Hiring a crew: Wisconsin workers' comp and chemical rules

Two triggers for workers' compensation cover

Wisconsin requires workers' compensation insurance from an employer with three or more employees, or one that pays $500 or more in wages in a quarter.

Coverage must start on the day you employ the third person. Under the wage trigger it starts on the 10th day of the first month of the next quarter.

A seasonal pressure washing business can trip the second trigger with one part-time helper. Ask your insurer for a quote before the first payroll, not after.

3 employees or $500 per quarterInsurance is required when you employ three or more people, or pay gross wages of $500 or more in a quarter to one or more employees. — Wisconsin Department of Workforce Development, retrieved 2026-09-29

The cost of going without

An employer without required coverage faces a penalty of double the premium it should have paid, or $750, whichever is greater.

The state may add $100 a day for up to seven days, and it may order the business closed. If an employee is hurt, the owner can be personally liable for the benefits paid.

That last point matters most for a small owner. A ladder fall from a two-story house wash is exactly the injury this cover is written for.

$750 minimumUninsured employers face double the premium or $750 whichever is greater, up to $100 a day for seven days, and possible closure. — Wisconsin Department of Workforce Development, retrieved 2026-09-29

Subcontractors and the nine-part test

Calling a helper a subcontractor does not make one. Wisconsin uses a nine-part test, and a worker must meet all nine to be an independent contractor.

Among them, the worker keeps a separate business with its own equipment, holds or has applied for an EIN or files self-employment returns, and bears the main costs of the work. The worker is paid per job or by competitive bid, and can profit or lose on it.

A day laborer on your truck, paid by the hour with your washer, does not meet the test. Treat that person as an employee.

9 criteriaA worker must meet all nine criteria to be an independent contractor, including a separate business, per-job pay and the chance of profit or loss. — Wisconsin Department of Workforce Development, retrieved 2026-09-29

If an uninsured subcontractor is hurt and later found to be an employee, the hiring employer faces penalties and personal liability for benefits. — Wisconsin Department of Workforce Development, retrieved 2026-09-29

Training on chemicals and on the wash water plan

Federal law puts a chemical duty on the employer. All employers with hazardous chemicals in their workplaces must have labels and safety data sheets for exposed workers.

OSHA also requires employers to train workers on the label elements and the safety data sheet format. Your sodium hypochlorite, acid and degreaser all count, so keep the sheets in the truck.

If you hold DNR permit coverage, the plan adds its own training. The checklist and the permit page show what that training must cover.

OSHA says all employers with hazardous chemicals must have labels and safety data sheets for exposed workers and train workers on them. — OSHA, Hazard Communication standard, retrieved 2026-09-29

The permit requires an employee BMP training program on each employee's responsibilities and proper implementation of the BMPs. — Wisconsin DNR, Low-Impact Discharge general permit WI-0066575-01-0, retrieved 2026-09-29

Register as an employer and plan the order

Before the first payroll, get the EIN and register with the Department of Revenue. The employer registration certificate is one of the permits the $20 business tax registration covers.

Then put insurance, registration and training on one start-of-season list. Insurance first, since the wage trigger can start in your first quarter.

Owners forming a company should read the LLC page first, because an EIN and a business bank account usually come with the entity, and the registration guide covers the Department's side.

$20The $20 Wisconsin business tax registration covers employer registration certificates and seller's permits. — Wisconsin Department of Revenue, Business Tax Registration, retrieved 2026-09-29

Questions