CWD Water Quality & Environmental Regulations 2

Question 1

Under the Safe Drinking Water Act (SDWA), which agency sets National Primary Drinking Water Regulations?

Accepted Answer

EPA

Answer

The EPA establishes National Primary Drinking Water Regulations (NPDWRs) under the SDWA to protect public health.

Question 2

What does a Maximum Contaminant Level Goal (MCLG) represent?

Accepted Answer

The level at which no known adverse health effects occur

Answer

MCLGs are non-enforceable public health goals set at the level at which no known or anticipated adverse effects on health occur.

Question 3

Which test is typically performed first when assessing a new well for potable use?

Accepted Answer

Coliform bacteria test

Answer

Coliform bacteria testing is the standard initial indicator test for microbiological safety of a new potable well.

Question 4

A well is located 40 feet from a septic drain field. What is the primary regulatory concern?

Accepted Answer

Nitrate and pathogen contamination from sewage effluent

Answer

Setback distances from septic systems are required because sewage effluent can introduce nitrates, bacteria, and viruses into groundwater.

Question 5

Which naturally occurring contaminant is most commonly associated with granite bedrock aquifers and is a known carcinogen?

Accepted Answer

Arsenic

Answer

Arsenic naturally occurs in granite and other rock formations and is a Group 1 human carcinogen regulated under the SDWA.

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