How to Test for Lead Paint — Bothell, Washington
Complete checklist with climate-adjusted recommendations for Bothell, Washington
Overview
Required before any renovation in pre-1978 homes. Use EPA-approved test kits or hire a certified inspector.
Step-by-Step Guide
Determine if your home was built before 1978
Lead-based paint was banned for residential use in the United States in 1978. If your home was built before 1978, there is a significant probability it contains lead paint — 87% of homes built before 1940 and 24% of homes built between 1960-1977 have lead-based paint.
Identify surfaces most likely to contain lead paint
Focus on high-friction surfaces where paint wears: window sashes and frames, door frames, stair railings, porches, and exterior trim. Lead paint is also commonly found on walls, baseboards, and built-in cabinetry in pre-1978 homes.
Purchase an EPA-recognized home test kit
Buy an EPA-recognized lead test kit from a hardware store ($10-$30). As of 2024, two kits are EPA-recognized for DIY use: 3M LeadCheck swabs and the D-Lead paint test kit. Follow the instructions precisely — incorrect use produces false negatives.
Prepare the test area
Use a utility knife to cut through all layers of paint down to the bare substrate (wood, plaster, or drywall). Lead paint is often buried under multiple layers of newer paint. Make a small V-shaped cut that exposes every layer. Test each suspect area separately.
Perform the swab test
Activate the swab according to the kit instructions (typically crush the ampules inside). Rub the swab firmly in the cut for 30 seconds, ensuring it contacts all paint layers. Read the result: a red or pink color change indicates lead is present. A yellow result means no lead detected.
Document and label all test results
Number each test location and record the result on a floor plan or room diagram. Take photos of each test location and the swab result. Keep this documentation — you will need it for renovation planning, disclosure to buyers or tenants, and regulatory compliance.
Understand your options if lead is found
If lead paint is detected, you have three main options: encapsulation (painting over with an encapsulant sealant, $1-$4/sq ft), enclosure (covering with new drywall or siding), or abatement (full removal by a certified contractor, $8-$15/sq ft). Intact lead paint in good condition is not an immediate hazard, but it must be disclosed and managed.
Comply with EPA RRP Rule for renovations
If you plan to renovate a pre-1978 home, the EPA Renovation, Repair and Painting (RRP) Rule requires that the work be performed by an EPA-certified renovator. This applies to any work that disturbs more than 6 square feet of interior painted surface or 20 square feet of exterior painted surface.
What You'll Need
Tools
- - EPA-recognized lead test kit (3M LeadCheck or D-Lead)
- - Utility knife for exposing paint layers
- - Dust mask (N95 minimum) for cutting paint
- - Disposable gloves
- - Camera for documentation
Materials
- - Plastic sheeting to catch paint chips from test cuts
- - Wet wipes for cleanup
- - Sealable plastic bags for paint chip disposal
Cost Estimates
DIY Cost
$10 – $30 (EPA-recognized test kit)
Professional Cost
$300 – $500 (certified lead inspection); $3,000 – $15,000+ (professional abatement)
Safety Tips
- Never sand, scrape, or use a heat gun on suspected lead paint without proper containment — this creates hazardous lead dust.
- Wash hands thoroughly after handling paint chips or performing tests.
- Keep children and pets away from test areas. Children under 6 are most vulnerable to lead poisoning.
- If you suspect lead dust exposure, ask your doctor about a blood lead level test.
- Dispose of paint chips and used test materials in sealed plastic bags in the regular trash (small quantities).
When to Call a Professional
Hire an EPA-certified lead inspector or risk assessor ($300-$500) when: DIY test results are ambiguous, you need documentation for a real estate transaction, you are planning a renovation in a pre-1978 home, or a child has tested positive for elevated blood lead levels. For lead abatement, always use a state-certified lead abatement contractor.
Pro Tip
If you are selling a pre-1978 home, federal law (the Lead Disclosure Rule) requires you to disclose known lead paint hazards to buyers. Having documented test results, whether positive or negative, satisfies this requirement and builds buyer confidence.
Common Mistakes to Avoid
- Testing only the top layer of paint instead of cutting through all layers — lead paint is often buried under 5-10 coats of newer paint.
- Using test kits that are not EPA-recognized (many cheap kits have high false-negative rates).
- Assuming that painting over lead paint eliminates the hazard — regular paint is not an encapsulant and will eventually chip, re-exposing the lead surface.
- Hiring a non-certified contractor to renovate a pre-1978 home, which violates federal EPA RRP rules and can result in fines of up to $37,500 per day.
- Ignoring exterior lead paint, which weathers and contaminates surrounding soil where children play.
Local Professionals in Bothell
Bothell Housing Market
Median Home Price
$979,950
Homes for Sale
188
Price per Sq Ft
$502
Local Pros
560
Home Service Professionals Near Bothell
Median Household Income
$132,232
Median Home Value
$871,300
Median Rent
$2,295/mo
Homeownership Rate
63.2%
Population
48,610
Median Year Built
1992
Source: U.S. Census Bureau, ACS 2023 5-Year Estimates
Fair Market Rents — Bothell
Studio
$2,074/mo
1 Bedroom
$2,146/mo
2 Bedroom
$2,501/mo
3 Bedroom
$3,272/mo
4 Bedroom
$3,847/mo
Source: HUD FY2026 Fair Market Rents — Seattle-Bellevue, WA HUD Metro FMR Area