At-Home Testing Guide
You cannot optimize what you do not measure. Testing your water, air, and body gives you a baseline. But the gap between a $15 test strip and a $400 lab panel is enormous, and knowing which level of testing you actually need saves both money and false confidence.
Water testing
Professional lab testing: SimpleLab Tap Score
SimpleLab's Tap Score service ($150-$400 depending on panel) sends you collection vials, you fill them from your tap, and return them to an ISO 17025 accredited lab. Results cover 100+ analytes including heavy metals (via ICP-MS), PFAS, pesticides, VOCs, bacteria, and radioactive contaminants.
Essential Water Test (~$150): covers metals, bacteria, physical properties. Good starting point. Advanced (~$250): adds VOCs, PFAS screening, pesticides. Extended (~$400): comprehensive panel including radiologicals.
Results include specific concentrations (not just pass/fail), comparison against EPA MCLs and health guidelines, and a risk assessment score. This is the closest a consumer can get to a professional COA for their own tap water.
DIY test strips: $15-$30
Colorimetric strip tests (Varify, JNW, Health Metric) test for pH, hardness, chlorine, lead, iron, copper, nitrate, and bacteria. You dip a strip, compare the color to a chart, and get a rough reading.
What they miss: strips cannot detect PFAS, arsenic (at relevant levels), VOCs, pesticides, or radioactive contaminants. Lead strips have a detection threshold around 15 ppb -- they will not catch lead at 5-14 ppb, which is still a health concern, especially for children. The color comparison is subjective and easily misread.
Use case: a quick sanity check or a first-pass screen that might reveal obvious problems (extremely high lead, no chlorine residual, high nitrates). Not a substitute for lab testing if you want actionable data.
When to test: when moving into a new home, after plumbing work, if you have a private well (test annually), if your municipality has a history of violations, or before investing in a filtration system. Test before you filter, so you know what you are filtering for.
Air quality monitors
Consumer air quality monitors ($100-$300) typically measure PM2.5 (fine particulate matter), PM10, VOCs (total, not individual compounds), CO2, temperature, and humidity. Brands include Airthings, AirGradient, and Purple Air (outdoor focused).
PM2.5 monitoring is genuinely useful -- particulate matter is the air pollutant with the strongest evidence for health impact. Indoor PM2.5 spikes during cooking, burning candles, or during wildfire season reveal exposure you cannot see or smell. CO2 monitoring reveals ventilation quality -- levels above 1,000 ppm indicate inadequate fresh air exchange.
Limitation: consumer VOC sensors measure total volatile organic compound load but cannot identify specific compounds. They will not tell you if your indoor air contains formaldehyde from furniture off-gassing versus cooking fumes. Professional air quality testing (IAQ assessments) runs $300-$800 and identifies specific compounds.
Heavy metal blood tests
Blood Lead Level (BLL): the standard test for lead exposure. The CDC reference value is 3.5 mcg/dL for children (lowered from 5 mcg/dL in 2021). For adults, levels below 5 mcg/dL are considered the reference range, though there is no known safe level. A venous blood draw is more accurate than a finger-prick capillary sample. Cost: $20-$80 through a doctor or direct-access lab (Quest, LabCorp).
Mercury: blood mercury reflects recent exposure (primarily methylmercury from fish). Hair mercury reflects longer-term exposure. Urine mercury reflects inorganic and elemental mercury exposure (dental amalgams, occupational). Each measurement tells a different story.
Arsenic: urine arsenic (24-hour or spot) with speciation (distinguishing organic from inorganic arsenic) is the preferred test. Total arsenic alone is misleading because seafood raises organic arsenic, which is considered non-toxic.
Hair mineral analysis
Hair Tissue Mineral Analysis (HTMA) claims to reveal mineral status and toxic metal exposure over 2-3 months (the time the hair was growing). Labs like Doctor's Data and Trace Elements Inc. offer panels for $75-$150.
The controversy: HTMA is not well-standardized. External contamination (shampoo, hair dye, pool water) affects results. Different labs using different washing procedures on the same hair sample produce different results. A 2001 JAMA study sent identical hair samples to multiple HTMA labs and received conflicting results and contradictory recommendations.
HTMA may have utility as a screening tool for extreme toxic metal exposure (very high mercury, arsenic, or lead) but is unreliable for nuanced mineral status assessment. Blood and urine tests are more validated for clinical decision-making.
When professional testing is worth it
Water: always worth the $150+ for lab testing if you have a private well, young children, are pregnant, or live in a home built before 1986 (lead solder in pipes). DIY strips are inadequate for these scenarios.
Blood metals: worth it if you have known exposure risk (old house with lead paint, high fish consumption, occupational exposure, living near industrial sites). A baseline BLL costs less than a restaurant dinner.
Air: consumer PM2.5/CO2 monitors provide genuinely useful continuous data. Professional IAQ testing is worth it for persistent unexplained symptoms (headaches, respiratory issues) in a specific indoor environment.