Environmental Compliance Inspector Water Quality Compliance Questions and Answers

Question 1

An inspector is reviewing a facility's National Pollutant Discharge Elimination System (NPDES) permit, which authorizes the discharge of treated wastewater into a river. The permit's discharge limits are primarily based on technology-based standards set by the EPA for that specific industrial category. What are these national, technology-based standards formally known as?

Accepted Answer

Effluent Limitation Guidelines (ELGs)

Answer

Effluent Limitation Guidelines (ELGs) are national, technology-based regulations developed by the EPA for specific industrial categories. [3, 9, 18] These guidelines establish the maximum allowable levels of pollutants that can be discharged from a facility into a body of water and are a primary component in setting the limits within an NPDES permit. [3, 9, 18] TMDLs are calculations for restoring impaired waters, WQS are state-level standards for water bodies, and SDWS apply to public drinking water, not wastewater discharge.

Question 2

A state environmental agency has identified a lake as 'impaired' because it does not meet water quality standards for phosphorus, even after all permitted point sources have installed required pollution control technology. Under the Clean Water Act, what must the state now develop for this lake?

Accepted Answer

A Total Maximum Daily Load (TMDL)

Answer

Section 303(d) of the Clean Water Act requires states to identify waters that are not meeting quality standards and are considered 'impaired.' [4, 6] For these impaired waters, the state must develop a Total Maximum Daily Load (TMDL). [4, 10] A TMDL is a calculation of the maximum amount of a pollutant (in this case, phosphorus) that a waterbody can receive and still meet water quality standards, serving as a plan to restore the waterbody. [14]

Question 3

Which federal law is primarily focused on protecting the quality of public drinking water supplies, including sources like rivers, lakes, and groundwater, by authorizing the EPA to set enforceable health standards for contaminants?

Accepted Answer

Safe Drinking Water Act (SDWA)

Answer

The Safe Drinking Water Act (SDWA), passed in 1974, is the main federal law that ensures the quality of America's drinking water. [11, 13, 21] It requires the EPA to establish and enforce standards for public water systems to protect public health from contaminants in drinking water. [11, 27] The Clean Water Act primarily regulates discharges into surface waters, not the quality of finished drinking water.

Question 4

An inspector is visiting a manufacturing plant that has stormwater runoff from its industrial activity areas, such as material storage yards and loading docks. This runoff flows through a ditch directly into a nearby creek. Under the Clean Water Act's NPDES program, what is this type of discharge most likely to require?

Accepted Answer

A stormwater discharge permit

Answer

Stormwater discharges associated with industrial activity that flow to surface waters are regulated under the NPDES program. [24, 31, 36] Facilities must obtain a stormwater discharge permit, which requires them to develop and implement a Stormwater Pollution Prevention Plan (SWPPP) to manage runoff and minimize pollutants. [2, 31] A No Exposure Certification is only possible if all industrial materials and activities are protected from contact with precipitation.

Question 5

During a review of a Publicly Owned Treatment Works (POTW), an inspector notes that a significant industrial user (SIU) is discharging pollutants that are interfering with the POTW's treatment process. Which component of the Clean Water Act specifically addresses the regulation of industrial discharges to municipal sewer systems?

Accepted Answer

The National Pretreatment Program

Answer

The National Pretreatment Program, a component of the NPDES program, controls pollutants from industrial users that are discharged to POTWs. [18] The program's goal is to prevent 'pass through' of pollutants that are not adequately treated by the POTW and to prevent 'interference' with the POTW's operations or sludge. [39] Indirect dischargers, like the SIU in this scenario, must comply with these pretreatment standards.

Environmental Compliance Inspector Practice Test

Environmental Compliance Inspector Practice Test

Environmental Compliance Inspector Water Quality Compliance Questions and Answers