In Monterey County, reported syphilis runs about 15% lower than the US average. To address a one-time concern or regular check-ups in Castroville, California, some clinics take walk-ins for same-day testing, while labs and at-home kits let you plan around your own time. See below for your local options.
Available testing centers
9 testing options are listed for Castroville, CA. The nearest, Clinica de Salud del Valle de Salinas, is about 0.4 miles away. Compare community and public clinics, private labs, and at-home kits below.
Listings tagged Community health center are federally funded health centers and rural clinics that treat everyone regardless of insurance or ability to pay: required to bill on a sliding fee scale and provide confidential care, and in many states minors may consent to their own STI testing. A Title X tag flags centers funded for confidential family-planning services; confirm current participation when you call.
Source: CMS FQHC & Rural Health Clinic enrollment files (data.cms.gov), refreshed quarterly. Title X status reflects the latest OPA grantee list.
Clinica de Salud del Valle de Salinas in Castroville is a community health center where STI care (gonorrhea, chlamydia, syphilis, HIV, and hepatitis testing, same-visit bacterial treatment, and sliding-scale fees) runs through the same appointment-based system as all primary care, with services conducted in Spanish.
Spanish functions as the operational language at Clinica de Salud del Valle de Salinas: not a supplemental accommodation but the medium through which history-taking, counseling, and treatment are delivered. For patients whose medical vocabulary exists in Spanish, that alignment shapes what can actually be communicated and understood during the visit.
Beyond gonorrhea, chlamydia, syphilis, and HIV, Clinica de Salud del Valle de Salinas tests for hepatitis C and tuberculosis in the same appointment. Meaning conditions that share transmission risk factors or patient populations are screened together, reducing the need for separate visits to address them.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Mar 2026 · Source: CDC NPIN
A public safety-net federally qualified health center about 6 miles from Castroville. Sliding-scale STD testing and care are typical here, call ahead to confirm the exact panel and pricing.
Tests offered
Fees & payment
Monterey Health Department in Marina operates on a sliding scale and accepts Medicare and most insurance, covering gonorrhea, chlamydia, syphilis, HIV, herpes, hepatitis B, hepatitis C, and TB. With same-visit treatment for bacterial infections and Spanish-language care on staff.
Skipping herpes or hepatitis C from your panel means a separate appointment, a separate bill, and a gap in your picture while you wait. Monterey Health Department tests for herpes, hepatitis B, and hepatitis C alongside the core STI panel, so nothing gets deferred to another visit or another provider.
Clinics focused solely on STI care send patients elsewhere when substance use is part of the picture: that's a second intake, a second waitlist, and care that rarely stays coordinated. Monterey Health Department carries substance-use treatment in the same setting, so both needs get addressed without splitting the care.
Without on-site Spanish capacity, a language gap at a critical moment (disclosing symptoms, understanding a result, deciding on treatment) can mean delayed care or a missed diagnosis. Monterey Health Department provides Spanish directly through its staff, so nothing gets lost between the question and the answer.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Aug 2025 · Source: CDC NPIN + HRSA
County of Monterey Integrated Health Clinic in Marina meets patients where they are (uninsured, between providers, or paying cash) through federally qualified standing that ties fees to income. Walk-ins can access sliding-scale STI screening for syphilis, gonorrhea, and chlamydia without an appointment.
Tests offered
Fees & payment
CSVS - Alvin Clinic in Salinas carries federally qualified health center standing, which translates directly into sliding-scale fees tied to household income for STI screening (syphilis, gonorrhea, and chlamydia) with no appointment needed to be seen.
Tests offered
Fees & payment
Free tool · not a clinic
Testing too soon can miss an infection. Enter the date of possible exposure to see the earliest a test can reliably detect each STI.
| Infection | Earliest reliable test | Conclusive after |
|---|---|---|
| Chlamydia | 7 days after exposure | 14 days after exposure |
| Gonorrhea | 7 days after exposure | 14 days after exposure |
| Trichomoniasis | 7 days after exposure | 28 days after exposure |
| HIV (NAT / RNA) | 10 days after exposure | 33 days after exposure |
| HIV (4th-gen Ag/Ab) | 18 days after exposure | 45 days after exposure |
| HIV (antibody) | 21 days after exposure | 84 days after exposure |
| Syphilis | 21 days after exposure | 42 days after exposure |
| Hepatitis B | 21 days after exposure | 42 days after exposure |
| Hepatitis C | 56 days after exposure | 77 days after exposure |
| Herpes (HSV) | 28 days after exposure | 112 days after exposure |
Guidance only, confirm timing with a clinician. A negative result before the conclusive date may need a repeat test.
Typical out-of-pocket ranges by option, actual cost depends on which tests you need.
Public / community clinic
Free HIV testing is common
Private lab (self-pay)
Never billed to insurance
At-home kit
Mailed to your door, private
Doctor / urgent care
Often $0 preventive with insurance
No centers match those filters. Clear the service-type filter or the opening-hours filters to see every center.
Every other option
Beyond the dedicated testing centers above: at-home kits by mail, hospital labs certified for STI testing, local clinicians who can order a panel during a regular visit, pharmacies for self-test kits and prescriptions, and online PrEP & treatment.
Test from home
The nearest testing center is less than a mile away; if you'd rather skip the trip, an at-home kit ships to Castroville, you collect the sample privately, and mail it back to a CLIA-certified lab. Results come online in days, with a clinician available if anything is positive. Same labs as a clinic, no waiting room, and you can read how accurate at-home STD tests are before you order.
Want a free option first? The CDC-supported TakeMeHome (opens in a new tab) program mails free at-home HIV self-test kits, and, in many areas, free STI kits, to your door, with no insurance or payment needed. The paid kits below add broader panels and faster turnaround.
In-home collection
$79 & up
Best value: single tests
$49 & up
Best range: couples & full panels
$79 & up
Every kit uses CLIA-certified labs. At-home testing is for screening; a reactive result should be confirmed and treated by a clinician. Prices and panels shown are illustrative and change often, confirm current details on the provider's site.
Also in the area
Beyond the public testing sites above, these federally certified (CLIA) labs serve Monterey County, each lab's town is shown on its card below. Many test through a doctor's order or by appointment rather than walk-in, so call ahead to confirm STD/STI testing and availability before visiting.
5 Harris Court Building T, Suite 201, Monterey, CA 93940
CMS-certified lab Accredited · COLA
23 Upper Ragsdale Drive, Suite 200, Monterey, CA 93940
CMS-certified lab
300 Canal Street, King City, CA 93930
CMS-certified lab Accredited · Joint Commission
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Castroville. A CLIA certificate records only that a laboratory is federally certified — it does not confirm the site performs STD testing, nor its hours, price or access. Inclusion is not an endorsement; always call to verify.
Local clinicians
Beyond dedicated clinics, 536 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Castroville. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 239 offer telehealth.
Daniel Magana Villalobos, MD
Internal medicine · 10561 Merritt Street, Castroville
Sumana Reddy, MD Telehealth
Family medicine · 8036 San Miguel Canyon Road, Salinas
Jennifer Archer, DO Telehealth
Family medicine · 17615 Moro Road, Salinas
Jalia Tucker, MD
Family medicine · 3155 De Forest Road, Marina
Deborah Brown, MD
Family medicine · 296 Reservation Road, Marina
Jon Yoshiyama, MD
Family medicine · 2180 North Main Street, Salinas
These are registry-listed clinicians, not dedicated STD-testing clinics. CMS records do not independently verify current licensure, testing services, availability, price, or new-patient status. Confirm each detail before booking. Source: CMS Doctors & Clinicians.
Nearby pharmacies
No pharmacy near Castroville, CA publishes an STD-related service or holds a current CLIA testing certificate, so these are simply the closest. Contact a location directly to confirm counter hours, services, prices, and availability before visiting.
Castroville Pharmacy
0.3 mi
5.3 mi 
5.5 mi 
5.9 mi Showing the 4 closest pharmacies to Castroville, CA.
Directory records identify nearby pharmacies. Service, stock, price, and hours information is shown only when supported by current location-specific evidence.
Prevention & treatment
Testing is one step. For residents of Castroville, telehealth covers the rest: HIV-prevention medication (PrEP) and DoxyPEP to lower future risk, and discreet online treatment if a result comes back positive. All prescribed by licensed U.S. clinicians.
Visit from $39
Online STI treatment & DoxyPEP: same-day prescriptions to your pharmacy
$0 with most insurance
Free online PrEP & DoxyPEP: HIV prevention, home lab kits, no in-person visit
Visit from $0 insured
Telehealth STI treatment and sexual-health care, delivered or to your pharmacy
From $0 insured
Telehealth PrEP & DoxyPEP with at-home testing and ongoing monitoring
Pricing varies by insurance and changes often, confirm on the provider's site. These services are not a substitute for emergency care.
STD stats & rates
How reported STI rates in Monterey County, the county that includes Castroville, compare with California and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~25% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#12 of 58 California counties for chlamydia, a higher rate than 79% of the state
| Infection | Monterey County | California | United States |
|---|---|---|---|
| Chlamydia | 498 2,145 cases ▲ 1% | 491.1 | 492.2 |
| Gonorrhea | 70.3 303 cases ▼ 63% | 190.2 | 179.5 |
| Syphilis (P&S) | 13.5 58 cases ▼ 17% | 16.3 | 15.8 |
| Syphilis (early) | 12.3 53 cases ▼ 36% | 19.1 | 16 |
| Syphilis (late/unknown) | 32.5 140 cases ▼ 30% | 46.7 | 29.5 |
Rates per 100,000 population, 2023. Source: CDC NCHHSTP AtlasPlus (county, state & U.S., all-ages basis). Population figures: U.S. Census Bureau ACS. These figures are the latest available surveillance estimates. Bars are scaled to the highest rate shown.
Reading these numbers: reported case rates only count infections that were actually tested for and diagnosed, so they track local screening effort as much as true spread: a higher rate can reflect more testing, a lower one less. Either way, most STIs cause no symptoms, so treat the figures above as context rather than a verdict, and test on the CDC's schedule regardless of how your area looks.
Between 2020 and 2023 in Monterey County, chlamydia has risen from 439.1 to 498 per 100,000 (13%), gonorrhea has fallen from 101.6 to 70.3 per 100,000 (31%), and P&S syphilis has risen from 6.4 to 13.5 per 100,000 (111%).
The 2020 dip reflects reduced pandemic-era screening, not lower transmission. Source: CDC NCHHSTP AtlasPlus (county, state & U.S., all-ages basis).
Community health context
Sources: CDC PLACES (ZIP), County Health Rankings, CDC/ATSDR SVI, HRSA HPSA, HRSA MUA/P, Neighborhood Atlas ADI. Lower insurance coverage, fewer routine checkups, and a thin primary-care ratio all raise the value of low-cost public clinics and at-home testing in Monterey County.
Local HIV snapshot
Monterey County HIV care continuum (2023)
Monterey County recorded 8.5 new HIV diagnoses per 100,000 (2023), against 14.9 statewide and 13.7 nationally. Among Monterey County residents living with HIV, 74.1% are in care · 68.3% are virally suppressed. Early, routine testing is what moves these numbers: it is the entry point to PrEP, treatment, and viral suppression.
Sources: AIDSVu (Emory/Gilead) · CDC AHEAD · CDC AtlasPlus · CDC NCHHSTP AtlasPlus (county care continuum). The CDC recommends everyone aged 13–64 test for HIV at least once: every lab and clinic listed above offers HIV testing, and free rapid HIV testing is available at a local health department.
Congenital syphilis, passed from parent to baby in pregnancy, is the fastest-rising STI in the country. U.S. cases climbed from 2,163 in 2020 to 3,882 in 2023. It is almost entirely preventable: the CDC recommends a syphilis test at the first prenatal visit, and every clinic and lab listed for Monterey County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Blackie Meadows Estates sits close enough to the fields along Merritt Street that the rhythm here is agricultural, early starts, long shifts, households that run deep. With an average of nearly five people sharing a home and rents that still claim a meaningful share of a paycheck, Castroville's households tend to pool resources carefully. Only a small fraction of families clear six figures, and unemployment runs notably high for a labor-force that's already heavily committed to seasonal and agricultural work. That combination (stretched budgets, irregular schedules, large shared households) shapes which healthcare appointments actually get made. For younger adults in their late teens and twenties, those pressures are sharpest.
A shift that runs past clinic hours, a shared car, or the cost of a copay can each quietly derail a planned screening. Cost and calendar are more likely to be. Monterey County's STI picture gives those realities some weight. Renters who cycle through housing near CA 1 or closer to Manzanita County Park don't always have a consistent provider, making the clinic cards on this page a practical starting point rather than a last resort.
Getting there
Castroville scores 11.12/20 on the EPA walkability index, so many trips are walkable or a short ride, though a car still gives you the widest choice of testing centers.
Source: EPA National Walkability Index 2021.
ZIP 95012 snapshot
ZIP-level Census figures for the wider 95012 area around Castroville: a single ZIP can span several communities, so they describe the area, not Castroville alone.
Castroville sits in Monterey County, ZIP 95012. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Castroville? These nearby communities have their own testing guides: clinics, at-home kits, and free screening close to home.
Reference
Everything to know before you test in Monterey County: the CDC's screening guidelines, each infection's detection window, per-test reference prices, and your privacy rights under California law. If you have symptoms right now, our confidential symptom checker maps them to the tests worth considering.
Based on current CDC screening recommendations.
| Group | Tests | How often |
|---|---|---|
| Everyone aged 13–64 | HIV | At least once |
| Sexually active women under 25 | Chlamydia, gonorrhea | Every year |
| Women 25+ with new or multiple partners | Chlamydia, gonorrhea | Every year |
| Pregnant people | HIV, syphilis, hepatitis B & C, chlamydia | Early in pregnancy |
| Gay & bisexual men (MSM) | Chlamydia, gonorrhea, syphilis, HIV | Every 3–6 months |
| Anyone who shares injection equipment | HIV, hepatitis B & C | At least yearly |
| All adults at least once | Hepatitis C | At least once |
Testing too early can return a false negative, confirm timing with a Castroville-area provider.
| Infection | Earliest reliable test | Sample |
|---|---|---|
| Chlamydia | 1–2 weeks | Urine or swab |
| Gonorrhea | 1–2 weeks | Urine or swab |
| Trichomoniasis | 1–4 weeks | Urine or swab |
| HIV (NAT / RNA) | 10–33 days | Blood |
| HIV (4th-gen Ag/Ab) | 18–45 days | Blood |
| HIV (antibody) | 3–12 weeks | Blood / oral |
| Syphilis | 3–6 weeks | Blood |
| Hepatitis B | 3–6 weeks | Blood |
| Hepatitis C | 8–11 weeks | Blood |
| Herpes (HSV) | 4–16 weeks (antibody); swab a sore | Blood / swab |
These are the federal Medicare reference prices for processing each lab test. Public clinics and the community health centers serving Castroville often test free or on a sliding scale; private labs and at-home kits bundle several tests into one fee. Use this as a per-test benchmark before you pay out of pocket, or see the full guide to STD test costs for insurance, free, and at-home options.
| Test | Reference price | CPT / HCPCS |
|---|---|---|
| Chlamydia (NAAT) | $47.80 | 87491 |
| Gonorrhea (NAAT) | $47.80 | 87591 |
| Trichomoniasis (NAAT) | $47.76 | 87661 |
| HIV-1/2 antigen/antibody | $26.87 | 87389 |
| HIV-1/2 antibody | $22.44 | 86703 |
| Syphilis (RPR/VDRL) | $5.61 | 86592 |
| Syphilis (treponemal antibody) | $17.49 | 86780 |
| Herpes (HSV NAAT) | $47.76 | 87529 |
| Hepatitis B surface antigen | $15.33 | 87340 |
| Hepatitis C antibody | $29.16 | 86803 |
Source: Medicare Clinical Laboratory Fee Schedule, CMS, 2025 rates (data.cms.gov). Reference rate for the lab assay only: a clinic visit, sample collection, or a bundled multi-test panel may cost more. Medicaid and most insurers cover STD screening at no out-of-pocket cost.
Two things that actually depend on California law: who can consent, and whether partners can be treated without their own visit. Everything else about testing privately is the same nationwide (see below).
In California, a minor aged 12 or older can consent to confidential STI testing and treatment on their own, no parental permission is required.
California permits Expedited Partner Therapy (EPT): if you test positive for chlamydia or gonorrhea, your provider can give you medication (or a prescription) to pass to your partner, no separate exam or appointment needed for them.
Keeping a test private works the same in every state. Whether an STD test shows on insurance (the EOB), how to test anonymously, and self-pay options that leave no insurance trail don’t change by location.
Learn more about confidential STD testing in CaliforniaSource: Guttmacher Institute, Minors' Access to STI Services; CDC, Legal Status of Expedited Partner Therapy. General information, not legal advice.
Good to Know
Answers to the questions people ask most before getting tested.
Yes, several local labs offer same-day walk-in testing; best to call first.
Private labs run about $24 for one test and $139 for a full panel; at-home kits are $49+.
Public clinics serve people without insurance, often on a sliding scale.
A full panel typically covers chlamydia, gonorrhea, syphilis, HIV, and hepatitis B and C.
Monterey County reported ~498 chlamydia cases per 100,000 in 2023, above the California average.
Most results are ready in about 1–2 days.
In California, people under 18 can consent to confidential STD testing and treatment on their own.
Yes, most STIs cause no symptoms for a long time, which is exactly why routine screening matters.
A blood draw screens for syphilis, with a confirmatory test if it's reactive.
Many STIs are fully cured with antibiotics; others, like HIV and herpes, are well managed with treatment.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.