3.5 Other Environmental Lead Sources: Water, Air, Packaging, and Food
Key Takeaways
- 40 CFR 745.225(d)(2) requires risk-assessor training on environmental lead sources beyond paint—including surface dust, soil, water, air, packaging, and food—and on sampling for other sources of lead exposure.
- Paint, dust, and soil are the core media for EPA lead-based paint risk assessments in target housing/COFs, but assessors must recognize when water, occupational take-home dust, consumer products, or food/packaging pathways may explain exposure.
- Lead in drinking water is commonly associated with lead service lines, lead solder, and brass fixtures; first-draw and flushed sampling protocols differ from ASTM dust/soil methods and are often coordinated with water utilities or public-health agencies.
- Airborne lead is primarily an occupational/OSHA concern during disturbance; risk assessors still note visible dust-generation pathways that can settle as household dust hazards.
- When non-paint sources are suspected (especially in EBLL investigations), the risk assessment report should document the limitation/referral rather than silently treating paint/dust/soil as the only possible pathway.
3.5 Other Environmental Lead Sources: Water, Air, Packaging, and Food
EPA's risk-assessor curriculum in 40 CFR 745.225(d)(2) expressly includes:
- Sources of environmental lead contamination such as paint, surface dust and soil, water, air, packaging, and food
- Sampling for other sources of lead exposure
A competent risk assessor therefore understands the classic LBP media package and when another pathway may be driving exposure—especially in elevated blood lead level (EBLL) response work.
The Core LBP Media Still Come First
For target housing and child-occupied facilities, Subpart L risk assessments center on:
| Medium | Why it matters | Typical methods |
|---|---|---|
| Paint | Source reservoir of lead | XRF / paint-chip sampling |
| Dust | Primary indoor exposure pathway for young children | ASTM E1728 wipes |
| Soil | Outdoor ingestion / track-in pathway | ASTM E1727 composites |
Other sources rarely replace those media, but they can add exposure or explain EBLL cases when paint/dust/soil results are low.
Water (Potable)
Common building-related water-lead contributors:
- Lead service lines
- Lead-containing solder on copper plumbing (historically)
- Brass/bronze faucets and valves that leach lead
- Long stagnation times in infrequently used taps (child-care classrooms, guest baths)
How water sampling differs from dust/soil work
- Often uses first-draw (stagnant) and flushed samples under drinking-water protocols, not ASTM E1728 templates
- Results are typically expressed as µg/L (ppb), not µg/ft²
- Coordination with the water utility, local health department, or a drinking-water sampler is common
- Risk assessors should not invent a dust-wipe-style water method on the exam or in the field
Document plumbing materials observed (visible solder, older brass fixtures, known lead service line inventories) and refer water testing when interviews or EBLL investigations point to drinking-water exposure.
Air
Airborne lead is primarily regulated as an occupational hazard under OSHA (for example 29 CFR 1926.62) during sanding, blasting, welding, or demolition. For residential risk assessment:
- Visible disturbance activities can generate lead aerosols that settle as dust on floors and sills
- HVAC systems can redistribute settled dust
- Personal air monitoring is generally an industrial-hygiene task, not a standard Subpart L risk-assessment deliverable
Assessors should note active renovation/abatement without containment as a dust-generation condition and recommend work stoppage / lead-safe practices rather than attempting ad-hoc air cassette programs unless contracted and qualified to do so.
Packaging and Food / Consumer Products
Non-housing sources that appear in EBLL differential diagnosis teaching:
- Imported candies, spices, or ceremonial powders
- Lead-glazed cookware or pottery
- Some cosmetics / eye products (for example traditional kohl/surma in some communities)
- Contaminated packaging pigments or inks (less common, but historically documented in product recalls)
- Hobby materials (fishing weights, stained-glass solder) and occupational take-home dust on work clothes
These are rarely "sampled" with ASTM E1728. The assessor's job is to recognize the pathway during the background interview and coordinate with public-health investigators when an EBLL case suggests a non-paint source.
Integrating Other Sources into the Risk Assessment
Practical decision rules:
- Always complete the paint/dust/soil scope required by 745.227(d).
- If background/EBLL information implicates water, consumer products, or occupational take-home dust, document the suspicion and recommend the appropriate specialist testing/referral.
- Do not dismiss deteriorated LBP hazards merely because another source is also present—multiple pathways can co-exist.
- In the report's hazard narrative, separate LBP hazards identified under Subpart L from other potential lead sources outside the LBP media package.
Exam-Ready Comparison
| Source | Primary metric | Typical owner of sampling | Appears in standard LBP RA? |
|---|---|---|---|
| Paint | mg/cm² or % by weight | Risk assessor / inspector | Yes |
| Dust | µg/ft² | Risk assessor | Yes |
| Soil | ppm (µg/g) | Risk assessor | Yes |
| Water | µg/L | Water utility / DW specialist / health dept | Referral / coordinated |
| Air | µg/m³ | IH / OSHA compliance | Occupational context |
| Food/packaging/products | Product-specific | Public health / consumer product labs | Interview + referral |
EBLL Investigation Coordination
When a local health department refers an EBLL case:
- Complete the Subpart L paint/dust/soil risk assessment scope.
- Share intact-paint / low-dust findings promptly if they do not explain the EBLL.
- Ask targeted questions about water source (well vs. municipal), imported spices/candy, glazed cookware, cosmetics, and caregiver occupations.
- Refer drinking-water sampling to the utility or a drinking-water specialist rather than improvising dust-wipe geometry on a faucet.
- Keep a clear boundary in the written report between identified LBP hazards and suspected non-LBP sources.
Take-Home Occupational Dust
Caregivers working in battery plants, radiator repair, firing ranges, bridge painting, or demolition can transport lead dust on clothes and shoes. Recommend:
- Work clothes changed/washed separately
- Shoes removed at the entry
- Entryway HEPA cleaning
- Employer industrial-hygiene follow-up when appropriate
These recommendations complement—not replace—control of any deteriorated LBP, dust-lead, or soil-lead hazards found on site.
Which statement correctly reflects 40 CFR 745.225(d)(2) risk-assessor curriculum expectations?
A child has an elevated blood lead level, but dust and soil results are non-detect and paint is intact. Which assessor response is most appropriate?
Why are drinking-water lead results not reported in µg/ft²?
During a risk assessment you observe active interior sanding with no containment in a pre-1978 unit. What is the best immediate characterization of the air/dust pathway?