Child Support in Fairfield and Solano County, California

Solano County sits in the Bay Area's northern reach. Its family courts and Local Child Support Agency handle support matters for families in Vallejo, Fairfield, and Vacaville, all through the Superior Court of California, County of Solano.

Child support in California follows one statewide guideline formula (Family Code section 4055), based mainly on both parents' net disposable incomes and the share of time the child spends with each parent, the timeshare. The guideline amount is presumed correct, and it works no differently in Solano County than anywhere else in California.

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 Solano 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 Solano County

Child support in Solano County is handled through the Superior Court of California, County of Solano, 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 Solano County Superior Court (official California Courts finder)

Local notes for Solano County

Because Solano County covers a larger population, confirm which courthouse and agency office serve your area before you file. 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.

The county's self-help center helps parents who represent themselves complete Form FL-150 and understand court procedure, but staff cannot give legal advice about your specific case. Because the guideline result is driven by the income you report, filling out the Income and Expense Declaration accurately is the most important step.

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 Solano County

The Superior Court of California, County of Solano handles family law matters at the Hall of Justice in Fairfield, the county seat.

The county's local child support agency, currently presented on the county's site as Child Support Services (also referred to as the Solano County Department of Child Support Services), is based in Fairfield.

The court's Family Law Facilitator's Office, also known as the Solano Legal Access Center, operates out of the Hall of Justice and assists self-represented parents with family law paperwork. The court's own e-filing page states that e-filing has been mandatory for attorneys in civil, family, and probate cases since January 2, 2025, under Local Rule 20, while self-represented parties remain exempt.

• Solano County Child Support Services
• Superior Court of Solano County: family law division
• Superior Court of Solano County: Family Law Facilitator's Office

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

Solano County Child Support FAQs