In Placer County, reported syphilis runs about 75% lower than the U.S. average. If you've had a recent risk or just test regularly in Colfax, California, community and public clinics are often low-cost or free, whereas private labs tend to offer faster results and more flexible scheduling. See options below.
Available testing centers
7 testing options are listed for Colfax, CA. The nearest, Quest Diagnostics, is about 10.6 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.
Nevada County Citizens for Choice in Grass Valley charges nothing for STI and HIV testing: free across the board, with Medicaid and private insurance also accepted. The clinic tests for gonorrhea, chlamydia, herpes, and HIV, treats bacterial infections and hepatitis B on-site, and offers walk-in appointments.
Every service at Nevada County Citizens for Choice (testing, treatment, education, condoms) carries no charge, and Medicaid or private insurance can be billed if you have it. That means the fee structure never becomes a reason to skip a follow-up or leave a service on the table.
Spanish is available as a direct mode of care at Nevada County Citizens for Choice in Grass Valley, not as an add-on. Patients whose primary language is Spanish can ask questions, understand results, and make decisions in the same conversation. Without switching registers mid-visit.
The clinic runs herpes testing through the same visit as gonorrhea, chlamydia, and HIV. A single blood draw or swab collected and processed on-site rather than through a separate referral order. Clinicians interpret results in the context of the full panel, so herpes findings are addressed alongside everything else.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Apr 2026 · Source: CDC NPIN
Western Sierra Medical Clinic - Women's Health and Newborn Care, in Grass Valley, welcomes walk-in patients for STI screening under its federally qualified health center sliding-scale fee structure. A single visit can cover syphilis, gonorrhea, and chlamydia testing, with costs adjusted to income.
Tests offered
Fees & payment
Western Sierra Medical Clinic in Grass Valley requires an appointment, and that scheduled visit covers gonorrhea, chlamydia, syphilis, and HIV testing alongside TB screening, family planning, and hepatitis A and B vaccines: all on a sliding-scale fee accepted alongside Medicaid, Medicare, and insurance.
Languages
English, Spanish
Tests offered
Serves
Care services
Prevention services
Fees & payment
Listing verified Dec 2025 · Source: CDC NPIN + HRSA
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 about 11 miles away; if you'd rather skip the trip, an at-home kit ships to Colfax, 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 Placer 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.
11815 Education Street, Auburn, CA 95602
CMS-certified lab Accredited · College of American Pathologists
One Medical Plaza, Roseville, CA 95661
CMS-certified lab Accredited · College of American Pathologists
729 Sunrise Ave Suite 700, Roseville, CA 95661
CMS-certified lab
Source: CMS CLIA registry (Provider of Services), Q1 2026. Federal public records: active CLIA-certified laboratories near Colfax. 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, 367 primary-care, OB-GYN, infectious-disease and other clinicians have a CMS practice record within 30 miles of Colfax. They may be able to evaluate symptoms or order a confidential STD panel during a regular visit, and 188 offer telehealth.
Kurtis Fox, MD
Family medicine · 101 West Grass Valley Street, Colfax
Jameson Forshee, DO Telehealth
Family medicine · 10058 Wolf Road, Grass Valley
Pa Soua Xiong, MD Telehealth
Family medicine · 402 South Auburn Street, Grass Valley
Michael Andya, MD Telehealth
Internal medicine · 101 Margaret Lane A, Grass Valley
Erin Macdonald, MD
OB-GYN · 155 Glasson Way, Grass Valley
Marlowe Dieckmann, MD
Family medicine · 155 Glasson Way Building, Grass Valley
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 Colfax, 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.
Colfax Pharmacy
0.5 miMeadow Vista Pharmacy
7.6 mi
8.3 mi Raleys 213
9.5 miGNC
9.5 miShowing the 5 closest pharmacies to Colfax, 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 Colfax, 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.
$0 with most insurance
Free online PrEP & DoxyPEP: HIV prevention, home lab kits, no in-person visit
Visit from $39
Online STI treatment & DoxyPEP: same-day prescriptions to your pharmacy
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 Placer County, the county that includes Colfax, compare with California and U.S. averages, based on the most recent 2023 surveillance data. An estimated ~29% of residents are aged 15–34 (ACS), the age group with the highest reported chlamydia and gonorrhea rates nationally.
#48 of 58 California counties for chlamydia, a higher rate than 17% of the state
| Infection | Placer County | California | United States |
|---|---|---|---|
| Chlamydia | 197.6 837 cases ▼ 60% | 491.1 | 492.2 |
| Gonorrhea | 48.4 205 cases ▼ 75% | 190.2 | 179.5 |
| Syphilis (P&S) | 4 17 cases ▼ 75% | 16.3 | 15.8 |
| Syphilis (early) | 4 17 cases ▼ 79% | 19.1 | 16 |
| Syphilis (late/unknown) | 9.4 40 cases ▼ 80% | 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 Placer County, chlamydia has fallen from 233 to 197.6 per 100,000 (15%), gonorrhea has fallen from 64.2 to 48.4 per 100,000 (25%), and P&S syphilis has fallen from 11.4 to 4 per 100,000 (65%).
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 Placer County.
Local HIV snapshot
Placer County HIV care continuum (2023)
Placer County recorded 2.2 new HIV diagnoses per 100,000 (2023), against 14.9 statewide and 13.7 nationally. Among Placer County residents living with HIV, 81.7% are in care · 73.6% 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 Placer County tests for syphilis.
Source: CDC NCHHSTP AtlasPlus, 2023 (county-level congenital syphilis is not published).
Local resources & officials
Data & references
Local context
Howell Hill and the blocks around it capture something real about daily life in Colfax: households averaging just over three people, a slight majority renting rather than owning, and a meaningful share of residents watching budgets closely on rents that still clear a thousand dollars a month. That combination shapes how people make decisions about health care, including when and whether to schedule a screening visit. With fewer than a quarter of households clearing six figures and unemployment running notably high, an appointment that demands a long detour on the I-80 corridor can quietly lose out to a shift, a carpool obligation, or a tight week. The young adults here, people in their late teens and through their twenties, represent a significant slice of the population during the years when STI transmission runs highest and symptoms are most likely to go unnoticed.
For renters in particular, whose leases and living situations tend to shift more than those of long-term owners, consistent access to testing matters more than a single visit. A household of three sharing one car, one schedule, and one budget needs options that bend toward their reality, not against it. For anyone spending time near the Heritage Museum end of town, checking the closest listed clinic hours before the weekend is the single most concrete next step.
Getting there
At 6.71/20 on the EPA walkability index, day-to-day errands in Colfax 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 95713 snapshot
ZIP-level Census figures for the wider 95713 area around Colfax: a single ZIP can span several communities, so they describe the area, not Colfax alone.
Colfax sits in Placer County, ZIP 95713. Local context that shapes where residents test:
Local landmarks
Major routes
Nearby cities & towns
Just outside Colfax? 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 Placer 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 Colfax-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 Colfax 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.
The closest is Quest Diagnostics (10.6 mi); 7 options are within 30 miles.
Public clinics are free; private labs ~$24–$139, at-home kits $49+.
Yes, community and public clinics test the uninsured, with sliding-scale fees.
Local options test for Chlamydia, Gonorrhea, Syphilis, Herpes, Hepatitis A, Hepatitis B, Hepatitis C, Rapid HIV, a full panel covers the common ones.
About 198 cases per 100,000 residents (2023), below the California average.
Lab results typically come back in 1–2 days.
In California, people under 18 can consent to confidential STD testing and treatment on their own.
Yes, at-home kits ship to 95713; you collect a sample, mail it back, and get results in about 2–5 days.
Medical records are protected under federal HIPAA law, ask the clinic how it handles your information.
An exam can spot some signs, but most STIs are invisible without a lab test, an exam alone can't rule them out.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.