Contra Costa County reports about 13 new HIV diagnoses per 100,000 residents, near the US average. If you've had a recent risk, or simply maintain a regular testing schedule in Castle Hill, California, some clinics offer same-day testing for walk-ins, while labs and at-home kits provide more flexible scheduling options. See the list below for more information.
Available testing centers
7 testing options are listed for Castle Hill, CA. The nearest, Labcorp, is about 0.9 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.
Planned Parenthood Northern California in Walnut Creek accepts Medicaid, most insurance, and applies a sliding scale to every fee level: opening the full panel of HIV, syphilis, gonorrhea, chlamydia, herpes, and hepatitis B and C to anyone regardless of what they can pay. Appointments required; bacterial STIs treated same visit.
When a patient can't fully express symptoms or understand a diagnosis, STIs go undertreated and follow-up falls apart. Planned Parenthood Northern California Walnut Creek delivers care in Spanish and through interpretation services for other languages, so nothing critical gets lost between the exam room and the treatment plan.
Without Title X protections, a minor seeking STI testing or family planning faces disclosure risks that can stop care before it starts. As a Title X clinic, Planned Parenthood Northern California in Walnut Creek is legally bound to keep those services confidential: the care happens, and the record stays private.
Planned Parenthood Northern California Walnut Creek prescribes and manages both PrEP, including coverage for uninsured patients, and PEP directly, meaning the medications, monitoring labs, and follow-up cycles are handled within the same clinic rather than handed off. Uninsured patients have a specific cost pathway for PrEP built into the fee structure.
Languages
English, Interpretation Services Available for Non-English Languages, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Jul 2025 · Source: CDC NPIN
La Clinica in Concord tests for HIV, syphilis, gonorrhea, chlamydia, herpes, hepatitis B, and hepatitis C: the full panel runs on a sliding scale, with every service ultimately provided at no fee; bacterial infections are treated same-visit, and appointments are required.
Beyond gonorrhea, chlamydia, syphilis, and HIV, La Clinica's panel includes herpes simplex, hepatitis B, and hepatitis C. All ordered and resulted within the same clinical encounter. That reach means hepatitis C infection, which can progress silently for years, gets caught and managed here rather than surfaced only if a provider elsewhere thinks to look.
Spanish-language care at La Clinica runs through clinicians and staff who work in the language directly: histories are taken, results explained, and treatment plans laid out in Spanish without relay through a secondary service. That operational staffing keeps clinical nuance intact at every step of the encounter.
La Clinica accepts Medicaid, Medicare, and private insurance, and runs a sliding-scale fee for everyone else: the structure is built so that the final amount owed, regardless of payer or income, comes to nothing. No service on the panel carries a residual charge once that calculation runs.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Aug 2025 · Source: CDC NPIN + HRSA
Willow Pass Wellness Center in Concord ties STI screening fees to income, so cost never blocks care. Federal qualification backs that sliding-scale commitment. Walk-ins are welcome for syphilis, gonorrhea, and chlamydia screening, with no one turned away based on ability to pay.
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 Castle Hill, 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 range: couples & full panels
$79 & up
Best for simplicity & support
$89 & 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 Contra Costa 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.
3168 Danville Blvd Suite B, Alamo, CA 94507
CMS-certified lab
3201 Danville Boulevard, Suite 110, Alamo, CA 94507
CMS-certified lab
1200 Central Blvd Suite D, Brentwood, CA 94513
CMS-certified lab
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Castle Hill. 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, 4,740 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Castle Hill. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 2,031 offer telehealth.
Ann Nguyen-Traxler, MD Telehealth
Internal medicine · 1210 Rossmoor Parkway, Walnut Creek
Harneet Chopra, MD Telehealth
Internal medicine · 1210 Rossmoor Parkway, Walnut Creek
Mehrdad Mansouri, MD
Family medicine · 1425 South Main Street, Walnut Creek
Eva Young, DO
OB-GYN · 1515 Newell Avenue, Walnut Creek
Michael Zizmor, MD Telehealth
Internal medicine · 710 South Broadway, Walnut Creek
Sumana Kesh, MD
Internal medicine · 710 South Broadway, Walnut Creek
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 Castle Hill, 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.
John Muir at Rossmoor Phcy
0.8 mi
0.9 mi Carelink Pharmacy
1.1 miKaiser Permanente Pharmacy No 515
1.3 mi
1.5 mi Ridgecrest Pharmacy
1.6 miShowing the 6 closest pharmacies to Castle Hill, 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 Castle Hill, 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
From $0 insured
Telehealth PrEP & DoxyPEP with at-home testing and ongoing monitoring
Visit from $0 insured
Telehealth STI treatment and sexual-health care, delivered or to your pharmacy
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 Contra Costa County, the county that includes Castle Hill, compare with California and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~8% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#19 of 58 California counties for chlamydia, a higher rate than 67% of the state
| Infection | Contra Costa County | California | United States |
|---|---|---|---|
| Chlamydia | 427.7 4,940 cases ▼ 13% | 491.1 | 492.2 |
| Gonorrhea | 127.9 1,477 cases ▼ 33% | 190.2 | 179.5 |
| Syphilis (P&S) | 13.2 153 cases ▼ 19% | 16.3 | 15.8 |
| Syphilis (early) | 9 104 cases ▼ 53% | 19.1 | 16 |
| Syphilis (late/unknown) | 22.3 257 cases ▼ 52% | 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 Contra Costa County, chlamydia has risen from 386.3 to 427.7 per 100,000 (11%), gonorrhea has fallen from 177.7 to 127.9 per 100,000 (28%), and P&S syphilis has fallen from 15.5 to 13.2 per 100,000 (15%).
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 Contra Costa County.
Local HIV snapshot
Contra Costa County HIV care continuum (2023)
Contra Costa County recorded 12.7 new HIV diagnoses per 100,000 (2023), against 14.9 statewide and 13.7 nationally. Among Contra Costa County residents living with HIV, 80.2% are in care · 73.4% 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 Contra Costa County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Castle Hill draws young adults who settle into established neighborhoods like Rossmoor and San Miguel, often moving in with extended family or building toward homeownership in a community where staying put spans decades. That rootedness shapes how people approach health decisions here, discretion matters when you're building a life alongside neighbors you'll know for years. STD testing in and around Castle Hill listed on this page reflects that reality: clinics understand that confidentiality isn't theater but basic respect, and results remain between you and your provider, period. Routine screening during your twenties and thirties (whether you're partnered, newly dating, or navigating a relationship shift) fits into the practical health maintenance that Castle Hill residents tend to prioritize.
The testing sites available here are accustomed to serving people who value straightforward, judgment-free care without fanfare. You get tested, you move forward with clarity, and your privacy stays intact. Access to confidential STI screening here means you don't have to travel far or wonder whether your information will circulate through a small-town network. The clinics and urgent care centers serving Castle Hill take that trust seriously, offering the screening options you need without requiring you to explain yourself or justify the visit.
Getting there
At 8.2/20 on the EPA walkability index, day-to-day errands in Castle Hill generally mean driving: plan on a car or rideshare to reach a clinic, and check each listing's hours and phone before you go.
Source: EPA National Walkability Index 2021.
ZIP 94595 snapshot
ZIP-level Census figures for the wider 94595 area around Castle Hill: a single ZIP can span several communities, so they describe the area, not Castle Hill alone.
Castle Hill sits in Contra Costa County, ZIP 94595. Local context that shapes where residents test:
Local landmarks
Neighborhoods & communities
Major routes
Nearby cities & towns
Just outside Castle Hill? 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 Contra Costa 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 Castle Hill-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 Castle Hill 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.
There are 7 options within a 30-mile drive.
Usually yes, it can be billed to insurance, or paid out of pocket at a flat rate.
Yes, free HIV testing is available at public clinics in the area.
A full panel typically covers chlamydia, gonorrhea, syphilis, HIV, and hepatitis B and C.
Contra Costa County reported ~428 chlamydia cases per 100,000 in 2023, below the California average.
Yes, PrEP, a daily pill that helps prevent HIV in HIV-negative people, is available in the area.
In California, people under 18 can consent to confidential STD testing and treatment on their own.
Get treated, notify partners, pause sex until cleared, and follow up, the infection is manageable.
Yes, site matters; oral/anal exposure needs a throat or rectal swab, which urine testing won't catch.
Reassuring if you tested after the window, just retest if it was early, and screen again with new partners.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.