Lead Exposure Risk Calculator

Dr. Mark Wickman headshotMedical review by: Dr. Mark Wickman

Introduction: Overview: Estimating Lead Intake from Drinking Water

This calculator estimates daily lead intake from drinking water in micrograms per kilogram per day. It does not identify an acceptable exposure threshold and does not diagnose blood lead levels. Lead exposure should be reduced or stopped where possible, especially for children, pregnancy, and anyone with known or suspected exposure from paint, dust, soil, plumbing, work, hobbies, or consumer products.

Environmental concentration, intake dose, and blood lead concentration are different measurements. A water result in micrograms per liter (µg/L) is not the same as the CDC blood lead reference value, which is expressed in micrograms per deciliter (µg/dL) of blood.

Source metadata: source names: CDC Childhood Lead Poisoning Prevention materials and EPA lead in drinking-water public guidance; reference year/effective basis: CDC blood lead reference value of 3.5 µg/dL; last updated for this calculator: May 13, 2026. Limitation: this page estimates intake from drinking water only and does not model absorption, cumulative body burden, or a clinical blood lead result.

Formula Used

The calculator focuses on ingestion of lead from drinking water only. It uses:

  • Lead concentration in water (C), in micrograms per liter (µg/L), from a lab report or certified test kit.
  • Daily water intake (V), in liters per day (L/day).
  • Body weight (B), in kilograms (kg).

Plain-text formula: intakeDoseUgKgDay = (leadConcentrationUgL * waterIntakeLDay) / bodyWeightKg.

The units cancel as follows: (µg/L * L/day) / kg = µg/kg/day.

Interpreting Results Conservatively

The result reports an estimated intake dose and public-health context. It does not assign a low-risk badge. The CDC blood lead reference value of 3.5 µg/dL is a blood concentration reference used to identify children with higher blood lead levels than most children. It is not an intake dose and cannot be converted from this page's water-intake estimate without medical testing and exposure assessment.

Children, fetuses, and pregnant people require extra caution. If a child or pregnant person may be exposed, prioritize exposure reduction and consult medical or public-health professionals about testing and remediation.

Worked Example

For water containing 10 µg/L lead, daily intake of 2.0 L/day, and body weight 70 kg:

  • dailyLeadMass = 10 * 2.0 = 20 µg/day
  • intakeDose = 20 / 70 = 0.286 µg/kg/day

This number is an intake estimate from drinking water. It should be combined with a review of other sources, water testing quality, and public-health or clinical guidance.

Practical Follow-Up

  • Use certified lead-reduction filters for drinking and cooking water where appropriate.
  • Use cold water for drinking, cooking, and infant formula, then heat it if needed.
  • Flush stagnant water according to local utility or health-department guidance.
  • Work with your utility, landlord, plumber, or local agency to identify lead service lines, fixtures, or solder.
  • Consult a clinician or local health department about blood lead testing when exposure is known, suspected, or involves children or pregnancy.

Limitations

  • Water-only pathway: paint, dust, soil, food, work, hobbies, and consumer products are not included.
  • No absorption model: the tool estimates intake, not absorbed dose or blood concentration.
  • Variable water levels: lead in water can change with stagnation time, temperature, corrosion control, and sampling method.
  • Educational use: this page is not medical advice, public-health guidance, or a substitute for professional testing and remediation.

How to use this calculator

  1. Enter Lead concentration in water (µg/L) using the unit or time period shown by the field.
  2. Enter Daily water intake (L/day) using the unit or time period shown by the field.
  3. Enter Body weight (kg) using the unit or time period shown by the field.
  4. Run the calculation and compare the output with a second scenario before acting on it.

Arcade Mini-Game: Lead Exposure Risk Calculator Calibration Run

Use this quick arcade run to practice separating useful scenario inputs from common planning mistakes before you rely on the calculator output.

Score: 0 Timer: 30s Best: 0

Start the game, then use your pointer or arrow keys to catch useful inputs and avoid bad assumptions.

Enter values to estimate daily intake.