Affiliate disclosure: Private Well Guide (privatewellguide.com) earns a commission from some links on this page, at no extra cost to you. We have not tested these kits ourselves. The comparison below uses each seller’s published product information (checked October 11, 2026) plus guidance from CDC, EPA and university researchers. As an Amazon Associate I earn from qualifying purchases.
Health note: For decisions about drinking water safety, CDC and EPA recommend a state-certified laboratory. If a kit shows a problem, confirm it with a certified lab and contact your local health department.
First, check the option that isn’t a kit
Your local health department may test well water for little or nothing. EPA notes some provide private well testing for free. You can also find a nearby state-certified lab through EPA’s directory Find a state-certified lab (EPA directory) →. For a basic bacteria-and-nitrate test, call them first.
How we compared (published specs and lab documentation only)
- Who analyzes the sample: you (DIY), or a lab?
- Does it cover the CDC/EPA annual baseline: coliform bacteria, nitrate, pH, TDS (CDC)?
- Add-ons: metals (arsenic, lead), PFAS, radiologicals.
- Bacteria logistics: how the sample gets to the lab.
- Price: listed only if we confirmed it on the seller’s page on the date above. Otherwise, check the current price.
Quick comparison
| Kit | Type | What the seller says it covers | Listed price (Oct 11, 2026) |
|---|---|---|---|
| Tap Score Essential Well Water Test | Mail-in, certified lab | Heavy metals (25), minerals (4), hardness, turbidity, silica, nitrate, nitrite, coliform bacteria incl. E. coli; lab turnaround 5 business days | $209 · Tap Score: Essential well water test → |
| Tap Score Advanced Well Water Test | Mail-in, certified lab | Broader well panel; overnight shipping to the lab with an insulated cooler, which matters for bacteria | $399 · Tap Score: Advanced well water test → |
| Tap Score PFAS tests | Mail-in lab | PFAS panels (several versions) | Check current price · Tap Score: PFAS water test → |
| WaterTestingKits.com Well Water Test Kit | DIY | Chlorine, copper, nitrate/nitrite, iron, alkalinity, pH, hardness, bacteria | Check current price (listed as out of stock on Oct 11) · WaterTestingKits.com: well water test kit → |
| WaterTestingKits.com Bacteria in Water Test | DIY | Screens for coliform and E. coli; results in 48 hours, per the seller | Check current price · WaterTestingKits.com: bacteria water test → |
| Health Metric Well Water Test Kit | DIY | See the listing for parameters | Check current price · Health Metric well water test kit on Amazon → / Shop Health Metric well water test kit on Amazon → |
| Safe Home lab test kits | Mail-in lab | See the seller’s site | Check current price · Safe Home Test Kits: well water lab test → |
Sources: Tap Score Essential, Tap Score Advanced, Tap Score PFAS, WaterTestingKits well kit, WaterTestingKits bacteria test.
Mail-in lab kits: best for real answers
Choose this if you’re testing a well for the first time, buying a home, have an infant in the house, or need a result you’ll base treatment decisions on.
- Tap Score Essential is the lower-cost well panel. Its listed panel includes the metals (arsenic, lead) and the nitrate and bacteria tests most well owners need. Tap Score describes its labs as independent, certified and accredited.
- Tap Score Advanced costs more, but the seller says it includes overnight shipping to the lab in an insulated cooler. Bacteria samples are time-sensitive, so that matters if bacteria is your main concern. The seller also says it’s more thorough than the Essential kit.
- PFAS is a separate, specialized test. Check which PFAS compounds a kit reports before ordering. PFAS in Private Wells: Testing and Treatment
Ask any mail-in lab whether it’s certified for each test in your state. Some states’ rules, such as home-sale testing, require a state-certified lab.
DIY kits: best for screening and monitoring
Choose this if you want a quick check between annual lab tests, or you want to confirm a softener or iron filter is still working.
Know the limits. A UMass Amherst study of eight home kits that measure iron, copper, manganese and fluoride found “high variability”: some kits worked well and others didn’t. The researchers noted that single-parameter kits and multi-parameter strips behave differently. DIY strips also can’t measure contaminants like arsenic, PFAS or uranium at the low levels that matter for health.
If a DIY kit shows bacteria or high nitrate, confirm with a certified lab and call your health department.
Hardness and iron strips for softener checks: WaterTestingKits.com: hardness test strips → · Shop water hardness test strips on Amazon →
Which should you buy?
| Situation | Best fit |
|---|---|
| Annual bacteria + nitrate check | Health department or local certified lab |
| First test / buying a home | Mail-in lab well panel, or a local lab’s comprehensive panel |
| Bacteria worries (after a flood, after well work) | Local lab or health department (shortest transit time), or a mail-in kit with overnight cold shipping. Disinfect first if needed: How to Shock Chlorinate a Well, Step by Step |
| Monitoring a softener or iron filter | DIY strips |
| PFAS near a known source | Lab PFAS test; also contact your state PFAS program |
More detail: Tap Score vs Your State-Certified Lab vs DIY Strips · What to Test Your Well Water For (and What You Can Skip)
Sources
- CDC, Guidelines for Testing Well Water: https://www.cdc.gov/drinking-water/safety/guidelines-for-testing-well-water.html
- EPA, Protect Your Home’s Water: https://www.epa.gov/privatewells/protect-your-homes-water
- EPA, Certified lab contacts: https://www.epa.gov/dwlabcert/contact-information-certification-programs-and-certified-laboratories-drinking-water
- UMass Amherst, home test kit study: https://www.umass.edu/engineering/news/kumpel-home-water-tests
- Seller product pages linked above (checked Oct 11, 2026)
Private Well Water Testing: The Complete Guide for Rural Homeowners (2026)