vititoe was ambitious. They sought to prove that PG&E was not only negligent in its disposal of toxic waste but that it had engaged in a conscious cover-up of the risks posed to the community.

The plaintiffs' team documented that PG&E officials were aware of the contamination as early as 1965. Furthermore, the company had distributed flyers to Hinkley residents claiming the water was safe and that the chromium used was actually beneficial to their health. This evidence of deception was critical in overcoming the legal hurdles associated with proving "toxic torts," where establishing a direct causal link between a specific chemical and a specific cancer can be difficult.

To manage the massive scale of the litigation, the parties agreed to a private, binding arbitration. This avoided a jury trial, which could have taken years to resolve. The arbitration process was grueling, involving thousands of pages of medical testimony and environmental data.

The 1996 Settlement and Distribution

In 1996, the arbitration resulted in a settlement of $333 million. At the time, it was the largest settlement ever paid in a direct-action lawsuit in U.S. history. While the headline figure was staggering, the distribution of the funds was complex:

1. Legal Fees and Expenses: A significant portion of the settlement (roughly 40%) went toward legal fees and the immense costs of the multi-year investigation.
2. Plaintiff Payouts: The remaining funds were distributed among the 634 plaintiffs based on the severity of their illnesses and their proximity to the contamination plume.
3. Remediation Requirements: Beyond the cash settlement, PG&E was required to clean up the groundwater and cease the use of the unlined ponds.

The settlement provided financial relief to many suffering families, but it could not restore the health of those who had already been diagnosed with terminal conditions. For many in Hinkley, the "victory" was bittersweet, as the town itself began to decline.

The Aftermath: Hinkley’s Current Status in 2026

As of 2026, the legacy of the Hinkley scandal remains a cautionary tale of environmental neglect. Following the settlement, PG&E began an aggressive program of property buyouts. Many residents took the money and left, leading to the abandonment of homes and businesses. Today, Hinkley is often described as a "ghost town," with its population having dwindled to a fraction of what it was in the early 1990s.

The environmental cleanup is an ongoing process. Remediation of groundwater is notoriously slow and difficult. PG&E has employed various techniques over the last three decades, including:

• Agricultural Reuse: Pumping contaminated water and using it to irrigate crops (like alfalfa) that can naturally convert Chromium-6 into the less harmful Trivalent Chromium.
• In-situ Bioremediation: Injecting ethanol into the groundwater to stimulate bacteria that neutralize the toxic chromium.
• Monitoring: Maintaining a vast network of test wells to ensure the plume does not migrate further into the Mojave River.

Despite these efforts, the "background levels" of chromium in the area remain a point of contention between the remaining residents and the utility company.

Modern Regulatory Standards for Chromium-6

Erin Brockovich’s fight spurred a national conversation about water safety. In the decades since the Hinkley case, regulatory bodies have struggled to set a Maximum Contaminant Level (MCL) specifically for Hexavalent Chromium.

For a long time, the EPA only set a limit for "Total Chromium" (100 parts per billion), which does not distinguish between the safe and toxic forms. However, California led the way in 2024 and 2025 by finalizing a specific MCL for Chromium-6 at 10 parts per billion (ppb). By 2026, water systems across California are mandated to be in full compliance with these rigorous standards, or at least have a clear, enforceable path toward meeting them.

This regulatory shift is a direct descendant of the Hinkley litigation. It acknowledges that even trace amounts of Chromium-6 in drinking water pose a long-term risk to public health, justifying the cost of advanced filtration and remediation.

Frequently Asked Questions

What exactly did Erin Brockovich do to help the case?

Brockovich was the lead investigator for Masry & Vititoe. She personally visited the homes of Hinkley residents, gained their trust, and meticulously documented their medical histories. Her ability to connect the clusters of illnesses to the PG&E facility provided the human evidence needed to support the technical environmental data.

Did the settlement truly compensate the victims?

While $333 million was a record amount, many critics and plaintiffs argue that after legal fees and split among 634 people, the individual payouts—while significant—often failed to cover the lifetime costs of chronic healthcare and the loss of property value in a now-deserted town.

Is the water in Hinkley safe to drink now?

Remediation is ongoing. While the core of the plume is managed, many of the remaining residents rely on bottled water or sophisticated home filtration systems. The California State Water Resources Control Board continues to monitor the site closely to prevent further spread.

How did the movie change the public perception of the case?

The 2000 film starring Julia Roberts brought global attention to the issue of corporate environmental crime. It turned Erin Brockovich into a household name and inspired a new generation of environmental activists, though some legal experts note the film simplified certain complexities of the mass tort process.

Is Hexavalent Chromium found in other water systems?

Yes. Chromium-6 is a common industrial byproduct and can also occur naturally in some geological formations. It has been detected in the water supplies of many major U.S. cities, leading to ongoing calls for stricter federal EPA standards comparable to those in California.

What happened to the law firm Masry & Vititoe?

The firm gained immense prestige and resources from the Hinkley settlement. Ed Masry passed away in 2005. Erin Brockovich continues to operate her own consulting firm, investigating similar environmental clusters around the world, from PFOA contamination to lead in municipal water systems.

Practical Recommendations for Water Safety

If you are concerned about toxic contaminants in your local water supply, proactive steps are essential. The Hinkley scandal proved that residents cannot always rely on corporate or initial municipal assurances.

1. Request a Consumer Confidence Report (CCR): Every public water supplier in the U.S. is required to provide an annual report detailing the contaminants found in their water. Review this for "Total Chromium" levels.
2. Independent Testing: If you use a private well, or if you suspect local contamination, hire a certified laboratory to test specifically for Hexavalent Chromium. Standard home tests often do not distinguish between the types of chromium.
3. Filtration Solutions: If Chromium-6 is present, look for filtration systems certified by NSF International. Reverse osmosis systems are generally the most effective at removing dissolved heavy metals like Hexavalent Chromium.
4. Advocacy: Support local and national initiatives for stricter MCLs. The progress seen in 2026 regarding water safety is the result of decades of public pressure and legal precedent set by cases like the one in Hinkley.