PFAS Pollution in Drinking Water in the City of Stockton
We’ve recently learned about the PFAS water contamination issue affecting Stockton residents, and we’re here to help. As experienced attorneys at Marin & Murphy Law Firm, we understand the gravity of this situation and the potential health risks associated with PFAS exposure. If this environmental crisis has impacted you or your loved ones, knowing your rights and exploring your legal options is essential. Let’s take a closer look at the details surrounding the Stockton PFAS water contamination and how our firm can support you through this challenging time.
Water Provider PFAS Detection Details
According to the detection details, the City of Stockton, a California water provider, they discovered PFOS contamination in their water system at a level of 4.8 parts per trillion (ppt) on February 28, 2023, by sampling from a well.
This PFOS level exceeds the safe threshold, indicating potential health risks for residents. As a water provider, the City of Stockton is responsible for ensuring the safety and quality of the water supplied to its community.
The detection of PFOS water contamination in California, specifically in the City of Stockton, raises concerns about the extent of the issue and its impact on public health. The water provider must immediately address this problem and inform the public.
We urge the water provider to be transparent about their findings and take immediate action to address this serious issue. There is overwhelming evidence showing how PFAS is cancer-causing, such as kidney cancer, testicular cancer, and ulcerative colitis.
City of Stockton PFAS Contamination: Vital Information for Residents
Stockton, California, located in San Joaquin County, serves a population of approximately 320,000 residents who rely on the City of Stockton’s municipal water system for their drinking water. On February 28, 2023, a water sample collected from a well revealed perfluorooctane sulfonate (PFOS) contamination at a level of 4.8 parts per trillion (ppt). PFOS, a type of per- and polyfluoroalkyl substance (PFAS), is a persistent, man-made chemical linked to serious health risks, including kidney cancer, testicular cancer, and ulcerative colitis. This detection confirms the presence of PFAS in Stockton’s water supply, raising critical concerns for the community.
Details of PFAS Contamination
The City of Stockton’s finding of 4.8 ppt of PFOS exceeds the U.S. Environmental Protection Agency’s (EPA) regulatory limit of 4 ppt for PFOS, established as an enforceable standard to protect public health. In California, the State Water Resources Control Board has set a Notification Level (NL) of 6.5 ppt for PFOS and a Response Level (RL) of 40 ppt, rather than a Maximum Contaminant Level (MCL) as of April 2025. The detected level of 4.8 ppt falls below the state’s NL and RL but surpasses the EPA’s stricter federal limit. This discrepancy highlights the urgency of addressing PFOS contamination, as federal standards indicate a health risk at this concentration. Potential sources of PFAS in Stockton may include industrial discharges, historical use of firefighting foam, or agricultural runoff—each demanding investigation and accountability.
Residents of Stockton and nearby areas, such as Lodi, Manteca, and Tracy, must remain vigilant about PFAS risks in both public and private water sources. Private wells in San Joaquin County could also be impacted, given the region’s industrial and agricultural activity. The City of Stockton bears a legal duty to disclose its testing results fully and act swiftly to mitigate this contamination.
Health Risks and Protective Measures
PFOS and other PFAS compounds are classified by the EPA as probable human carcinogens. Extensive scientific evidence associates prolonged exposure with:
- Kidney cancer
- Testicular cancer
- Ulcerative colitis
- Thyroid disease
- Immune system impairment
Residents should insist on regular updates from the City of Stockton and review water quality reports, available through official municipal channels. Those with private wells are encouraged to arrange independent PFAS testing through the California State Water Resources Control Board or local health authorities to evaluate risks beyond the public system.
What Is PFAS?
To understand the significance of this water contamination, let’s explore what PFAS are and why they threaten public health.
PFAS, or per- and poly-fluoroalkyl substances, are a group of man-made chemicals that include PFOS. Due to their water—and oil-repellent properties, PFAS are used in various industrial and consumer products. However, they don’t break down easily and can accumulate in the environment and our bodies over time.
Exposure to PFAS has been linked to several health issues, including cancer, immune system suppression, and developmental problems. The detection of PFOS in Stockton’s water supply, as evidenced by the well sampling and PPT data, highlights the need for immediate action to protect the public health of California residents.
PFAS’s Connection to Cancer
We’ve seen how PFAS contamination can be a severe issue, but did you know it’s also been linked to certain types of cancer?
Studies suggest that exposure to PFAS may increase the risk of testicular cancer and ulcerative colitis.
Let’s look at what the research shows about these potential connections.
PFAS and Testicular Cancer
Studies show that exposure to PFAS chemicals, like those detected in Stockton’s water supply, may increase the risk of testicular cancer.
Our team of personal injury lawyers is deeply concerned about the potential impact of PFAS contamination on public health in California.
The well sampling conducted in Stockton revealed PFOS levels of 4.8 ppt, which is alarming given the growing body of research linking PFAS exposure to testicular cancer.
Residents have the right to know about the risks associated with water contamination and the steps they can take to protect themselves and their families.
As we continue to investigate this issue, we’re committed to holding those responsible for PFAS contamination accountable and fighting for the health and well-being of affected communities.
PFAS and Ulcerative Colitis
Frequently Asked Questions
What Are the Health Risks Associated With PFOS Exposure?
We’ve found that PFOS exposure may lead to developmental issues, liver and kidney problems, and increased cancer risk. It’s crucial to stay informed about potential contamination in your area and take steps to protect your health.
How Long Has PFOS Contamination Been Present in Stockton’s Water Supply?
We are still determining how long PFOS has been in Stockton’s water. The contamination was recently detected at 4.8 ppt on 2/28/2023, but it may have been present before then. We’re working to find out more.
Are There Any Water Filtration Systems That Can Effectively Remove Pfos?
Yes, there are filtration systems that can effectively remove PFOS. Reverse osmosis and activated carbon filters are two options. We recommend consulting with a water treatment professional to find the best solution for your needs.
About the Author: PFAS Lawyer Matthew Marin
Attorney Matthew Marin is a seasoned legal professional with a deep commitment to environmental justice and client advocacy, particularly in cases involving water contamination. A graduate of Roger Williams University School of Law, Matthew has been practicing law since 2008, focusing on environmental law and personal injury cases. With over 15 years of experience, he has honed his skills in litigating complex cases related to water quality and safety, earning a reputation for meticulous case preparation and tenacious representation. Matthew has successfully handled numerous cases involving PFAS in water supplies, securing favorable outcomes for his clients and contributing to the remediation of drinking water. His approach is characterized by thorough research, strategic planning, and a relentless pursuit of justice. Known for his compassionate approach, Matthew takes the time to understand each client’s unique situation, ensuring they feel heard and supported throughout the legal process. His extensive knowledge and experience inform his work on the legal aspects of water contamination and environmental protection.
Marin & Murphy Law Firm is not currently accepting new PFAS claims. This page is general information about water quality and public health, not legal advice, and reading it or contacting the firm does not create an attorney-client relationship. The firm is licensed in South Carolina, Rhode Island, Massachusetts and Connecticut; its PFAS matters are handled with co-counsel who maintain local counsel arrangements nationwide. Matthew T. Marin, SC Bar #102771, 997 Morrison Drive, Suite 200, Charleston, SC 29403.