How to Test Your Drinking Water During Water Quality Month

Written by: Scott Steveson, Specialist, Wellness Quality Institute

Key Takeaways for Safer Home Water

• National Water Quality Month in August gives U.S. homeowners a clear reminder to schedule certified lab testing of their drinking water.
• City-water customers should test for lead, pH, and hardness at move-in or after plumbing work. Private-well owners need annual bacteria and nitrate tests, plus comprehensive chemistry every three years.
• Home test kits help with basic screening but do not provide reliable results for health-critical issues such as bacteria, lead, or nitrates. Certified laboratories are required for those.
• Five key parameters, total coliform and E. coli, nitrates, lead, pH, and hardness, cover the most common health and infrastructure risks for American households.
• After you receive verified lab results, homeowners and brands can use independent review services from The Wellness Quality Institute to support water-quality or plastic-free claims.

City Water vs. Private Well Water: Recommended Tests and Timing

The table below connects your water source to the right testing panel and a minimum testing schedule. City water customers receive an annual Consumer Confidence Report (CCR), which is a summary of utility test results required under the Safe Drinking Water Act. That report describes the water leaving the treatment plant, not the water at your tap after it passes through your home plumbing.

Supply Type	Recommended Panel	Minimum Frequency	Key Trigger Events
City / Municipal	Lead (tap sample), pH, hardness	Lead: every 3 years. pH and hardness: at move-in or after plumbing work.	Home built before 1986, new baby or pregnancy, plumbing renovation, change in taste or color
Private Well	Total coliform bacteria, E. coli, nitrates, pH, hardness	Bacteria and nitrates: annually. pH, hardness, and comprehensive chemistry: every 3 years. Lead: at least once, then annually for pre-1987 plumbing.	Flooding, well or pump repair, new well installation, home sale or transfer, change in taste, odor, or appearance

The federal government does not monitor private well water quality. About 43 million people in the United States who rely on private wells must manage their own testing schedules.

How Often to Test Your Drinking Water

A practical testing plan combines a fixed annual baseline with extra tests when something changes. Typical certified lab costs range from roughly $25–$50 for a basic bacteria and nitrate panel to $150–$400 or more for a comprehensive chemistry screen that includes lead and other metals. Standard panels usually return results within 5–10 business days.

1. Annual baseline for all well owners. Test for total coliform bacteria, E. coli, and nitrates. Cost is approximately $25–$75. Turnaround is usually 5–7 business days.
2. Every 3 years for well owners. Order a comprehensive chemistry panel that covers pH, hardness, alkalinity, total dissolved solids, and metals including lead and copper. Cost is approximately $150–$400. Turnaround is usually 7–10 business days.
3. At move-in or after plumbing work for city and well water. Test a lead tap sample, pH, and hardness to create a household baseline that does not rely only on utility data.
4. After flooding or well repair for well owners. Test bacteria and nitrates right away. Avoid using the water for drinking or cooking until results confirm that it is safe.
5. Before or during pregnancy, or when an infant joins the household. Test for nitrates and lead, even if your last test was recent.
6. When taste, odor, or color changes. Order a full panel that includes bacteria, nitrates, pH, hardness, and lead.

Home Test Kits vs. Certified Labs

Home test kits work well for quick checks, but certified laboratories are the standard for health decisions. A kit can help you decide whether to investigate further, while a lab report gives you data you can trust.

Home kits are generally sufficient for:

• Screening hardness and pH at a basic level to decide whether more testing is needed
• Monitoring free chlorine in city water as a routine check
• Confirming that a water softener is working as expected

A certified laboratory is required when:

• Testing for bacteria such as total coliform or E. coli, because home kits are unreliable at low levels
• Testing for any level of lead, since both the sampling method and the detection limit strongly affect results
• Testing for nitrates near or above the EPA limit, because a missed problem can harm infants
• Results will support a real estate transaction, legal matter, or regulatory requirement
• Any home kit result looks unexpected, high, or unclear

Water-quality practitioners agree that any unexpected home kit result should trigger confirmation testing at a state-certified laboratory before you choose or install treatment.

Five Core Drinking Water Tests That Matter Most

Five core parameters cover the most common health and infrastructure risks for U.S. homeowners. The table below lists each parameter, its EPA standard, and what an out-of-range result means in everyday language.

Parameter	EPA Standard	Health or Infrastructure Risk	Primary Concern
Total Coliform Bacteria / E. coli	Zero detected per 100 mL (MCL)	Any detection shows a pathway for contamination. E. coli points to fecal contamination and creates an immediate health emergency.	Well owners, and homes after flooding or plumbing repair
Nitrates	10 mg/L as nitrogen (MCL)	Levels above the MCL can cause methemoglobinemia, also called blue baby syndrome, in infants under 6 months by reducing blood oxygen. Long-term exposure in adults is linked to higher colorectal cancer risk.	Well owners near farms or septic systems, and households with infants
Lead	Action Level: 15 ppb. MCLG: zero.	Lead is a neurotoxin with no safe exposure level for children. It can cause developmental delays and reduced IQ. It often leaches from lead service lines, lead solder, and brass fixtures, especially when water is acidic.	Homes built before 1986, and any home with older plumbing on city or well water
pH	SMCL range: 6.5–8.5 (secondary or aesthetic standard)	Water below 6.5 is corrosive and speeds up leaching of lead and copper from plumbing. Water above 8.5 can cause scale and a bitter taste.	Well owners and older homes with metal plumbing
Hardness	No federal health-based MCL	Hardness is not a direct health risk at normal levels. It causes scale in pipes and appliances, reduces soap effectiveness, and shortens appliance life. The USGS classifies water above 121 mg/L as hard.	Infrastructure and appliance protection, and a general indicator of water chemistry

A USGS analysis of private wells found that 23% of 1,389 wells contained at least one contaminant above a human-health benchmark such as a USEPA MCL or USGS HBSL. This result shows why routine testing is essential for well owners.

How to Select a State-Certified Water Testing Lab

State-certified laboratories provide the only reliable option for health-related drinking water testing. The steps below apply in any state.

1. Start with your state laboratory directory. Every state maintains a list of laboratories certified under its drinking water program. Search for your state name plus “certified drinking water laboratory,” or contact your state health department. The EPA also maintains a national directory of state certification programs.
2. Confirm the lab’s accreditation scope. Check that the lab’s current scope of accreditation document lists the specific EPA method, the target analytes such as lead, and the drinking water matrix before you send samples. This detail matters because accreditation is matrix specific, and a lab accredited for industrial wastewater is not automatically qualified for residential drinking water.
3. Check accreditation status. Confirm the lab’s accreditation body, certificate number, and current status. The certificate should be active, not expired or suspended. NELAP, the National Environmental Laboratory Accreditation Program, or TNI, The NELAC Institute, accreditation is widely accepted for drinking water labs.
4. Request sampling instructions before collection. Lead testing needs a first-draw sample after at least 6–8 hours of no water use. Bacteria samples need sterile bottles supplied by the lab. Using the wrong container or method can invalidate results.
5. Ask about turnaround time and cost upfront. Confirm that the lab’s quoted timing and pricing match the ranges described earlier, including standard panels in about one week and higher costs for full chemistry screens.
6. Confirm chain-of-custody procedures. Labs should use chain-of-custody forms, which document sample handling from collection through analysis. These records keep results legally and scientifically defensible.

How to Read and Act on Your Lab Report

A lab report compares each result to a federal standard. The main standard types are a Maximum Contaminant Level, or MCL, for health-based contaminants, a Secondary Maximum Contaminant Level, or SMCL, for taste and appearance issues, and an Action Level for lead and copper, which triggers follow-up steps instead of acting as a simple pass or fail limit. The table below turns each parameter’s result into a clear action step.

Parameter	Result Range	What It Means	Action Step
Total Coliform / E. coli	Any detection	Confirms a contamination pathway. E. coli indicates fecal contamination and creates an immediate health emergency.	Stop using the water for drinking and cooking immediately, contact your county health department, shock-chlorinate, and retest within 1–2 weeks.
Nitrates	Above 10 mg/L (as N)	Exceeds the EPA MCL and is unsafe for infants under 6 months.	Do not use tap water for infants, install point-of-use reverse osmosis, and test quarterly. Conventional filtration and chlorination do not remove nitrates.
Lead	Above 15 ppb (Action Level)	Exceeds the EPA Action Level, and no safe level exists for children.	Install an NSF/ANSI 53-certified point-of-use filter, flush the tap for 60 seconds before use, and assess plumbing for lead service lines or solder.
pH	Below 6.5	Indicates corrosive water that speeds up leaching of lead and copper from plumbing.	Test for lead and copper and consider a calcite acid-neutralizing filter.
Hardness	Above 121 mg/L (about 7 grains per gallon)	Indicates hard water, which does not pose a direct health risk but causes scale and appliance wear.	Consider a water softener and monitor plumbing and appliances for scale buildup.

Units on the report matter. Confusing mg/L with µg/L can make a result appear 1,000 times higher or lower than it really is. Check the unit column carefully before you react. When a result exceeds a health standard, confirm it with a second sample before you buy treatment equipment, because sampling technique can change bacteria and lead readings.

Each major result on your report represents a verified data point. Once you hold that independent laboratory dataset, you have a solid base for any claim about your water, whether for personal choices, real estate disclosure, or, for brands and businesses, product-level statements.

Frequently Asked Questions

How often should I test my well water for bacteria?

Annual testing for total coliform bacteria and E. coli is the standard guidance from state health departments and university extension programs. You should also test immediately after flooding, well or pump repairs, nearby construction, or any change in taste, odor, or color, even if your last scheduled test was recent.

What is the difference between an MCL and an Action Level for lead?

A Maximum Contaminant Level, or MCL, is a legally enforceable limit on a contaminant in water from a public system. An Action Level for lead and copper is a concentration that, if exceeded in more than 10% of tap samples, requires the water utility to respond with steps such as corrosion control or public notice. The EPA’s health goal, called the MCLG, for lead is zero because no safe level of exposure has been identified. Use the 15 ppb Action Level as your practical trigger to investigate or install treatment at home, and review the standard types described earlier for added context.

Are home test kits reliable for nitrates and bacteria?

Home kits do not provide reliable low-level detection for nitrates or bacteria. They work better for basic checks of hardness, pH, and free chlorine. For nitrates and bacteria, which both carry direct health risks if missed, a state-certified laboratory is the appropriate choice. Any unexpected home kit result should be confirmed with certified lab testing before you make health or treatment decisions.

What does a pH result outside the 6.5–8.5 range mean for my plumbing?

Water with a pH below 6.5 is corrosive and speeds up leaching of lead, copper, iron, and zinc from pipes, solder joints, and fixtures into your drinking water, even when the source water is clean. A low pH result should prompt testing for those metals and consideration of a calcite acid-neutralizing filter. Water above pH 8.5 can cause scale and a bitter taste but usually presents less urgent health concern.

How do I know if my city water report covers the water at my tap?

The annual Consumer Confidence Report from your utility describes water quality as it leaves the treatment plant and enters the distribution system. It does not fully reflect conditions at your tap. Lead often enters water after it leaves the main, through lead service lines, lead solder in older homes, or brass fixtures. The only way to know what comes from your tap is to test at the tap using a first-draw sample collected after at least 6–8 hours of no water use, as discussed earlier in the city versus well section.

What should I do if my results exceed an EPA standard?

For any result above a health-based MCL or the lead Action Level, confirm the finding with a second sample before you purchase treatment equipment, because sampling technique can affect readings. The detailed action steps for bacteria, nitrates, lead, pH, and hardness appear in the “How to Read and Act on Your Lab Report” table above. In summary, stop drinking and cooking use for contaminated water, protect infants from high nitrates, install certified filters for lead, and address low pH that can increase metal leaching. Your state health department or a licensed well contractor can help interpret results and choose effective fixes.

Next Steps After You Have Your Lab Data

Independent laboratory data forms the base for any credible statement about water quality, whether you want peace of mind, need to disclose information in real estate, or plan to make product claims as a brand. Once a homeowner or company holds a verified, independent dataset, The Wellness Quality Institute (WQI) offers an optional review service for companies that make plastic or microplastic-related claims about their water or liquid products.

The Wellness Quality Institute’s Plastic-Free Pathway Verification program reviews a company’s existing third-party lab data against defined criteria that align with a state water board’s drinking water microplastics reference framework. The program then issues a scope-locked verification decision and a public registry listing. Participation carries no public downside risk because a Standard Not Met outcome remains private. Submission is voluntary, and verification is available to U.S. companies nationwide, not only those based in California.

Learn more about reducing plastic exposure for your body and the planet, or explore plastic-free certification for your company.