Is Your Drinking Water
Actually Safe?
Your tap water travels through miles of aging infrastructure before reaching your glass. What it picks up along the way could be affecting your health right now.
Why You Can't Trust Your Tap Without Testing
The EPA regulates only 90 contaminants in drinking water — but over 300 have been detected in U.S. tap water. Your utility's annual Consumer Confidence Report tests water at the treatment plant, not at your tap. What happens between the plant and your glass matters.
EPA vs. WHO Standards Comparison
The EPA and WHO often set different limits for the same contaminants. In many cases, health-based goals are significantly stricter than enforceable maximums — meaning "legal" doesn't always mean "safe."
| Contaminant | EPA MCL | EPA MCLG | WHO Guideline |
|---|---|---|---|
| Lead | 15 ppb (AL) | 0 ppb | 10 ppb |
| PFOA | 4 ppt | 0 ppt | 100 ppt |
| PFOS | 4 ppt | 0 ppt | 100 ppt |
| Arsenic | 10 ppb | 0 ppb | 10 ppb |
| THMs (total) | 80 ppb | N/A | Various |
| Nitrate | 10 ppm | 10 ppm | 50 ppm |
| Chromium-6 | 100 ppb (total Cr) | Under review | 50 ppb |
MCL = Maximum Contaminant Level (enforceable). MCLG = Maximum Contaminant Level Goal (health-based, non-enforceable). AL = Action Level.
Key Contaminants in Drinking Water
Explore the most critical contaminants found in U.S. drinking water. Each card includes EPA/WHO limits, health effects, and the science behind the risk.
Lead (Pb)
9.2 million U.S. homes have lead service lines
Health Effects
- Irreversible neurological damage in children
- Kidney damage and hypertension in adults
- Developmental delays and learning disabilities
- No safe level of exposure established by CDC
PFAS (Forever Chemicals)
49% of U.S. tap water contains detectable PFAS
Health Effects
- Linked to kidney and testicular cancer
- Thyroid disease and immune suppression
- Reproductive issues and developmental effects
- Liver damage at chronic low doses
Chlorine & Disinfection Byproducts
98% of U.S. municipal water is chlorinated
Health Effects
- Trihalomethanes (THMs) linked to bladder cancer
- Haloacetic acids associated with reproductive issues
- Chloramine can cause digestive issues
- Taste and odor complaints at >1 ppm
Microplastics
83% of tap water samples worldwide contain microplastics
Health Effects
- Inflammatory response in gut tissue
- Potential carrier for absorbed chemicals (BPA, phthalates)
- Nano-plastics can cross cellular membranes
- Long-term effects still under active research
Bacteria & Pathogens
7.2 million illnesses/year from waterborne pathogens in U.S.
Health Effects
- Gastrointestinal illness (E. coli, Giardia)
- Legionnaires' disease from Legionella in plumbing
- Cryptosporidium resistant to chlorine disinfection
- Severe risk for immunocompromised individuals
Nitrates & Nitrites
22 million Americans exposed to elevated nitrates
Health Effects
- Blue baby syndrome (methemoglobinemia) in infants
- Associated with colorectal cancer risk
- Thyroid disruption at chronic exposure
- Agricultural runoff is primary source
How Contaminated Water Affects Your Food
Cooking doesn't eliminate water contaminants — in many cases, it concentrates them. Understanding how water interacts with food preparation is essential for protecting your family.
Boiling Concentrates Contaminants
Boiling water removes pathogens but actually increases the concentration of lead, nitrates, PFAS, and other chemical contaminants as water evaporates. A pot boiled down by 50% doubles the contaminant concentration.
Coffee & Tea Absorb More Lead
Hot water leaches lead from pipes 2–5x faster than cold water. Studies show tea prepared with lead-contaminated water absorbs additional lead into the leaves, increasing total intake by up to 80%.
Pasta & Rice Absorb Water Chemicals
Foods cooked in water absorb up to 60% of waterborne contaminants. Rice is particularly efficient at absorbing arsenic and PFAS from cooking water, according to FDA studies.
Baby Formula — Highest Risk
Reconstituted formula is an infant's sole nutrition source. Lead, nitrates, and PFAS in water used for formula preparation pose the greatest risk to developing brains and immune systems.
Who's Most at Risk?
Contaminant exposure doesn't affect everyone equally. These populations face disproportionate risk from drinking water contamination.
Infants & Young Children
6x more vulnerableChildren drink 2.5x more water per pound of body weight than adults. Lead exposure at any level causes irreversible IQ reduction — an estimated 3–5 IQ points lost per 5 ppb increase in blood lead.
Pregnant Women
Critical exposure windowPFAS exposure during pregnancy is linked to low birth weight, preeclampsia, and developmental delays. Nitrate exposure above 5 ppm is associated with neural tube defects and preterm birth.
Elderly & Immunocompromised
Reduced detox capacityAging kidneys and livers process contaminants less efficiently. Cryptosporidium and Legionella pose severe, potentially fatal risks to those with weakened immune systems.
Chronic Exposure (All Ages)
Cumulative lifetime riskMany contaminants like PFAS, arsenic, and DBPs accumulate over years. Cancer risk calculations are based on 70 years of daily exposure — the effects are rarely immediate but deeply consequential.
Inside the Lab: How We Analyze Your Water
Our certified lab partner uses EPA-approved analytical methods — the same techniques employed by municipal water systems and regulatory agencies.
Analytical Methods
Microscopy Image Placeholder
Microscopy analysis of water sample
High-resolution imaging coming soon
Know What's in Your Water
Our comprehensive $99 test kit analyzes 100+ contaminants using EPA-certified methods. Get clear, actionable results with a personalized report and free consultation.
WaterVo customers: Purchase any WaterVo machine ($599+) within 90 days and receive a full $99 refund on your testing fee.
Water Testing for Every Use Case
Drinking water is just the beginning. Discover how water quality affects every aspect of your home.