If you need a paternity test in California, at-home testing is completely legal here. Unlike New York, which restricts self-collected DNA samples, California places no restrictions on ordering a home DNA test kit, collecting your own samples, and mailing them to a lab.
But California does have its own parentage laws that affect how paternity is established, challenged, and enforced. Whether you need a name on a birth certificate, are dealing with a child support case, or just want a private answer, it helps to understand how California handles things differently.
California Paternity Law Basics
California's paternity laws live in the California Family Code, Division 12 (starting at Section 7600). The state uses the term "parentage" rather than just "paternity," which reflects the fact that these laws apply broadly — not only to fathers.
The biggest thing to understand is California's marital presumption. Under Family Code Section 7611, if a child is born to a married couple, the spouse is presumed to be the child's legal parent. That presumption is strong. Even if DNA testing later shows someone else is the biological father, it can be difficult to overcome — especially if the presumed father has been actively parenting the child.
For unmarried parents, there is no automatic presumption. Paternity has to be established through one of the methods below.
Voluntary Declaration of Parentage in California
Most states call this a "Voluntary Acknowledgment of Paternity" or VAP. California uses a different name — a Voluntary Declaration of Parentage (VDP). Same concept, different form. If you keep seeing references to a "VAP," know that California's version is the VDP.
The VDP is a legal form both parents sign declaring that a person is the child's parent. Hospitals offer it to unmarried parents at birth. You can also complete one later through the local child support agency or a family law facilitator. Once signed and filed with the California Department of Public Health, a VDP has the same legal force as a court order — the declared parent's name goes on the birth certificate and that person takes on full legal rights and responsibilities, including child support.
You do not need a DNA test to sign a VDP. But if there is any doubt about biological parentage, getting a DNA test before signing is smart. Once a VDP is filed, undoing it is not easy.
How to Rescind a VDP in California
California gives you a limited window to change your mind after signing a VDP.
Within 60 days: Either parent can rescind the VDP by filing a rescission form with the California Department of Child Support Services. No court hearing required.
60 days to 2 years: After the rescission window closes, you can only challenge a VDP through a court action filed within two years of the child's birth. You will need to show fraud, duress, or a material mistake of fact — such as DNA evidence proving the declared parent is not the biological parent.
After 2 years: The VDP is essentially permanent. California courts are very reluctant to disturb established parent-child relationships, even when DNA says the biology doesn't match.
This is why we recommend testing sooner rather than later if you have questions about parentage. Getting answers early — before legal documents are signed and deadlines pass — gives you more options.
Court-Ordered Paternity Testing in California
When parents can't agree on parentage, either party can file a parentage action through California's family court. Here is how it generally works:
- Filing. One parent (or the state) files a petition to establish parentage in the family court of the county where the child lives.
- Court orders DNA testing. If the alleged father disputes paternity, the court will typically order a court-ordered DNA test. Family Code Section 7551 allows the court to order any party to submit to genetic testing.
- Professional sample collection. Samples are collected by a trained professional at an approved facility with full chain-of-custody documentation.
- Results. If the report shows a 99% or higher probability of paternity, California law creates a presumption that the tested man is the father.
- Court ruling. The court enters a judgment establishing (or disestablishing) parentage.
The process from filing to ruling can take several months, depending on the court's schedule and whether the other party contests anything.
The Role of California's Department of Child Support Services
California's Department of Child Support Services (DCSS) and its local child support agencies (LCSAs) play a big role in paternity establishment. If a parent applies for child support and paternity hasn't been established, the LCSA can help complete a VDP, file a parentage action in court, request court-ordered DNA testing, and in many cases cover the cost of genetic testing.
You do not need a private attorney to go through DCSS — the agency handles filings and court appearances. DCSS also gets involved when a custodial parent applies for public assistance like CalWORKs or Medi-Cal, since the state may automatically open a child support case and pursue paternity to recover costs.
At-Home vs. Legal Testing in California
An at-home paternity test (also called a "peace of mind" test) is something you order yourself, collect at home, and send to the lab. It gives you accurate, private results — but because there is no chain of custody or identity verification, the results are not admissible in court. See our full breakdown of home vs. legal paternity tests.
A legal paternity test requires professional sample collection with identity verification, photographs, and chain-of-custody documentation. Those results can be used in court.
The lab science is identical either way. If you just want to know for yourself, an at-home test gives you the answer. You can order a home paternity test kit from US Diagnostics Center for $79 with prepaid return shipping included. We analyze up to 28 genetic markers (the industry standard is 20 or more), and results are ready in 2-3 business days after samples arrive at our lab.
If there is any chance you will need results for court, start with a legal test so you don't pay for testing twice.
How DNA Testing Works
The testing process is the same whether you are in California or any other state. You collect cheek swab samples (takes about 30 seconds per person), mail them to the lab in the prepaid packaging, and the lab compares specific genetic markers between the child and the alleged father. A positive result shows 99% or higher probability of paternity. A negative result shows 0% — a complete exclusion.
Our guide on how DNA testing works covers each step in detail.
California's Unique Rule: More Than Two Legal Parents
California is one of the few states that allows a child to have more than two legal parents.
In 2013, Senate Bill 274 amended Family Code Section 7612 so that a court can recognize three or more people as a child's legal parents if failing to do so would be "detrimental to the child." This comes up in situations involving stepparents, same-sex couples, surrogacy arrangements, and other modern family structures.
The court has to find that recognizing only two parents would cause real harm to the child — it is not applied casually. But it does mean that DNA results alone don't always tell the whole legal story in California. Biology establishes who the biological parent is. The courts decide what that means legally.
Frequently Asked Questions
Can I order an at-home paternity test if I live in California?
Yes. California does not restrict at-home DNA sample collection. You can order a kit, collect cheek swab samples at home, and mail them to the lab. This is different from New York, which effectively prohibits home collection for paternity testing.
Will an at-home paternity test hold up in California family court?
No. California courts require chain-of-custody documentation for DNA evidence to be admissible. An at-home test gives you an accurate answer, but a judge won't accept results without identity verification and professional collection. Our article on court-ordered paternity tests explains that process.
What happens if a mother is married but the biological father is someone other than her husband?
California's marital presumption means the husband is the legal father by default. Overcoming that requires a court action, and courts weigh the child's best interests heavily. If the husband has been actively parenting the child, a court may uphold the presumption regardless of DNA evidence.
How long do I have to challenge a Voluntary Declaration of Parentage?
You can rescind (cancel) a VDP within 60 days of signing by filing a rescission form. After that, you can challenge it in court within two years of the child's birth by showing fraud, duress, or a material mistake of fact. After two years, it is extremely difficult to set aside a VDP in California.
Does California child support services pay for DNA testing?
In many cases, yes. When the local child support agency (LCSA) files a parentage action and the court orders genetic testing, the agency may cover the testing costs. If you are going through DCSS to establish paternity, ask your caseworker about whether testing costs will be covered in your case.
Getting Started
If you are in California and want private answers about paternity, you can order a home paternity test kit from US Diagnostics Center for $79 with prepaid return shipping included. We analyze up to 28 genetic markers, and results come back in 2-3 business days. Express processing options are available during checkout if you need results sooner.
If you have questions about whether a home test or legal test is right for your situation, reach out to us. We are happy to help.
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