CWD Water Quality & Environmental Regulations 3

Question 1

What does the term 'wellhead protection area' (WHPA) refer to?

Accepted Answer

The surface and subsurface area surrounding a well that supplies water to the well

Answer

A WHPA is the surface and subsurface area through which contaminants are reasonably likely to move toward and reach a public water supply well.

Question 2

Which groundwater contaminant is measured in picocuries per liter (pCi/L) and originates from uranium decay in soil and rock?

Accepted Answer

Radon

Answer

Radon is a radioactive gas produced by uranium decay that dissolves into groundwater and is measured in picocuries per liter.

Question 3

What is the EPA's Maximum Contaminant Level (MCL) for nitrate in drinking water?

Accepted Answer

10 mg/L

Answer

The EPA MCL for nitrate is 10 mg/L as nitrogen (NO3-N) to protect infants from methemoglobinemia (blue baby syndrome).

Question 4

Which document must a well driller typically submit to the state after completing a well?

Accepted Answer

Well completion report (driller's log)

Answer

Most states require drillers to submit a well completion report or driller's log documenting construction details, geology, and water quality.

Question 5

A water sample shows total coliform present but E. coli absent. What is the correct interpretation?

Accepted Answer

The result is an indicator of possible contamination requiring follow-up testing

Answer

Total coliform presence without E. coli indicates possible contamination; a repeat sample and investigation are required before declaring the water safe.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Water Quality & Environmental Regulations 3