Child Support in Napa County, California

Napa County is a Bay Area county, serving families in Napa, American Canyon, and St. Helena. Child support cases are handled by the Superior Court of California, County of Napa and the county's Local Child Support Agency.

The state uses a single uniform guideline (Family Code section 4055) to calculate support. It looks mainly at both parents' net disposable incomes and the timeshare, the percentage of time the child is with each parent. Napa County uses that same presumptively correct formula.

Support gets ordered in two common ways. Either parent can file a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) inside a divorce, parentage, or custody case, or the county's Local Child Support Agency, part of the California Department of Child Support Services, can open a case to establish and enforce support. The forms are statewide, so what varies locally is administrative.

Because the number turns on income and timeshare, estimating early helps. Our free California child support calculator gives you a starting figure, and parents who agree can submit a written stipulation for a judge to sign.

How child support is calculated in California

California sets child support with a statewide uniform guideline (Family Code section 4055) that applies the same way in Napa County as everywhere else. The formula is based mainly on two things:

1. Both parents' net disposable incomes.
2. The percentage of time the child spends with each parent (the timeshare).

The guideline amount is presumed to be correct, and courts use a calculator to run the numbers. Because the result depends on accurate income, the Income and Expense Declaration (Form FL-150) you file is what drives your number.

Where child support cases are handled in Napa County

Child support in Napa County is handled through the Superior Court of California, County of Napa, and the county's Local Child Support Agency, which is part of the California Department of Child Support Services. There are two common paths:

1. Either parent files a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) inside a divorce, parentage, or custody case.
2. The Local Child Support Agency opens a case to establish, collect, and enforce support, often at no cost to the parents.

Because courthouse and local agency office details change over time, confirm current details using the official California Courts court finder:

Find the Napa County Superior Court (official California Courts finder)

Local notes for Napa County

Napa County handles these matters through its Superior Court in Napa, and its Local Child Support Agency runs an office for support cases. Confirm the correct courthouse using the official California Courts court finder, and find the county agency through the California Department of Child Support Services, before you file in person or by mail.

Napa County offers self-help resources that assist self-represented parents with Form FL-150 and court procedure, though staff cannot give legal advice about your circumstances. Since the guideline amount depends on the income figures you provide, completing the Income and Expense Declaration accurately and completely matters most.

Under California law, support usually lasts until the child turns 18, or 19 if the child remains a full-time high school student living at home and is not self-supporting. When circumstances change, such as a shift in income or timeshare, either parent can request a modification.

Official child support resources in Napa County

The Superior Court of California, County of Napa runs its family law self-help services, combined with the Family Law Facilitator's Office, out of the Historic Courthouse in the city of Napa. Staff there can calculate guideline child support and temporary spousal support using the state's guideline calculator, but cannot give legal advice or represent either party.

The Napa County Department of Child Support Services, the county's local child support agency, is based in the city of Napa.

The court's self-help page lists eFile and Guide & File options among its online services.

• Napa County Superior Court: Self-Help
• Napa County Department of Child Support Services

Local details reviewed July 2026. Offices and locations can change, so confirm with the official sites above before you file.

Napa County Child Support FAQs