Top 10 Worst Prisons in California (2025)

California is home to some of the largest prison systems in the United States, but not all correctional facilities are equal in their conditions and management. Over the years, certain prisons have developed a reputation for being unsafe, overcrowded, and inhumane. These facilities are consistently listed among the worst prisons in California because of ongoing violence, health care failures, and poor rehabilitation opportunities. Understanding why these prisons carry such a negative reputation highlights the struggles faced by inmates and the challenges for reform.

Top 10 Worst Prisons in California

1. Pelican Bay State Prison – Crescent City, Del Norte County

Pelican Bay State Prison is often regarded as one of the worst prisons in California due to its notorious Security Housing Unit. Inmates here have faced years of solitary confinement in windowless cells with minimal human contact. Critics argue that this extreme isolation violates human rights. The prison has been the center of several hunger strikes where prisoners protested inhumane treatment. Violence among inmates and poor rehabilitation opportunities further contribute to its reputation as one of the worst prisons in California.

2. San Quentin State Prison – San Quentin, Marin County

San Quentin is California’s oldest prison and remains one of the worst prisons in California because of overcrowding and outdated facilities. The prison’s old infrastructure has made it unsafe and unsanitary for many inmates. It became infamous during the COVID-19 pandemic for one of the largest outbreaks in the nation, leading to numerous deaths. Health care failures and deteriorating living standards highlight the struggles inside San Quentin. Combined with its aging conditions, it ranks high among the worst prisons in California.

3. Folsom State Prison – Folsom, Sacramento County

Folsom State Prison is one of the most historic correctional facilities, but its reputation as one of the worst prisons in California comes from overcrowding, inmate violence, and poor conditions. The infrastructure is outdated, with failing plumbing and heating systems that make life difficult for prisoners. Reports of gang activity and frequent assaults add to its violent atmosphere. Rehabilitation is limited, and many inmates feel trapped in an environment where safety is constantly threatened, cementing its place as one of the worst prisons in California.

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4. California State Prison, Los Angeles County – Lancaster, Los Angeles County

California State Prison in Los Angeles County is regularly listed among the worst prisons in California because of its high rates of violence and medical care failures. Overcrowding makes conditions worse, straining both security and healthcare services. Guards and inmates alike face safety risks due to frequent altercations. Reports of attacks on staff members further prove the dangerous environment. The lack of adequate rehabilitation programs contributes to its long-standing negative reputation, making this prison one of the most dangerous and worst prisons in California.

5. California State Prison, Sacramento – Sacramento County

Known as New Folsom, California State Prison Sacramento is another facility ranked among the worst prisons in California. It has faced repeated lockdowns due to escalating violence, including inmate homicides and staff assaults. Prison officials have been forced to restrict visits, calls, and recreational activities to maintain control. The atmosphere is tense, and rehabilitation efforts are overshadowed by constant security concerns. With violence rates higher than many other facilities, it is clear why this prison is consistently placed on the list of worst prisons in California.

6. Kern Valley State Prison – Delano, Kern County

Kern Valley State Prison is widely known as one of the worst prisons in California due to its alarming levels of inmate violence and deaths. Overcrowding has worsened the conditions, and staff shortages make it difficult to maintain order. Riots and attacks among inmates have been frequent, creating a hostile and unsafe environment. This prison struggles to provide sufficient rehabilitation or medical support, and its reputation for repeated violent incidents keeps it firmly on the list of the worst prisons in California.

7. Calipatria State Prison – Calipatria, Imperial County

Calipatria State Prison has been criticized for inhumane living conditions and overcrowding, making it one of the worst prisons in California. Many cells house more inmates than they were designed for, leading to poor sanitation and limited resources. During the COVID-19 pandemic, the prison was flagged for inadequate health care, leaving many inmates vulnerable. The prison is also known for harsh discipline and frequent lockdowns. The combination of poor medical care and unsafe conditions keeps Calipatria among the worst prisons in California.

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8. Soledad State Prison – Soledad, Monterey County

Soledad State Prison is another facility that earns its place among the worst prisons in California. It has been criticized for mismanagement, poor health services, and overcrowded conditions. Inmates have protested harsh treatment and a lack of access to adequate medical attention. Violence among prisoners is also a common occurrence, adding to its already negative reputation. The lack of resources for rehabilitation programs makes it even harder for inmates to reform, reinforcing why it belongs on the list of worst prisons in California.

9. Pleasant Valley State Prison – Coalinga, Fresno County

Pleasant Valley State Prison is considered one of the worst prisons in California due to overcrowding and recurring issues with inmate violence. Many prisoners have complained about poor medical care, limited staff support, and inadequate living conditions. Mental health services are insufficient, leaving vulnerable inmates without proper attention. Despite its large population, rehabilitation programs are scarce, causing frustration among prisoners. With frequent violent incidents and substandard conditions, Pleasant Valley State Prison is a prime example of the worst prisons in California.

10. Men’s Central Jail – Los Angeles, Los Angeles County

Men’s Central Jail is one of the largest detention facilities in California but is often referred to as one of the worst prisons in California because of unsanitary and unsafe conditions. Overcrowding has caused extreme stress on the system, with cells filled beyond capacity. Mold, pests, and poor ventilation create hazardous living environments. Inmates often suffer from inadequate mental health services, and violence is common. Despite being a jail rather than a prison, its conditions rank it among the worst prisons in California.

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Reasons Why They Are The Worst Prisons in California

  • Overcrowding that pushes facilities far beyond their design capacity, leading to unsafe and unsanitary conditions.
  • High levels of violence between inmates, creating dangerous environments that endanger both prisoners and staff.
  • Poor medical care, with many prisons failing to provide adequate treatment for chronic or urgent health issues.
  • Inadequate mental health services, leaving vulnerable inmates without proper psychological support.
  • Aging infrastructure with failing plumbing, ventilation, and sanitation that makes daily life extremely difficult.
  • Excessive use of solitary confinement that has raised human rights concerns and sparked hunger strikes.
  • Limited access to rehabilitation programs, making it harder for inmates to prepare for life after release.
  • Poor staff-to-inmate ratios that increase tension and reduce overall security in already hostile environments.

Reasons Why You Should Not Visit These Worst Prisons in California

  • The environment inside these prisons is often violent and unpredictable, putting visitors at potential risk.
  • Overcrowding and limited visitor facilities make visitation uncomfortable and stressful.
  • Strict security measures can create long wait times and invasive procedures for families.
  • The negative atmosphere and frequent lockdowns may result in canceled visits without notice.
  • Poor health and sanitation conditions inside can make visits unsettling and emotionally draining.
  • The lack of rehabilitation programs means family members may feel hopeless about their loved one’s progress.
  • Visiting the worst prisons in California can be emotionally traumatic, as families witness the harsh realities of prison life.

Conclusion

The worst prisons in California highlight the serious flaws in the state’s correctional system. Overcrowding, violence, poor medical care, and limited rehabilitation opportunities all contribute to their terrible reputations. Families of inmates often suffer as much as the prisoners themselves, facing canceled visits, emotional stress, and unsafe conditions. These prisons serve as a reminder of the urgent need for reform and improved management. Recognizing why they are considered the worst prisons in California helps shed light on the importance of addressing these systemic issues.