Flood Restoration Contamination Categories and Water Classification

Question 1

What defines Category 1 water in the IICRC S500 standard?

Accepted Answer

Clean water from a sanitary source that poses no health risk

Answer

Water containing minor contaminants

Answer

Water from a broken toilet bowl

Answer

Groundwater from flooding

Question 2

Which of the following is an example of Category 2 (gray water) in flood restoration?

Accepted Answer

Overflow from a washing machine

Answer

Sewage backup from a main drain

Answer

Clean water from a broken pipe

Answer

Rainwater collected in a barrel

Question 3

What is the critical time threshold after which Category 1 water is considered to degrade to Category 2?

Accepted Answer

24-48 hours

Answer

72 hours

Answer

1 week

Answer

12 hours

Question 4

Which scenario always results in a Category 3 water classification regardless of the source?

Accepted Answer

Any water that has come in contact with sewage or seawater from storm surge

Answer

Any water that has been standing for more than 72 hours

Answer

Any water causing structural damage

Answer

Any water with visible debris

Question 5

What additional safety measures are required for Category 3 water restoration compared to Category 1?

Accepted Answer

Full PPE including respirators, disposal of porous materials, antimicrobial treatment, and enhanced containment

Answer

Only gloves and boots

Answer

Standard safety glasses and dust masks

Answer

No additional measures if water is removed quickly

Question 6

How should hardwood flooring be treated in a Category 3 flood event?

Accepted Answer

Remove and dispose of as contaminated material

Answer

Dry in place with air movers and antimicrobial

Answer

Clean with bleach and refinish

Answer

Sand and re-coat the surface