STD Testing in Castaic, CA
14 places to get tested — 4 partner labs that need no appointment, and 10 clinics and testing sites near Castaic.
- 4partner labs
- 2free clinics
- 6sliding scale
- 2insurance or fee
Order a test online
Pick a panel, visit a lab nearby, results in 1–2 days. No appointment, no insurance.
GET TESTED NOWCompare pricing →4,500+ labs nationwide · from $24Partner labs near Castaic
Order online, then walk in the same day with no appointment. A urine or blood sample takes about 15 minutes, and results come back in 1–2 days. They are confidential: never reported to your insurance company or added to your medical record.
Labcorp
4.5 mi awayNo appointment$10 off orders over $100 applied at checkoutOrder a test for this lab →Quest Diagnostics
5.8 mi awayNo appointmentOpen Saturday$10 off orders over $100 applied at checkoutOrder a test for this lab →Labcorp
6.3 mi awayNo appointment$10 off orders over $100 applied at checkoutOrder a test for this lab →Quest Diagnostics
6.9 mi awayNo appointment$10 off orders over $100 applied at checkoutOrder a test for this lab →
We earn a commission if you order through the links above. It does not change what you pay, and it does not decide which labs are listed — those are the closest partner labs to Castaic.
Explore testing locations near Castaic
Clinics and testing sites near Castaic
No free or low-cost clinic is addressed in Castaic itself, so the nearest are listed below, closest first. Public clinics generally take longer to return results than a private lab, and several test on set days only, so it is worth calling ahead. If you would rather not wait or give your details at a public clinic, the 4 partner labs in Castaic need no appointment and return results in 1–2 days.
How we chose these 10 clinics
- Every one is on the CDC’s GetTested locatorThe wider CDC directory we draw from has over 16,000 entries. Only the ones GetTested also lists can appear here, and all 10 clinics below do.
- Listings that name fewer than three tests are left outEven on GetTested, 527 listings name fewer than three tests. We don’t show them anywhere.
- Unverified pregnancy centers are never shownThe CDC lists some pregnancy centers whose STD testing we couldn’t verify. We don’t list them anywhere.
- Cost is stated the way the CDC lists itFree, sliding scale or insurance accepted, as each clinic reports it to the CDC. We don’t estimate prices, and if the listing says nothing, the card says “Fees not listed.”
Directory retrieved September 4, 2026. Open “View services” on any card to see when that clinic last updated its listing. All sources
- Clinic16.4 mi away
Free Clinic of Simi Valley
2003 Royal Ave, Simi Valley, CA, 93065
HoursNot listedAppointmentsAppointment requiredFeesFree STI testing listed- STI testing
- Treats STIs
- Spanish spoken
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · Syphilis · TB
Treatments STI treatment · Family planning
Languages English · Spanish
CDC GetTested listing, last updated by the source December 4, 2025. Directory retrieved September 4, 2026.
- Community health center17.5 mi away
San Fernando Community Health Center
732 Mott St, San Fernando, CA, 91340
HoursMon-Fri 8:00am-5:00pm
AppointmentsAppointment requiredFeesFree HIV testing listed- HIV & STI testing
- PrEP & PEP
- Treats STIs
- Medicaid accepted
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · Syphilis · HIV · Herpes · Hepatitis B · Hepatitis C · Hepatitis A · TB · Self-test kit
Treatments STI treatment · PrEP · PEP · Family planning · HPV vaccine · Hep B vaccine · Free condoms · PrEP navigation · Case management
Languages English · Spanish · other languages · interpreter available
CDC GetTested listing, last updated by the source July 20, 2026. Directory retrieved September 4, 2026.
- Clinic19.0 mi away
Optum
West Valley Infectious Diseases
7230 Medical Center Dr, West Hills, CA, 91307
HoursNot listedAppointmentsAppointment requiredFeesInsurance accepted- HIV & STI testing
- PrEP
- Treats STIs
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · Syphilis · HIV · Hepatitis B · Hepatitis C · Hepatitis A · TB
Treatments STI treatment · PrEP · HIV care · Hep C treatment · Family planning · HPV vaccine · Hep B vaccine · PrEP navigation · Case management
Languages English
CDC GetTested listing, last updated by the source November 12, 2025. Directory retrieved September 4, 2026.
- Clinic19.1 mi away
Carbon Health
Moorpark Clinic
806 New Los Angeles Ave, Moorpark, CA, 93021
HoursMon-Fri 8:00am-6:00pm+1
Sat-Sun 8:00am-4:00pmAppointmentsWalk-ins acceptedFeesInsurance accepted- HIV & STI testing
- PrEP & PEP
- Treats STIs
CallWebsiteDirectionsView services
Tests Chlamydia · Gonorrhea · HIV · Herpes · Hepatitis B · Hepatitis C · Hepatitis A · TB
Treatments STI treatment · PrEP · PEP · HIV care
Languages English
CDC GetTested listing, last updated by the source October 17, 2025. Directory retrieved September 4, 2026.
Testing privacy
Anonymous vs. confidential testing
Most clinics test confidentially. Some also offer anonymous testing, usually for HIV. Availability varies by testing site, so ask when you call.
Confidential
- You give your name, and the result goes in your medical record.
- Results are not available to the public.
- Chlamydia, gonorrhea, syphilis and HIV are reportable in every state, so a positive result is reported to the health department. Those reports are kept confidential.
Anonymous
- You don’t give your name.
- You receive a number and use it, not your name, to get your result.
- Not every site offers it. Ask before your visit.
Source: NIH HIVinfo, HIV Testing · CDC, STI Reporting and Confidentiality
Buy an at-home STD test near Castaic and online
Walgreens and Walmart sell over-the-counter test kits near Castaic, and myLAB Box ships one to your door. You collect the sample at home and mail it to a lab. Stock varies by branch — call ahead or check online before making the trip.
Walgreens
Nearest branch · 1.3 mi1 storeWalmart
Nearest branch · 4.0 mi1 storemyLAB Box
Online · ships nationwideMail-in kit
We earn a commission if you order a myLAB Box kit through the link above. It does not change what you pay, and it does not decide which pharmacies are listed — those are the chains with branches near Castaic.
Los Angeles County STD rates
Reported cases per 100,000 residents. Change shown against the year before.
Chlamydia
▲ 2.3%602.3per 100k
58,200 reported cases · 2023 · 23% above the CA rate
Gonorrhea
▲ 0.2%291.8per 100k
28,195 reported cases · 2023 · 53% above the CA rate
Syphilis
▼ 12.6%21.6per 100k
2,085 reported cases · 2023 · 33% above the CA rate
HIV
▼ 0%1new diagnoses
2023 · rate not published
Source: CDC NCHHSTP AtlasPlus, 2023 release · Los Angeles County CA STD Statistics
There were 1 new HIV diagnoses in Los Angeles County in 2023. HIV is the one infection where how soon you test changes which test you need — an RNA test detects it far earlier than a standard antibody test.
Los Angeles County reported 58,200 chlamydia cases in 2023, a rate of 602.3 per 100,000 residents. That is above the national average, which is why routine testing matters here more than it does in most of the country — and most people who have chlamydia or gonorrhea have no symptoms at all, so waiting for something to feel wrong is not a strategy.
HIV prevention & treatment
PrEP, DoxyPEP & Online Treatment
A test result is the start, not the end. If you are negative and want to stay that way, PrEP and DoxyPEP cut the risk of a future infection. If you are positive, most STIs can be treated without setting foot in a clinic. Both are available to people in Castaic by video visit, prescribed by clinicians licensed in California.
- Treatment & DoxyPEP
Wisp
STI treatment $39 · DoxyPEP from $22
Treatment for an STI, and DoxyPEP, prescribed online. The prescription goes to your pharmacy the same day.
Visit Wisp - HIV PrEP & DoxyPEP
Q Care Plus
$0 for most insured patients
PrEP and DoxyPEP by video visit, with test kits posted to you and follow-up bloodwork tracked between refills.
Visit Q Care Plus - HIV PrEP & DoxyPEP
MISTR
$0 with or without insurance
HIV prevention handled entirely from home: PrEP and the lab work that goes with it, no appointment.
Visit MISTR
Prices depend on your insurance and change frequently — check the provider’s own site before ordering. None of these replace emergency care.
STD testing in Castaic, answered
Where can I find free or sliding-scale STD testing near Castaic?
Among the 10 clinics listed near Castaic, 2 list free testing for at least one infection and 6 list sliding-scale fees. Confirm eligibility and charges before visiting. Free testing is listed at Free Clinic of Simi Valley, San Fernando Community Health Center.
How much does STD testing cost near Castaic?
Among the 10 clinics listed near Castaic, 2 list free testing for at least one infection and 6 charge on a sliding scale based on income. Private lab testing is a flat price paid up front — no insurance is filed, so nothing appears on an explanation of benefits.
Can I get tested on a weekend near Castaic?
2 of the 10 listed clinics publish Saturday hours: Carbon Health, Planned Parenthood Los Angeles. Some partner labs also open on Saturday — the cards above show which.
How common are STDs in Castaic?
In 2023, Los Angeles County reported 58,200 chlamydia cases — a rate of 602.3 per 100,000 residents. Gonorrhea was 291.8 per 100,000. There were also 1 new HIV diagnoses in 2023.
Is testing available in Spanish near Castaic?
7 of the 10 listed clinics indicate that Spanish-language services are available, and 7 list PrEP.
- Partner labs
- Quest and Labcorp location directories · checked August 2026
- Public clinics
- CDC GetTested / NPIN directory · retrieved September 4, 2026
- Retailers
- Retailer store directories · updated September 2026
- Statistics
- CDC NCHHSTP AtlasPlus · reporting year 2023
- HIV diagnoses
- CDC HIV Surveillance · reporting year 2023
